rna_particle.c

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/*
 * $Id: rna_particle.c 37760 2011-06-23 18:59:47Z lukastoenne $
 *
 * ***** BEGIN GPL LICENSE BLOCK *****
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * Contributor(s): Blender Foundation (2008).
 *
 * ***** END GPL LICENSE BLOCK *****
 */

#include <stdio.h>
#include <stdlib.h>

#include "limits.h"

#include "RNA_define.h"

#include "rna_internal.h"

#include "DNA_material_types.h"
#include "DNA_meshdata_types.h"
#include "DNA_modifier_types.h"
#include "DNA_cloth_types.h"
#include "DNA_particle_types.h"
#include "DNA_object_force.h"
#include "DNA_object_types.h"
#include "DNA_scene_types.h"
#include "DNA_boid_types.h"
#include "DNA_texture_types.h"

#include "WM_types.h"
#include "WM_api.h"

EnumPropertyItem part_from_items[] = {
        {PART_FROM_VERT, "VERT", 0, "Verts", ""},
        {PART_FROM_FACE, "FACE", 0, "Faces", ""},
        {PART_FROM_VOLUME, "VOLUME", 0, "Volume", ""},
        {0, NULL, 0, NULL, NULL}
};

EnumPropertyItem part_reactor_from_items[] = {
        {PART_FROM_VERT, "VERT", 0, "Verts", ""},
        {PART_FROM_FACE, "FACE", 0, "Faces", ""},
        {PART_FROM_VOLUME, "VOLUME", 0, "Volume", ""},
        {0, NULL, 0, NULL, NULL}
};

EnumPropertyItem part_dist_items[] = {
        {PART_DISTR_JIT, "JIT", 0, "Jittered", ""},
        {PART_DISTR_RAND, "RAND", 0, "Random", ""},
        {PART_DISTR_GRID, "GRID", 0, "Grid", ""},
        {0, NULL, 0, NULL, NULL}
};

EnumPropertyItem part_hair_dist_items[] = {
        {PART_DISTR_JIT, "JIT", 0, "Jittered", ""},
        {PART_DISTR_RAND, "RAND", 0, "Random", ""},
        {0, NULL, 0, NULL, NULL}
};

EnumPropertyItem part_draw_as_items[] = {
        {PART_DRAW_NOT, "NONE", 0, "None", ""},
        {PART_DRAW_REND, "RENDER", 0, "Rendered", ""},
        {PART_DRAW_DOT, "DOT", 0, "Point", ""},
        {PART_DRAW_CIRC, "CIRC", 0, "Circle", ""},
        {PART_DRAW_CROSS, "CROSS", 0, "Cross", ""},
        {PART_DRAW_AXIS, "AXIS", 0, "Axis", ""},
        {0, NULL, 0, NULL, NULL}
};

EnumPropertyItem part_hair_draw_as_items[] = {
        {PART_DRAW_NOT, "NONE", 0, "None", ""},
        {PART_DRAW_REND, "RENDER", 0, "Rendered", ""},
        {PART_DRAW_PATH, "PATH", 0, "Path", ""},
        {0, NULL, 0, NULL, NULL}
};

EnumPropertyItem part_ren_as_items[] = {
        {PART_DRAW_NOT, "NONE", 0, "None", ""},
        {PART_DRAW_HALO, "HALO", 0, "Halo", ""},
        {PART_DRAW_LINE, "LINE", 0, "Line", ""},
        {PART_DRAW_PATH, "PATH", 0, "Path", ""},
        {PART_DRAW_OB, "OBJECT", 0, "Object", ""},
        {PART_DRAW_GR, "GROUP", 0, "Group", ""},
        {PART_DRAW_BB, "BILLBOARD", 0, "Billboard", ""},
        {0, NULL, 0, NULL, NULL}
};

EnumPropertyItem part_hair_ren_as_items[] = {
        {PART_DRAW_NOT, "NONE", 0, "None", ""},
        {PART_DRAW_PATH, "PATH", 0, "Path", ""},
        {PART_DRAW_OB, "OBJECT", 0, "Object", ""},
        {PART_DRAW_GR, "GROUP", 0, "Group", ""},
        {0, NULL, 0, NULL, NULL}
};

#ifdef RNA_RUNTIME

#include "BLI_math.h"
#include "BLI_listbase.h"

#include "BKE_context.h"
#include "BKE_cloth.h"
#include "BKE_deform.h"
#include "BKE_depsgraph.h"
#include "BKE_DerivedMesh.h"
#include "BKE_cdderivedmesh.h"
#include "BKE_effect.h"
#include "BKE_modifier.h"
#include "BKE_particle.h"
#include "BKE_pointcache.h"
#include "BKE_texture.h"

/* use for object space hair get/set */
static void rna_ParticleHairKey_location_object_info(PointerRNA *ptr, ParticleSystemModifierData **psmd_pt, ParticleData **pa_pt)
{
        HairKey *hkey= (HairKey *)ptr->data;
        Object *ob = (Object *)ptr->id.data;
        ModifierData *md;
        ParticleSystemModifierData *psmd=NULL;
        ParticleSystem *psys;
        ParticleData *pa;
        int i;

        *psmd_pt= NULL;
        *pa_pt= NULL;

        /* weak, what about multiple particle systems? */
        for (md = ob->modifiers.first; md; md=md->next) {
                if (md->type == eModifierType_ParticleSystem)
                        psmd= (ParticleSystemModifierData*) md;
        }

        if (!psmd || !psmd->dm || !psmd->psys) {
                return;
        }

        psys= psmd->psys;

        /* not a very efficient way of getting hair key location data,
         * but it's the best we've got at the present */

        /* find the particle that corresponds with this HairKey */
        for(i=0, pa=psys->particles; i<psys->totpart; i++, pa++) {

                /* hairkeys are stored sequentially in memory, so we can find if
                 * it's the same particle by comparing pointers, without having
                 * to iterate over them all */
                if ((hkey >= pa->hair) && (hkey < pa->hair + pa->totkey))
                        break;
        }

        *psmd_pt= psmd;
        *pa_pt= pa;
}

static void rna_ParticleHairKey_location_object_get(PointerRNA *ptr, float *values)
{
        HairKey *hkey= (HairKey *)ptr->data;
        Object *ob = (Object *)ptr->id.data;
        ParticleSystemModifierData *psmd;
        ParticleData *pa;

        rna_ParticleHairKey_location_object_info(ptr, &psmd, &pa);

        if(pa) {
                DerivedMesh *hairdm = (psmd->psys->flag & PSYS_HAIR_DYNAMICS) ? psmd->psys->hair_out_dm : NULL;

                if(hairdm) {
                        MVert *mvert = CDDM_get_vert(hairdm, pa->hair_index + (hkey - pa->hair));
                        copy_v3_v3(values, mvert->co);
                }
                else {
                        float hairmat[4][4];
                        psys_mat_hair_to_object(ob, psmd->dm, psmd->psys->part->from, pa, hairmat);
                        copy_v3_v3(values, hkey->co);
                        mul_m4_v3(hairmat, values);
                }
        }
        else {
                zero_v3(values);
        }
}

static void rna_ParticleHairKey_location_object_set(PointerRNA *ptr, const float *values)
{
        HairKey *hkey= (HairKey *)ptr->data;
        Object *ob = (Object *)ptr->id.data;
        ParticleSystemModifierData *psmd;
        ParticleData *pa;

        rna_ParticleHairKey_location_object_info(ptr, &psmd, &pa);

        if(pa) {
                DerivedMesh *hairdm = (psmd->psys->flag & PSYS_HAIR_DYNAMICS) ? psmd->psys->hair_out_dm : NULL;

                if(hairdm) {
                        MVert *mvert = CDDM_get_vert(hairdm, pa->hair_index + (hkey - pa->hair));
                        copy_v3_v3(mvert->co, values);
                }
                else {
                        float hairmat[4][4];
                        float imat[4][4];

                        psys_mat_hair_to_object(ob, psmd->dm, psmd->psys->part->from, pa, hairmat);
                        invert_m4_m4(imat, hairmat);
                        copy_v3_v3(hkey->co, values);
                        mul_m4_v3(imat, hkey->co);
                }
        }
        else {
                zero_v3(hkey->co);
        }
}

/* property update functions */
static void particle_recalc(Main *UNUSED(bmain), Scene *UNUSED(scene), PointerRNA *ptr, short flag)
{
        if(ptr->type==&RNA_ParticleSystem) {
                ParticleSystem *psys = (ParticleSystem*)ptr->data;
                
                psys->recalc = flag;

                DAG_id_tag_update(ptr->id.data, OB_RECALC_DATA);
        }
        else
                DAG_id_tag_update(ptr->id.data, OB_RECALC_DATA|flag);

        WM_main_add_notifier(NC_OBJECT|ND_PARTICLE|NA_EDITED, NULL);
}
static void rna_Particle_redo(Main *bmain, Scene *scene, PointerRNA *ptr)
{
        particle_recalc(bmain, scene, ptr, PSYS_RECALC_REDO);
}

static void rna_Particle_redo_dependency(Main *bmain, Scene *scene, PointerRNA *ptr)
{
        DAG_scene_sort(bmain, scene);
        rna_Particle_redo(bmain, scene, ptr);
}

static void rna_Particle_reset(Main *bmain, Scene *scene, PointerRNA *ptr)
{
        particle_recalc(bmain, scene, ptr, PSYS_RECALC_RESET);
}

static void rna_Particle_change_type(Main *bmain, Scene *scene, PointerRNA *ptr)
{
        particle_recalc(bmain, scene, ptr, PSYS_RECALC_RESET|PSYS_RECALC_TYPE);
}

static void rna_Particle_change_physics(Main *bmain, Scene *scene, PointerRNA *ptr)
{
        particle_recalc(bmain, scene, ptr, PSYS_RECALC_RESET|PSYS_RECALC_PHYS);
}

static void rna_Particle_redo_child(Main *bmain, Scene *scene, PointerRNA *ptr)
{
        particle_recalc(bmain, scene, ptr, PSYS_RECALC_CHILD);
}

static ParticleSystem *rna_particle_system_for_target(Object *ob, ParticleTarget *target)
{
        ParticleSystem *psys;
        ParticleTarget *pt;

        for(psys=ob->particlesystem.first; psys; psys=psys->next)
                for(pt=psys->targets.first; pt; pt=pt->next)
                        if(pt == target)
                                return psys;
        
        return NULL;
}

static void rna_Particle_target_reset(Main *bmain, Scene *scene, PointerRNA *ptr)
{
        if(ptr->type==&RNA_ParticleTarget) {
                Object *ob = (Object*)ptr->id.data;
                ParticleTarget *pt = (ParticleTarget*)ptr->data;
                ParticleSystem *kpsys=NULL, *psys=rna_particle_system_for_target(ob, pt);

                if(pt->ob==ob || pt->ob==NULL) {
                        kpsys = BLI_findlink(&ob->particlesystem, pt->psys-1);

                        if(kpsys)
                                pt->flag |= PTARGET_VALID;
                        else
                                pt->flag &= ~PTARGET_VALID;
                }
                else {
                        if(pt->ob)
                                kpsys = BLI_findlink(&pt->ob->particlesystem, pt->psys-1);

                        if(kpsys)
                                pt->flag |= PTARGET_VALID;
                        else
                                pt->flag &= ~PTARGET_VALID;
                }
                
                psys->recalc = PSYS_RECALC_RESET;

                DAG_id_tag_update(&ob->id, OB_RECALC_DATA);
                DAG_scene_sort(bmain, scene);
        }

        WM_main_add_notifier(NC_OBJECT|ND_PARTICLE|NA_EDITED, NULL);
}

static void rna_Particle_target_redo(Main *UNUSED(bmain), Scene *UNUSED(scene), PointerRNA *ptr)
{
        if(ptr->type==&RNA_ParticleTarget) {
                Object *ob = (Object*)ptr->id.data;
                ParticleTarget *pt = (ParticleTarget*)ptr->data;
                ParticleSystem *psys = rna_particle_system_for_target(ob, pt);
                
                psys->recalc = PSYS_RECALC_REDO;

                DAG_id_tag_update(&ob->id, OB_RECALC_DATA);
                WM_main_add_notifier(NC_OBJECT|ND_PARTICLE|NA_EDITED, NULL);
        }
}

static void rna_Particle_hair_dynamics(Main *bmain, Scene *scene, PointerRNA *ptr)
{
        Object *ob = (Object*)ptr->id.data;
        ParticleSystem *psys = (ParticleSystem*)ptr->data;
        
        if(psys && !psys->clmd) {
                psys->clmd = (ClothModifierData*)modifier_new(eModifierType_Cloth);
                psys->clmd->sim_parms->goalspring = 0.0f;
                psys->clmd->sim_parms->flags |= CLOTH_SIMSETTINGS_FLAG_GOAL|CLOTH_SIMSETTINGS_FLAG_NO_SPRING_COMPRESS;
                psys->clmd->coll_parms->flags &= ~CLOTH_COLLSETTINGS_FLAG_SELF;
                rna_Particle_redo(bmain, scene, ptr);
        }
        else
                WM_main_add_notifier(NC_OBJECT|ND_PARTICLE|NA_EDITED, NULL);

        DAG_id_tag_update(&ob->id, OB_RECALC_DATA);
}
static PointerRNA rna_particle_settings_get(PointerRNA *ptr)
{
        ParticleSystem *psys= (ParticleSystem*)ptr->data;
        ParticleSettings *part = psys->part;

        return rna_pointer_inherit_refine(ptr, &RNA_ParticleSettings, part);
}

static void rna_particle_settings_set(PointerRNA *ptr, PointerRNA value)
{
        ParticleSystem *psys= (ParticleSystem*)ptr->data;
        int old_type = 0;


        if(psys->part) {
                old_type = psys->part->type;
                psys->part->id.us--;
        }

        psys->part = (ParticleSettings *)value.data;

        if(psys->part) {
                psys->part->id.us++;
                psys_check_boid_data(psys);
                if(old_type != psys->part->type)
                        psys->recalc |= PSYS_RECALC_TYPE;
        }
}
static void rna_Particle_abspathtime_update(Main *bmain, Scene *scene, PointerRNA *ptr)
{
        ParticleSettings *settings = (ParticleSettings*)ptr->data;
        float delta = settings->end + settings->lifetime - settings->sta;
        if(settings->draw & PART_ABS_PATH_TIME) {
                settings->path_start = settings->sta + settings->path_start * delta;
                settings->path_end = settings->sta + settings->path_end * delta;
        }
        else {
                settings->path_start = (settings->path_start - settings->sta)/delta;
                settings->path_end = (settings->path_end - settings->sta)/delta;
        }
        rna_Particle_redo(bmain, scene, ptr);
}
static void rna_PartSettings_start_set(struct PointerRNA *ptr, float value)
{
        ParticleSettings *settings = (ParticleSettings*)ptr->data;

        /* check for clipping */
        if(value > settings->end)
                value = settings->end;

        //if(settings->type==PART_REACTOR && value < 1.0)
        //      value = 1.0;
        //else 
        if (value < MINAFRAMEF)
                value = MINAFRAMEF;

        settings->sta = value;
}

static void rna_PartSettings_end_set(struct PointerRNA *ptr, float value)
{
        ParticleSettings *settings = (ParticleSettings*)ptr->data;

        /* check for clipping */
        if(value < settings->sta)
                value = settings->sta;

        settings->end = value;
}

static void rna_PartSetings_timestep_set(struct PointerRNA *ptr, float value)
{
        ParticleSettings *settings = (ParticleSettings*)ptr->data;

        settings->timetweak = value/0.04f;
}

static float rna_PartSettings_timestep_get(struct PointerRNA *ptr)
{
        ParticleSettings *settings = (ParticleSettings*)ptr->data;

        return settings->timetweak * 0.04f;
}

static void rna_PartSetting_hairlength_set(struct PointerRNA *ptr, float value)
{
        ParticleSettings *settings = (ParticleSettings*)ptr->data;
        settings->normfac = value / 4.f;
}

static float rna_PartSetting_hairlength_get(struct PointerRNA *ptr)
{
        ParticleSettings *settings = (ParticleSettings*)ptr->data;
        return settings->normfac * 4.f;
}

static void rna_PartSetting_linelentail_set(struct PointerRNA *ptr, float value)
{
        ParticleSettings *settings = (ParticleSettings*)ptr->data;
        settings->draw_line[0] = value;
}

static float rna_PartSetting_linelentail_get(struct PointerRNA *ptr)
{
        ParticleSettings *settings = (ParticleSettings*)ptr->data;
        return settings->draw_line[0];
}
static void rna_PartSetting_pathstartend_range(PointerRNA *ptr, float *min, float *max)
{
        ParticleSettings *settings = (ParticleSettings*)ptr->data;

        if(settings->type==PART_HAIR) {
                *min = 0.0f;
                *max = (settings->draw & PART_ABS_PATH_TIME) ? 100.0f : 1.0f;
        }
        else {
                *min = (settings->draw & PART_ABS_PATH_TIME) ? settings->sta : 0.0f;
                *max= (settings->draw & PART_ABS_PATH_TIME) ? MAXFRAMEF : 1.0f;
        }
}
static void rna_PartSetting_linelenhead_set(struct PointerRNA *ptr, float value)
{
        ParticleSettings *settings = (ParticleSettings*)ptr->data;
        settings->draw_line[1] = value;
}

static float rna_PartSetting_linelenhead_get(struct PointerRNA *ptr)
{
        ParticleSettings *settings = (ParticleSettings*)ptr->data;
        return settings->draw_line[1];
}


static int rna_PartSettings_is_fluid_get(PointerRNA *ptr)
{
        ParticleSettings *part= (ParticleSettings*)ptr->data;

        return part->type == PART_FLUID;
}

static PointerRNA rna_ParticleSystem_active_particle_target_get(PointerRNA *ptr)
{
        ParticleSystem *psys= (ParticleSystem*)ptr->data;
        ParticleTarget *pt = psys->targets.first;

        for(; pt; pt=pt->next) {
                if(pt->flag & PTARGET_CURRENT)
                        return rna_pointer_inherit_refine(ptr, &RNA_ParticleTarget, pt);
        }
        return rna_pointer_inherit_refine(ptr, &RNA_ParticleTarget, NULL);
}
static void rna_ParticleSystem_active_particle_target_index_range(PointerRNA *ptr, int *min, int *max)
{
        ParticleSystem *psys= (ParticleSystem*)ptr->data;
        *min= 0;
        *max= BLI_countlist(&psys->targets)-1;
        *max= MAX2(0, *max);
}

static int rna_ParticleSystem_active_particle_target_index_get(PointerRNA *ptr)
{
        ParticleSystem *psys= (ParticleSystem*)ptr->data;
        ParticleTarget *pt = psys->targets.first;
        int i=0;

        for(; pt; pt=pt->next, i++)
                if(pt->flag & PTARGET_CURRENT)
                        return i;

        return 0;
}

static void rna_ParticleSystem_active_particle_target_index_set(struct PointerRNA *ptr, int value)
{
        ParticleSystem *psys= (ParticleSystem*)ptr->data;
        ParticleTarget *pt = psys->targets.first;
        int i=0;

        for(; pt; pt=pt->next, i++) {
                if(i==value)
                        pt->flag |= PTARGET_CURRENT;
                else
                        pt->flag &= ~PTARGET_CURRENT;
        }
}
static int rna_ParticleTarget_name_length(PointerRNA *ptr)
{
        ParticleTarget *pt= ptr->data;

        if(pt->flag & PTARGET_VALID) {
                ParticleSystem *psys = NULL;

                if(pt->ob)
                        psys = BLI_findlink(&pt->ob->particlesystem, pt->psys-1);
                else {
                        Object *ob = (Object*) ptr->id.data;
                        psys = BLI_findlink(&ob->particlesystem, pt->psys-1);
                }
                
                if(psys) {
                        if(pt->ob)
                                return strlen(pt->ob->id.name+2) + 2 + strlen(psys->name);
                        else
                                return strlen(psys->name);
                }
                else
                        return 15;
        }
        else
                return 15;
}

static void rna_ParticleTarget_name_get(PointerRNA *ptr, char *str)
{
        ParticleTarget *pt= ptr->data;

        if(pt->flag & PTARGET_VALID) {
                ParticleSystem *psys = NULL;

                if(pt->ob)
                        psys = BLI_findlink(&pt->ob->particlesystem, pt->psys-1);
                else {
                        Object *ob = (Object*) ptr->id.data;
                        psys = BLI_findlink(&ob->particlesystem, pt->psys-1);
                }
                
                if(psys) {
                        if(pt->ob)
                                sprintf(str, "%s: %s", pt->ob->id.name+2, psys->name);
                        else
                                strcpy(str, psys->name);
                }
                else
                        strcpy(str, "Invalid target!");
        }
        else
                strcpy(str, "Invalid target!");
}

static int particle_id_check(PointerRNA *ptr)
{
        ID *id= ptr->id.data;

        return (GS(id->name) == ID_PA);
}

static char *rna_SPHFluidSettings_path(PointerRNA *ptr)
{
        SPHFluidSettings *fluid = (SPHFluidSettings *)ptr->data;
        
        if(particle_id_check(ptr)) {
                ParticleSettings *part = (ParticleSettings*)ptr->id.data;
                
                if (part->fluid == fluid)
                        return BLI_sprintfN("fluid");
        }
        return NULL;
}

static int rna_ParticleSystem_multiple_caches_get(PointerRNA *ptr)
{
        ParticleSystem *psys= (ParticleSystem*)ptr->data;

        return (psys->ptcaches.first != psys->ptcaches.last);
}
static int rna_ParticleSystem_editable_get(PointerRNA *ptr)
{
        ParticleSystem *psys= (ParticleSystem*)ptr->data;

        return psys_check_edited(psys);
}
static int rna_ParticleSystem_edited_get(PointerRNA *ptr)
{
        ParticleSystem *psys= (ParticleSystem*)ptr->data;

        if(psys->part && psys->part->type==PART_HAIR)
                return (psys->flag & PSYS_EDITED || (psys->edit && psys->edit->edited));
        else
                return (psys->pointcache->edit && psys->pointcache->edit->edited);
}
static PointerRNA rna_ParticleDupliWeight_active_get(PointerRNA *ptr)
{
        ParticleSettings *part= (ParticleSettings*)ptr->id.data;
        ParticleDupliWeight *dw = part->dupliweights.first;

        for(; dw; dw=dw->next) {
                if(dw->flag & PART_DUPLIW_CURRENT)
                        return rna_pointer_inherit_refine(ptr, &RNA_ParticleDupliWeight, dw);
        }
        return rna_pointer_inherit_refine(ptr, &RNA_ParticleTarget, NULL);
}
static void rna_ParticleDupliWeight_active_index_range(PointerRNA *ptr, int *min, int *max)
{
        ParticleSettings *part= (ParticleSettings*)ptr->id.data;
        *min= 0;
        *max= BLI_countlist(&part->dupliweights)-1;
        *max= MAX2(0, *max);
}

static int rna_ParticleDupliWeight_active_index_get(PointerRNA *ptr)
{
        ParticleSettings *part= (ParticleSettings*)ptr->id.data;
        ParticleDupliWeight *dw = part->dupliweights.first;
        int i=0;

        for(; dw; dw=dw->next, i++)
                if(dw->flag & PART_DUPLIW_CURRENT)
                        return i;

        return 0;
}

static void rna_ParticleDupliWeight_active_index_set(struct PointerRNA *ptr, int value)
{
        ParticleSettings *part= (ParticleSettings*)ptr->id.data;
        ParticleDupliWeight *dw = part->dupliweights.first;
        int i=0;

        for(; dw; dw=dw->next, i++) {
                if(i==value)
                        dw->flag |= PART_DUPLIW_CURRENT;
                else
                        dw->flag &= ~PART_DUPLIW_CURRENT;
        }
}

static int rna_ParticleDupliWeight_name_length(PointerRNA *ptr)
{
        ParticleDupliWeight *dw= ptr->data;

        if(dw->ob)
                return strlen(dw->ob->id.name+2) + 7;
        else
                return 9 + 7;
}

static void rna_ParticleDupliWeight_name_get(PointerRNA *ptr, char *str)
{
        ParticleDupliWeight *dw= ptr->data;

        if(dw->ob)
                sprintf(str, "%s: %i", dw->ob->id.name+2, dw->count);
        else
                strcpy(str, "No object");
}

static EnumPropertyItem *rna_Particle_from_itemf(bContext *UNUSED(C), PointerRNA *UNUSED(ptr), PropertyRNA *UNUSED(prop), int *UNUSED(free))
{
        //if(part->type==PART_REACTOR)
        //      return part_reactor_from_items;
        //else
                return part_from_items;
}

static EnumPropertyItem *rna_Particle_dist_itemf(bContext *UNUSED(C), PointerRNA *ptr, PropertyRNA *UNUSED(prop), int *UNUSED(free))
{
        ParticleSettings *part = ptr->id.data;

        if(part->type==PART_HAIR)
                return part_hair_dist_items;
        else
                return part_dist_items;
}

static EnumPropertyItem *rna_Particle_draw_as_itemf(bContext *UNUSED(C), PointerRNA *ptr, PropertyRNA *UNUSED(prop), int *UNUSED(free))
{
        ParticleSettings *part = ptr->id.data;

        if(part->type==PART_HAIR)
                return part_hair_draw_as_items;
        else
                return part_draw_as_items;
}

static EnumPropertyItem *rna_Particle_ren_as_itemf(bContext *UNUSED(C), PointerRNA *ptr, PropertyRNA *UNUSED(prop), int *UNUSED(free))
{
        ParticleSettings *part = ptr->id.data;

        if(part->type==PART_HAIR)
                return part_hair_ren_as_items;
        else
                return part_ren_as_items;
}

static PointerRNA rna_Particle_field1_get(PointerRNA *ptr)
{
        ParticleSettings *part= (ParticleSettings*)ptr->id.data;

        /* weak */
        if(!part->pd)
                part->pd= object_add_collision_fields(0);
        
        return rna_pointer_inherit_refine(ptr, &RNA_FieldSettings, part->pd);
}

static PointerRNA rna_Particle_field2_get(PointerRNA *ptr)
{
        ParticleSettings *part= (ParticleSettings*)ptr->id.data;

        /* weak */
        if(!part->pd2)
                part->pd2= object_add_collision_fields(0);
        
        return rna_pointer_inherit_refine(ptr, &RNA_FieldSettings, part->pd2);
}

static void psys_vg_name_get__internal(PointerRNA *ptr, char *value, int index)
{
        Object *ob= ptr->id.data;
        ParticleSystem *psys= (ParticleSystem*)ptr->data;

        if(psys->vgroup[index] > 0) {
                bDeformGroup *defGroup= BLI_findlink(&ob->defbase, psys->vgroup[index]-1);

                if(defGroup) {
                        strcpy(value, defGroup->name);
                        return;
                }
        }

        value[0]= '\0';
}
static int psys_vg_name_len__internal(PointerRNA *ptr, int index)
{
        Object *ob= ptr->id.data;
        ParticleSystem *psys= (ParticleSystem*)ptr->data;

        if(psys->vgroup[index] > 0) {
                bDeformGroup *defGroup= BLI_findlink(&ob->defbase, psys->vgroup[index]-1);

                if(defGroup) {
                        return strlen(defGroup->name);
                }
        }
        return 0;
}
static void psys_vg_name_set__internal(PointerRNA *ptr, const char *value, int index)
{
        Object *ob= ptr->id.data;
        ParticleSystem *psys= (ParticleSystem*)ptr->data;

        if(value[0]=='\0') {
                psys->vgroup[index]= 0;
        }
        else {
                int vgroup_num = defgroup_name_index(ob, (char*)value);

                if(vgroup_num == -1)
                        return;

                psys->vgroup[index]= vgroup_num + 1;
        }
}

static char *rna_ParticleSystem_path(PointerRNA *ptr)
{
        ParticleSystem *psys= (ParticleSystem*)ptr->data;
        return BLI_sprintfN("particle_systems[\"%s\"]", psys->name);
}

static void rna_ParticleSettings_mtex_begin(CollectionPropertyIterator *iter, PointerRNA *ptr)
{
        ParticleSettings *part= (ParticleSettings*)ptr->data;
        rna_iterator_array_begin(iter, (void*)part->mtex, sizeof(MTex*), MAX_MTEX, 0, NULL);
}

static PointerRNA rna_ParticleSettings_active_texture_get(PointerRNA *ptr)
{
        ParticleSettings *part= (ParticleSettings*)ptr->data;
        Tex *tex;

        tex= give_current_particle_texture(part);
        return rna_pointer_inherit_refine(ptr, &RNA_Texture, tex);
}

static void rna_ParticleSettings_active_texture_set(PointerRNA *ptr, PointerRNA value)
{
        ParticleSettings *part= (ParticleSettings*)ptr->data;

        set_current_particle_texture(part, value.data);
}

/* irritating string functions for each index :/ */
static void rna_ParticleVGroup_name_get_0(PointerRNA *ptr, char *value) { psys_vg_name_get__internal(ptr, value, 0); }
static void rna_ParticleVGroup_name_get_1(PointerRNA *ptr, char *value) { psys_vg_name_get__internal(ptr, value, 1); }
static void rna_ParticleVGroup_name_get_2(PointerRNA *ptr, char *value) { psys_vg_name_get__internal(ptr, value, 2); }
static void rna_ParticleVGroup_name_get_3(PointerRNA *ptr, char *value) { psys_vg_name_get__internal(ptr, value, 3); }
static void rna_ParticleVGroup_name_get_4(PointerRNA *ptr, char *value) { psys_vg_name_get__internal(ptr, value, 4); }
static void rna_ParticleVGroup_name_get_5(PointerRNA *ptr, char *value) { psys_vg_name_get__internal(ptr, value, 5); }
static void rna_ParticleVGroup_name_get_6(PointerRNA *ptr, char *value) { psys_vg_name_get__internal(ptr, value, 6); }
static void rna_ParticleVGroup_name_get_7(PointerRNA *ptr, char *value) { psys_vg_name_get__internal(ptr, value, 7); }
static void rna_ParticleVGroup_name_get_8(PointerRNA *ptr, char *value) { psys_vg_name_get__internal(ptr, value, 8); }
static void rna_ParticleVGroup_name_get_9(PointerRNA *ptr, char *value) { psys_vg_name_get__internal(ptr, value, 9); }
static void rna_ParticleVGroup_name_get_10(PointerRNA *ptr, char *value) { psys_vg_name_get__internal(ptr, value, 10); }
static void rna_ParticleVGroup_name_get_11(PointerRNA *ptr, char *value) { psys_vg_name_get__internal(ptr, value, 11); }

static int rna_ParticleVGroup_name_len_0(PointerRNA *ptr) { return psys_vg_name_len__internal(ptr, 0); }
static int rna_ParticleVGroup_name_len_1(PointerRNA *ptr) { return psys_vg_name_len__internal(ptr, 1); }
static int rna_ParticleVGroup_name_len_2(PointerRNA *ptr) { return psys_vg_name_len__internal(ptr, 2); }
static int rna_ParticleVGroup_name_len_3(PointerRNA *ptr) { return psys_vg_name_len__internal(ptr, 3); }
static int rna_ParticleVGroup_name_len_4(PointerRNA *ptr) { return psys_vg_name_len__internal(ptr, 4); }
static int rna_ParticleVGroup_name_len_5(PointerRNA *ptr) { return psys_vg_name_len__internal(ptr, 5); }
static int rna_ParticleVGroup_name_len_6(PointerRNA *ptr) { return psys_vg_name_len__internal(ptr, 6); }
static int rna_ParticleVGroup_name_len_7(PointerRNA *ptr) { return psys_vg_name_len__internal(ptr, 7); }
static int rna_ParticleVGroup_name_len_8(PointerRNA *ptr) { return psys_vg_name_len__internal(ptr, 8); }
static int rna_ParticleVGroup_name_len_9(PointerRNA *ptr) { return psys_vg_name_len__internal(ptr, 9); }
static int rna_ParticleVGroup_name_len_10(PointerRNA *ptr) { return psys_vg_name_len__internal(ptr, 10); }
static int rna_ParticleVGroup_name_len_11(PointerRNA *ptr) { return psys_vg_name_len__internal(ptr, 11); }

static void rna_ParticleVGroup_name_set_0(PointerRNA *ptr, const char *value) { psys_vg_name_set__internal(ptr, value, 0); }
static void rna_ParticleVGroup_name_set_1(PointerRNA *ptr, const char *value) { psys_vg_name_set__internal(ptr, value, 1); }
static void rna_ParticleVGroup_name_set_2(PointerRNA *ptr, const char *value) { psys_vg_name_set__internal(ptr, value, 2); }
static void rna_ParticleVGroup_name_set_3(PointerRNA *ptr, const char *value) { psys_vg_name_set__internal(ptr, value, 3); }
static void rna_ParticleVGroup_name_set_4(PointerRNA *ptr, const char *value) { psys_vg_name_set__internal(ptr, value, 4); }
static void rna_ParticleVGroup_name_set_5(PointerRNA *ptr, const char *value) { psys_vg_name_set__internal(ptr, value, 5); }
static void rna_ParticleVGroup_name_set_6(PointerRNA *ptr, const char *value) { psys_vg_name_set__internal(ptr, value, 6); }
static void rna_ParticleVGroup_name_set_7(PointerRNA *ptr, const char *value) { psys_vg_name_set__internal(ptr, value, 7); }
static void rna_ParticleVGroup_name_set_8(PointerRNA *ptr, const char *value) { psys_vg_name_set__internal(ptr, value, 8); }
static void rna_ParticleVGroup_name_set_9(PointerRNA *ptr, const char *value) { psys_vg_name_set__internal(ptr, value, 9); }
static void rna_ParticleVGroup_name_set_10(PointerRNA *ptr, const char *value) { psys_vg_name_set__internal(ptr, value, 10); }
static void rna_ParticleVGroup_name_set_11(PointerRNA *ptr, const char *value) { psys_vg_name_set__internal(ptr, value, 11); }


#else

static void rna_def_particle_hair_key(BlenderRNA *brna)
{
        StructRNA *srna;
        PropertyRNA *prop;

        srna = RNA_def_struct(brna, "ParticleHairKey", NULL);
        RNA_def_struct_sdna(srna, "HairKey");
        RNA_def_struct_ui_text(srna, "Particle Hair Key", "Particle key for hair particle system");

        prop= RNA_def_property(srna, "time", PROP_FLOAT, PROP_UNSIGNED);
        RNA_def_property_ui_text(prop, "Time", "Relative time of key over hair length");

        prop= RNA_def_property(srna, "weight", PROP_FLOAT, PROP_UNSIGNED);
        RNA_def_property_range(prop, 0.0, 1.0);
        RNA_def_property_ui_text(prop, "Weight", "Weight for cloth simulation");

        prop= RNA_def_property(srna, "co", PROP_FLOAT, PROP_TRANSLATION);
        RNA_def_property_array(prop, 3);
        RNA_def_property_ui_text(prop, "Location (Object Space)", "Location of the hair key in object space");
        RNA_def_property_float_funcs(prop, "rna_ParticleHairKey_location_object_get", "rna_ParticleHairKey_location_object_set", NULL);
        
        prop= RNA_def_property(srna, "co_hair_space", PROP_FLOAT, PROP_TRANSLATION);
        RNA_def_property_float_sdna(prop, NULL, "co");
        RNA_def_property_ui_text(prop, "Location", "Location of the hair key in its internal coordinate system, relative to the emitting face");
}

static void rna_def_particle_key(BlenderRNA *brna)
{
        StructRNA *srna;
        PropertyRNA *prop;

        srna = RNA_def_struct(brna, "ParticleKey", NULL);
        RNA_def_struct_ui_text(srna, "Particle Key", "Key location for a particle over time");

        prop= RNA_def_property(srna, "location", PROP_FLOAT, PROP_TRANSLATION);
        RNA_def_property_float_sdna(prop, NULL, "co");
        RNA_def_property_ui_text(prop, "Location", "Key location");

        prop= RNA_def_property(srna, "velocity", PROP_FLOAT, PROP_VELOCITY);
        RNA_def_property_float_sdna(prop, NULL, "vel");
        RNA_def_property_ui_text(prop, "Velocity", "Key velocity");

        prop= RNA_def_property(srna, "rotation", PROP_FLOAT, PROP_QUATERNION);
        RNA_def_property_float_sdna(prop, NULL, "rot");
        RNA_def_property_ui_text(prop, "Rotation", "Key rotation quaternion");

        prop= RNA_def_property(srna, "angular_velocity", PROP_FLOAT, PROP_VELOCITY);
        RNA_def_property_float_sdna(prop, NULL, "ave");
        RNA_def_property_ui_text(prop, "Angular Velocity", "Key angular velocity");

        prop= RNA_def_property(srna, "time", PROP_FLOAT, PROP_UNSIGNED);
        RNA_def_property_ui_text(prop, "Time", "Time of key over the simulation");
}

static void rna_def_child_particle(BlenderRNA *brna)
{
        StructRNA *srna;
        //PropertyRNA *prop;

        srna = RNA_def_struct(brna, "ChildParticle", NULL);
        RNA_def_struct_ui_text(srna, "Child Particle", "Child particle interpolated from simulated or edited particles");

//      int num, parent;        /* num is face index on the final derived mesh */

//      int pa[4];                      /* nearest particles to the child, used for the interpolation */
//      float w[4];                     /* interpolation weights for the above particles */
//      float fuv[4], foffset; /* face vertex weights and offset */
//      float rand[3];
}

static void rna_def_particle(BlenderRNA *brna)
{
        StructRNA *srna;
        PropertyRNA *prop;

        static EnumPropertyItem alive_items[] = {
                //{PARS_KILLED, "KILLED", 0, "Killed", ""},
                {PARS_DEAD, "DEAD", 0, "Dead", ""},
                {PARS_UNBORN, "UNBORN", 0, "Unborn", ""},
                {PARS_ALIVE, "ALIVE", 0, "Alive", ""},
                {PARS_DYING, "DYING", 0, "Dying", ""},
                {0, NULL, 0, NULL, NULL}
        };

        srna = RNA_def_struct(brna, "Particle", NULL);
        RNA_def_struct_sdna(srna, "ParticleData");
        RNA_def_struct_ui_text(srna, "Particle", "Particle in a particle system");

        /* Particle State & Previous State */
        prop= RNA_def_property(srna, "location", PROP_FLOAT, PROP_TRANSLATION);
        RNA_def_property_float_sdna(prop, NULL, "state.co");
        RNA_def_property_ui_text(prop, "Particle Location", "");

        prop= RNA_def_property(srna, "velocity", PROP_FLOAT, PROP_VELOCITY);
        RNA_def_property_float_sdna(prop, NULL, "state.vel");
        RNA_def_property_ui_text(prop, "Particle Velocity", "");

        prop= RNA_def_property(srna, "angular_velocity", PROP_FLOAT, PROP_VELOCITY);
        RNA_def_property_float_sdna(prop, NULL, "state.ave");
        RNA_def_property_ui_text(prop, "Angular Velocity", "");

        prop= RNA_def_property(srna, "rotation", PROP_FLOAT, PROP_QUATERNION);
        RNA_def_property_float_sdna(prop, NULL, "state.rot");
        RNA_def_property_ui_text(prop, "Rotation", "");

        prop= RNA_def_property(srna, "prev_location", PROP_FLOAT, PROP_TRANSLATION);
        RNA_def_property_float_sdna(prop, NULL, "prev_state.co");
        RNA_def_property_ui_text(prop, "Previous Particle Location", "");

        prop= RNA_def_property(srna, "prev_velocity", PROP_FLOAT, PROP_VELOCITY);
        RNA_def_property_float_sdna(prop, NULL, "prev_state.vel");
        RNA_def_property_ui_text(prop, "Previous Particle Velocity", "");

        prop= RNA_def_property(srna, "prev_angular_velocity", PROP_FLOAT, PROP_VELOCITY);
        RNA_def_property_float_sdna(prop, NULL, "prev_state.ave");
        RNA_def_property_ui_text(prop, "Previous Angular Velocity", "");

        prop= RNA_def_property(srna, "prev_rotation", PROP_FLOAT, PROP_QUATERNION);
        RNA_def_property_float_sdna(prop, NULL, "prev_state.rot");
        RNA_def_property_ui_text(prop, "Previous Rotation", "");

        /* Hair & Keyed Keys */

        prop= RNA_def_property(srna, "hair_keys", PROP_COLLECTION, PROP_NONE);
        RNA_def_property_collection_sdna(prop, NULL, "hair", "totkey");
        RNA_def_property_struct_type(prop, "ParticleHairKey");
        RNA_def_property_ui_text(prop, "Hair", "");

        prop= RNA_def_property(srna, "particle_keys", PROP_COLLECTION, PROP_NONE);
        RNA_def_property_collection_sdna(prop, NULL, "keys", "totkey");
        RNA_def_property_struct_type(prop, "ParticleKey");
        RNA_def_property_ui_text(prop, "Keyed States", "");
//
//      float fuv[4], foffset;  /* coordinates on face/edge number "num" and depth along*/
//                                                      /* face normal for volume emission                                              */

        prop= RNA_def_property(srna, "birth_time", PROP_FLOAT, PROP_TIME);
        RNA_def_property_float_sdna(prop, NULL, "time");
//      RNA_def_property_range(prop, lowerLimitf, upperLimitf);
        RNA_def_property_ui_text(prop, "Birth Time", "");

        prop= RNA_def_property(srna, "lifetime", PROP_FLOAT, PROP_TIME);
//      RNA_def_property_range(prop, lowerLimitf, upperLimitf);
        RNA_def_property_ui_text(prop, "Lifetime", "");

        prop= RNA_def_property(srna, "die_time", PROP_FLOAT, PROP_TIME);
        RNA_def_property_float_sdna(prop, NULL, "dietime");
//      RNA_def_property_range(prop, lowerLimitf, upperLimitf);
        RNA_def_property_ui_text(prop, "Die Time", "");

        prop= RNA_def_property(srna, "size", PROP_FLOAT, PROP_NONE);
//      RNA_def_property_range(prop, lowerLimitf, upperLimitf);
        RNA_def_property_ui_text(prop, "Size", "");

//
//      int num;                                /* index to vert/edge/face */
//      int num_dmcache;                /* index to derived mesh data (face) to avoid slow lookups */
//      int pad;
//
//      int totkey;

        /* flag */
        prop= RNA_def_property(srna, "is_exist", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_negative_sdna(prop, NULL, "flag", PARS_UNEXIST);
        RNA_def_property_clear_flag(prop, PROP_EDITABLE);
        RNA_def_property_ui_text(prop, "Exists", "");

        prop= RNA_def_property(srna, "is_visible", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_negative_sdna(prop, NULL, "flag", PARS_NO_DISP);
        RNA_def_property_clear_flag(prop, PROP_EDITABLE);
        RNA_def_property_ui_text(prop, "Visible", "");

        prop= RNA_def_property(srna, "alive_state", PROP_ENUM, PROP_NONE);
        RNA_def_property_enum_sdna(prop, NULL, "alive");
        RNA_def_property_enum_items(prop, alive_items);
        RNA_def_property_ui_text(prop, "Alive State", "");

//      short rt2;
}

static void rna_def_particle_dupliweight(BlenderRNA *brna)
{
        StructRNA *srna;
        PropertyRNA *prop;

        srna = RNA_def_struct(brna, "ParticleDupliWeight", NULL);
        RNA_def_struct_ui_text(srna, "Particle Dupliobject Weight", "Weight of a particle dupliobject in a group");
        RNA_def_struct_sdna(srna, "ParticleDupliWeight");

        prop= RNA_def_property(srna, "name", PROP_STRING, PROP_NONE);
        RNA_def_property_string_funcs(prop, "rna_ParticleDupliWeight_name_get", "rna_ParticleDupliWeight_name_length", NULL);
        RNA_def_property_ui_text(prop, "Name", "Particle dupliobject name");
        RNA_def_property_clear_flag(prop, PROP_EDITABLE);
        RNA_def_struct_name_property(srna, prop);

        prop= RNA_def_property(srna, "count", PROP_INT, PROP_UNSIGNED);
        RNA_def_property_range(prop, 0, SHRT_MAX);
        RNA_def_property_ui_text(prop, "Count", "The number of times this object is repeated with respect to other objects");
        RNA_def_property_update(prop, 0, "rna_Particle_redo");
}

static void rna_def_fluid_settings(BlenderRNA *brna)
{
        StructRNA *srna;
        PropertyRNA *prop;
        
        srna = RNA_def_struct(brna, "SPHFluidSettings", NULL);
        RNA_def_struct_path_func(srna, "rna_SPHFluidSettings_path");
        RNA_def_struct_ui_text(srna, "SPH Fluid Settings", "Settings for particle fluids physics");
        
        /* Fluid settings */
        prop= RNA_def_property(srna, "spring_force", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "spring_k");
        RNA_def_property_range(prop, 0.0f, 100.0f);
        RNA_def_property_ui_range(prop, 0.0f, 10.0f, 1, 3);
        RNA_def_property_ui_text(prop, "Spring Force", "Spring force");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "fluid_radius", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "radius");
        RNA_def_property_range(prop, 0.0f, 20.0f);
        RNA_def_property_ui_range(prop, 0.0f, 2.0f, 1, 3);
        RNA_def_property_ui_text(prop, "Interaction Radius", "Fluid interaction radius");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "rest_length", PROP_FLOAT, PROP_NONE);
        RNA_def_property_range(prop, 0.0f, 2.0f);
        RNA_def_property_ui_text(prop, "Rest Length", "Spring rest length (factor of particle radius)");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "use_viscoelastic_springs", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_sdna(prop, NULL, "flag", SPH_VISCOELASTIC_SPRINGS);
        RNA_def_property_ui_text(prop, "Viscoelastic Springs", "Use viscoelastic springs instead of Hooke's springs");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "use_initial_rest_length", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_sdna(prop, NULL, "flag", SPH_CURRENT_REST_LENGTH);
        RNA_def_property_ui_text(prop, "Initial Rest Length", "Use the initial length as spring rest length instead of 2 * particle size");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "plasticity", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "plasticity_constant");
        RNA_def_property_range(prop, 0.0f, 100.0f);
        RNA_def_property_ui_text(prop, "Plasticity", "How much the spring rest length can change after the elastic limit is crossed");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "yield_ratio", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "yield_ratio");
        RNA_def_property_range(prop, 0.0f, 1.0f);
        RNA_def_property_ui_text(prop, "Elastic Limit", "How much the spring has to be stretched/compressed in order to change it's rest length");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "spring_frames", PROP_INT, PROP_NONE);
        RNA_def_property_range(prop, 0.0f, 100.0f);
        RNA_def_property_ui_text(prop, "Spring Frames", "Create springs for this number of frames since particles birth (0 is always)");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        /* Viscosity */
        prop= RNA_def_property(srna, "linear_viscosity", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "viscosity_omega");
        RNA_def_property_range(prop, 0.0f, 100.0f);
        RNA_def_property_ui_range(prop, 0.0f, 10.0f, 1, 3);
        RNA_def_property_ui_text(prop, "Viscosity", "Linear viscosity");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "stiff_viscosity", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "viscosity_beta");
        RNA_def_property_range(prop, 0.0f, 100.0f);
        RNA_def_property_ui_range(prop, 0.0f, 2.0f, 1, 3);
        RNA_def_property_ui_text(prop, "Stiff viscosity", "Creates viscosity for expanding fluid)");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        /* Double density relaxation */
        prop= RNA_def_property(srna, "stiffness", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "stiffness_k");
        RNA_def_property_range(prop, 0.0f, 100.0f);
        RNA_def_property_ui_range(prop, 0.0f, 10.0f, 1, 3);
        RNA_def_property_ui_text(prop, "Stiffness", "How incompressible the fluid is");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "repulsion", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "stiffness_knear");
        RNA_def_property_range(prop, 0.0f, 100.0f);
        RNA_def_property_ui_range(prop, 0.0f, 2.0f, 1, 3);
        RNA_def_property_ui_text(prop, "Repulsion Factor", "How strongly the fluid tries to keep from clustering (factor of stiffness)");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "rest_density", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "rest_density");
        RNA_def_property_range(prop, 0.0f, 100.0f);
        RNA_def_property_ui_range(prop, 0.0f, 2.0f, 1, 3);
        RNA_def_property_ui_text(prop, "Rest Density", "Fluid rest density");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        /* Buoyancy */
        prop= RNA_def_property(srna, "buoyancy", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "buoyancy");
        RNA_def_property_range(prop, 0.0f, 10.0f);
        RNA_def_property_ui_range(prop, 0.0f, 1.0f, 1, 3);
        RNA_def_property_ui_text(prop, "Buoyancy", "Artificial buoyancy force in negative gravity direction based on pressure differences inside the fluid");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        /* Factor flags */

        prop= RNA_def_property(srna, "factor_repulsion", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_sdna(prop, NULL, "flag", SPH_FAC_REPULSION);
        RNA_def_property_ui_text(prop, "Factor Repulsion", "Repulsion is a factor of stiffness");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "factor_density", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_sdna(prop, NULL, "flag", SPH_FAC_DENSITY);
        RNA_def_property_ui_text(prop, "Factor Density", "Density is calculated as a factor of default density (depends on particle size)");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "factor_radius", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_sdna(prop, NULL, "flag", SPH_FAC_RADIUS);
        RNA_def_property_ui_text(prop, "Factor Radius", "Interaction radius is a factor of 4 * particle size");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "factor_stiff_viscosity", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_sdna(prop, NULL, "flag", SPH_FAC_VISCOSITY);
        RNA_def_property_ui_text(prop, "Factor Stiff Viscosity", "Stiff viscosity is a factor of normal viscosity");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "factor_rest_length", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_sdna(prop, NULL, "flag", SPH_FAC_REST_LENGTH);
        RNA_def_property_ui_text(prop, "Factor Rest Length", "Spring rest length is a factor of 2 * particle size");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");
}

static void rna_def_particle_settings_mtex(BlenderRNA *brna)
{
        StructRNA *srna;
        PropertyRNA *prop;

        static EnumPropertyItem texco_items[] = {
                {TEXCO_GLOB, "GLOBAL", 0, "Global", "Uses global coordinates for the texture coordinates"},
                {TEXCO_OBJECT, "OBJECT", 0, "Object", "Uses linked object's coordinates for texture coordinates"},
                {TEXCO_UV, "UV", 0, "UV", "Uses UV coordinates for texture coordinates"},
                {TEXCO_ORCO, "ORCO", 0, "Generated", "Uses the original undeformed coordinates of the object"},
                {TEXCO_STRAND, "STRAND", 0, "Strand / Particle", "Uses normalized strand texture coordinate (1D) or particle age (X) and trail position (Y)"},
                {0, NULL, 0, NULL, NULL}};

        static EnumPropertyItem prop_mapping_items[] = {
                {MTEX_FLAT, "FLAT", 0, "Flat", "Maps X and Y coordinates directly"},
                {MTEX_CUBE, "CUBE", 0, "Cube", "Maps using the normal vector"},
                {MTEX_TUBE, "TUBE", 0, "Tube", "Maps with Z as central axis"},
                {MTEX_SPHERE, "SPHERE", 0, "Sphere", "Maps with Z as central axis"},
                {0, NULL, 0, NULL, NULL}};
                
        static EnumPropertyItem prop_x_mapping_items[] = {
                {0, "NONE", 0, "None", ""},
                {1, "X", 0, "X", ""},
                {2, "Y", 0, "Y", ""},
                {3, "Z", 0, "Z", ""},
                {0, NULL, 0, NULL, NULL}};
                
        static EnumPropertyItem prop_y_mapping_items[] = {
                {0, "NONE", 0, "None", ""},
                {1, "X", 0, "X", ""},
                {2, "Y", 0, "Y", ""},
                {3, "Z", 0, "Z", ""},
                {0, NULL, 0, NULL, NULL}};
                
        static EnumPropertyItem prop_z_mapping_items[] = {
                {0, "NONE", 0, "None", ""},
                {1, "X", 0, "X", ""},
                {2, "Y", 0, "Y", ""},
                {3, "Z", 0, "Z", ""},
                {0, NULL, 0, NULL, NULL}};

        srna= RNA_def_struct(brna, "ParticleSettingsTextureSlot", "TextureSlot");
        RNA_def_struct_sdna(srna, "MTex");
        RNA_def_struct_ui_text(srna, "Particle Settings Texture Slot", "Texture slot for textures in a Particle Settings datablock");

        prop= RNA_def_property(srna, "texture_coords", PROP_ENUM, PROP_NONE);
        RNA_def_property_enum_sdna(prop, NULL, "texco");
        RNA_def_property_enum_items(prop, texco_items);
        RNA_def_property_ui_text(prop, "Texture Coordinates", "Texture coordinates used to map the texture onto the background");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "object", PROP_POINTER, PROP_NONE);
        RNA_def_property_pointer_sdna(prop, NULL, "object");
        RNA_def_property_struct_type(prop, "Object");
        RNA_def_property_flag(prop, PROP_EDITABLE);
        RNA_def_property_ui_text(prop, "Object", "Object to use for mapping with Object texture coordinates");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "uv_layer", PROP_STRING, PROP_NONE);
        RNA_def_property_string_sdna(prop, NULL, "uvname");
        RNA_def_property_ui_text(prop, "UV Layer", "UV layer to use for mapping with UV texture coordinates");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "mapping_x", PROP_ENUM, PROP_NONE);
        RNA_def_property_enum_sdna(prop, NULL, "projx");
        RNA_def_property_enum_items(prop, prop_x_mapping_items);
        RNA_def_property_ui_text(prop, "X Mapping", "");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");
        
        prop= RNA_def_property(srna, "mapping_y", PROP_ENUM, PROP_NONE);
        RNA_def_property_enum_sdna(prop, NULL, "projy");
        RNA_def_property_enum_items(prop, prop_y_mapping_items);
        RNA_def_property_ui_text(prop, "Y Mapping", "");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");
        
        prop= RNA_def_property(srna, "mapping_z", PROP_ENUM, PROP_NONE);
        RNA_def_property_enum_sdna(prop, NULL, "projz");
        RNA_def_property_enum_items(prop, prop_z_mapping_items);
        RNA_def_property_ui_text(prop, "Z Mapping", "");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");
        
        prop= RNA_def_property(srna, "mapping", PROP_ENUM, PROP_NONE);
        RNA_def_property_enum_items(prop, prop_mapping_items);
        RNA_def_property_ui_text(prop, "Mapping", "");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        /* map to */
        prop= RNA_def_property(srna, "use_map_time", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_sdna(prop, NULL, "mapto", PAMAP_TIME);
        RNA_def_property_ui_text(prop, "Emission Time", "Affect the emission time of the particles");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "use_map_life", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_sdna(prop, NULL, "mapto", PAMAP_LIFE);
        RNA_def_property_ui_text(prop, "Life Time", "Affect the life time of the particles");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "use_map_density", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_sdna(prop, NULL, "mapto", PAMAP_DENS);
        RNA_def_property_ui_text(prop, "Density", "Affect the density of the particles");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "use_map_size", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_sdna(prop, NULL, "mapto", PAMAP_SIZE);
        RNA_def_property_ui_text(prop, "Size", "Affect the particle size");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "use_map_velocity", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_sdna(prop, NULL, "mapto", PAMAP_IVEL);
        RNA_def_property_ui_text(prop, "Initial Velocity", "Affect the particle initial velocity");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "use_map_field", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_sdna(prop, NULL, "mapto", PAMAP_FIELD);
        RNA_def_property_ui_text(prop, "Force Field", "Affect the particle force fields");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "use_map_gravity", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_sdna(prop, NULL, "mapto", PAMAP_GRAVITY);
        RNA_def_property_ui_text(prop, "Gravity", "Affect the particle gravity");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "use_map_damp", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_sdna(prop, NULL, "mapto", PAMAP_DAMP);
        RNA_def_property_ui_text(prop, "Damp", "Affect the particle velocity damping");
        RNA_def_property_update(prop, 0, "rna_Particle_redo_child");

        prop= RNA_def_property(srna, "use_map_clump", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_sdna(prop, NULL, "mapto", PAMAP_CLUMP);
        RNA_def_property_ui_text(prop, "Clump", "Affect the child clumping");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "use_map_kink", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_sdna(prop, NULL, "mapto", PAMAP_KINK);
        RNA_def_property_ui_text(prop, "Kink", "Affect the child kink");
        RNA_def_property_update(prop, 0, "rna_Particle_redo_child");

        prop= RNA_def_property(srna, "use_map_rough", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_sdna(prop, NULL, "mapto", PAMAP_ROUGH);
        RNA_def_property_ui_text(prop, "Rough", "Affect the child rough");
        RNA_def_property_update(prop, 0, "rna_Particle_redo_child");

        prop= RNA_def_property(srna, "use_map_length", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_sdna(prop, NULL, "mapto", PAMAP_LENGTH);
        RNA_def_property_ui_text(prop, "Length", "Affect the child hair length");
        RNA_def_property_update(prop, 0, "rna_Particle_redo_child");


        /* influence factors */
        prop= RNA_def_property(srna, "time_factor", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "timefac");
        RNA_def_property_ui_range(prop, 0, 1, 10, 3);
        RNA_def_property_ui_text(prop, "Emission Time Factor", "Amount texture affects particle emission time");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "life_factor", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "lifefac");
        RNA_def_property_ui_range(prop, 0, 1, 10, 3);
        RNA_def_property_ui_text(prop, "Life Time Factor", "Amount texture affects particle life time");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "density_factor", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "padensfac");
        RNA_def_property_ui_range(prop, 0, 1, 10, 3);
        RNA_def_property_ui_text(prop, "Density Factor", "Amount texture affects particle density");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "size_factor", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "sizefac");
        RNA_def_property_ui_range(prop, 0, 1, 10, 3);
        RNA_def_property_ui_text(prop, "Size Factor", "Amount texture affects physical particle size");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "velocity_factor", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "ivelfac");
        RNA_def_property_ui_range(prop, 0, 1, 10, 3);
        RNA_def_property_ui_text(prop, "Velocity Factor", "Amount texture affects particle initial velocity");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");


        prop= RNA_def_property(srna, "field_factor", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "fieldfac");
        RNA_def_property_ui_range(prop, 0, 1, 10, 3);
        RNA_def_property_ui_text(prop, "Field Factor", "Amount texture affects particle force fields");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "gravity_factor", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "gravityfac");
        RNA_def_property_ui_range(prop, 0, 1, 10, 3);
        RNA_def_property_ui_text(prop, "Gravity Factor", "Amount texture affects particle gravity");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "damp_factor", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "dampfac");
        RNA_def_property_ui_range(prop, 0, 1, 10, 3);
        RNA_def_property_ui_text(prop, "Damp Factor", "Amount texture affects particle damping");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");


        prop= RNA_def_property(srna, "length_factor", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "lengthfac");
        RNA_def_property_ui_range(prop, 0, 1, 10, 3);
        RNA_def_property_ui_text(prop, "Length Factor", "Amount texture affects child hair length");
        RNA_def_property_update(prop, 0, "rna_Particle_redo_child");

        prop= RNA_def_property(srna, "clump_factor", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "clumpfac");
        RNA_def_property_ui_range(prop, 0, 1, 10, 3);
        RNA_def_property_ui_text(prop, "Clump Factor", "Amount texture affects child clump");
        RNA_def_property_update(prop, 0, "rna_Particle_redo_child");

        prop= RNA_def_property(srna, "kink_factor", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "kinkfac");
        RNA_def_property_ui_range(prop, 0, 1, 10, 3);
        RNA_def_property_ui_text(prop, "Kink Factor", "Amount texture affects child kink");
        RNA_def_property_update(prop, 0, "rna_Particle_redo_child");

        prop= RNA_def_property(srna, "rough_factor", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "roughfac");
        RNA_def_property_ui_range(prop, 0, 1, 10, 3);
        RNA_def_property_ui_text(prop, "Rough Factor", "Amount texture affects child roughness");
        RNA_def_property_update(prop, 0, "rna_Particle_redo_child");
}

static void rna_def_particle_settings(BlenderRNA *brna)
{
        StructRNA *srna;
        PropertyRNA *prop;

        static EnumPropertyItem type_items[] = {
                {PART_EMITTER, "EMITTER", 0, "Emitter", ""},
                //{PART_REACTOR, "REACTOR", 0, "Reactor", ""},
                {PART_HAIR, "HAIR", 0, "Hair", ""},
                {0, NULL, 0, NULL, NULL}
        };

        static EnumPropertyItem phys_type_items[] = {
                {PART_PHYS_NO, "NO", 0, "No", ""},
                {PART_PHYS_NEWTON, "NEWTON", 0, "Newtonian", ""},
                {PART_PHYS_KEYED, "KEYED", 0, "Keyed", ""},
                {PART_PHYS_BOIDS, "BOIDS", 0, "Boids", ""},
                {PART_PHYS_FLUID, "FLUID", 0, "Fluid", ""},
                {0, NULL, 0, NULL, NULL}
        };

        static EnumPropertyItem rot_mode_items[] = {
                {0, "NONE", 0, "None", ""},
                {PART_ROT_NOR, "NOR", 0, "Normal", ""},
                {PART_ROT_VEL, "VEL", 0, "Velocity", ""},
                {PART_ROT_GLOB_X, "GLOB_X", 0, "Global X", ""},
                {PART_ROT_GLOB_Y, "GLOB_Y", 0, "Global Y", ""},
                {PART_ROT_GLOB_Z, "GLOB_Z", 0, "Global Z", ""},
                {PART_ROT_OB_X, "OB_X", 0, "Object X", ""},
                {PART_ROT_OB_Y, "OB_Y", 0, "Object Y", ""},
                {PART_ROT_OB_Z, "OB_Z", 0, "Object Z", ""},
                {0, NULL, 0, NULL, NULL}
        };

        static EnumPropertyItem ave_mode_items[] = {
                {0, "NONE", 0, "None", ""},
                {PART_AVE_SPIN, "SPIN", 0, "Spin", ""},
                {PART_AVE_RAND, "RAND", 0, "Random", ""} ,
                {0, NULL, 0, NULL, NULL}
        };

        static EnumPropertyItem react_event_items[] = {
                {PART_EVENT_DEATH, "DEATH", 0, "Death", ""},
                {PART_EVENT_COLLIDE, "COLLIDE", 0, "Collision", ""},
                {PART_EVENT_NEAR, "NEAR", 0, "Near", ""},
                {0, NULL, 0, NULL, NULL}
        };

        static EnumPropertyItem child_type_items[] = {
                {0, "NONE", 0, "None", ""},
                {PART_CHILD_PARTICLES, "SIMPLE", 0, "Simple", ""},
                {PART_CHILD_FACES, "INTERPOLATED", 0, "Interpolated", ""},
                {0, NULL, 0, NULL, NULL}
        };

        //TODO: names, tooltips
#if 0
        static EnumPropertyItem rot_from_items[] = {
                {PART_ROT_KEYS, "KEYS", 0, "keys", ""},
                {PART_ROT_ZINCR, "ZINCR", 0, "zincr", ""},
                {PART_ROT_IINCR, "IINCR", 0, "iincr", ""},
                {0, NULL, 0, NULL, NULL}
        };
#endif
        static EnumPropertyItem integrator_type_items[] = {
                {PART_INT_EULER, "EULER", 0, "Euler", ""},
                {PART_INT_VERLET, "VERLET", 0, "Verlet", ""},
                {PART_INT_MIDPOINT, "MIDPOINT", 0, "Midpoint", ""},
                {PART_INT_RK4, "RK4", 0, "RK4", ""},
                {0, NULL, 0, NULL, NULL}
        };

        static EnumPropertyItem kink_type_items[] = {
                {PART_KINK_NO, "NO", 0, "Nothing", ""},
                {PART_KINK_CURL, "CURL", 0, "Curl", ""},
                {PART_KINK_RADIAL, "RADIAL", 0, "Radial", ""},
                {PART_KINK_WAVE, "WAVE", 0, "Wave", ""},
                {PART_KINK_BRAID, "BRAID", 0, "Braid", ""},
                {0, NULL, 0, NULL, NULL}
        };

        static EnumPropertyItem kink_axis_items[] = {
                {0, "X", 0, "X", ""},
                {1, "Y", 0, "Y", ""},
                {2, "Z", 0, "Z", ""},
                {0, NULL, 0, NULL, NULL}
        };

        static EnumPropertyItem bb_align_items[] = {
                {PART_BB_X, "X", 0, "X", ""},
                {PART_BB_Y, "Y", 0, "Y", ""},
                {PART_BB_Z, "Z", 0, "Z", ""},
                {PART_BB_VIEW, "VIEW", 0, "View", ""},
                {PART_BB_VEL, "VEL", 0, "Velocity", ""},
                {0, NULL, 0, NULL, NULL}
        };

        static EnumPropertyItem bb_anim_items[] = {
                {PART_BB_ANIM_NONE, "NONE", 0, "None", ""},
                {PART_BB_ANIM_AGE, "AGE", 0, "Age", ""},
                {PART_BB_ANIM_FRAME, "FRAME", 0, "Frame", ""},
                {PART_BB_ANIM_ANGLE, "ANGLE", 0, "Angle", ""},
                {0, NULL, 0, NULL, NULL}
        };

        static EnumPropertyItem bb_split_offset_items[] = {
                {PART_BB_OFF_NONE, "NONE", 0, "None", ""},
                {PART_BB_OFF_LINEAR, "LINEAR", 0, "Linear", ""},
                {PART_BB_OFF_RANDOM, "RANDOM", 0, "Random", ""},
                {0, NULL, 0, NULL, NULL}
        };

        static EnumPropertyItem draw_col_items[] = {
                {PART_DRAW_COL_NONE, "NONE", 0, "None", ""},
                {PART_DRAW_COL_MAT, "MATERIAL", 0, "Material", ""},
                {PART_DRAW_COL_VEL, "VELOCITY", 0, "Velocity", ""},
                {PART_DRAW_COL_ACC, "ACCELERATION", 0, "Acceleration", ""},
                {0, NULL, 0, NULL, NULL}
        };

        srna= RNA_def_struct(brna, "ParticleSettings", "ID");
        RNA_def_struct_ui_text(srna, "Particle Settings", "Particle settings, reusable by multiple particle systems");
        RNA_def_struct_ui_icon(srna, ICON_PARTICLE_DATA);

        rna_def_mtex_common(brna, srna, "rna_ParticleSettings_mtex_begin", "rna_ParticleSettings_active_texture_get",
                "rna_ParticleSettings_active_texture_set", NULL, "ParticleSettingsTextureSlot", "ParticleSettingsTextureSlots", "rna_Particle_reset");

        /* fluid particle type can't be checked from the type value in rna as it's not shown in the menu */
        prop= RNA_def_property(srna, "is_fluid", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_clear_flag(prop, PROP_EDITABLE);
        RNA_def_property_boolean_funcs(prop, "rna_PartSettings_is_fluid_get", NULL);
        RNA_def_property_ui_text(prop, "Fluid", "Particles were created by a fluid simulation");

        /* flag */
        prop= RNA_def_property(srna, "use_react_start_end", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_sdna(prop, NULL, "flag", PART_REACT_STA_END);
        RNA_def_property_clear_flag(prop, PROP_ANIMATABLE);
        RNA_def_property_ui_text(prop, "Start/End", "Give birth to unreacted particles eventually");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "use_react_multiple", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_sdna(prop, NULL, "flag", PART_REACT_MULTIPLE);
        RNA_def_property_clear_flag(prop, PROP_ANIMATABLE);
        RNA_def_property_ui_text(prop, "Multi React", "React multiple times");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "regrow_hair", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_sdna(prop, NULL, "flag", PART_HAIR_REGROW);
        RNA_def_property_ui_text(prop, "Regrow", "Regrow hair for each frame");
        RNA_def_property_update(prop, 0, "rna_Particle_redo");

        prop= RNA_def_property(srna, "show_unborn", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_sdna(prop, NULL, "flag", PART_UNBORN);
        RNA_def_property_ui_text(prop, "Unborn", "Show particles before they are emitted");
        RNA_def_property_update(prop, 0, "rna_Particle_redo");

        prop= RNA_def_property(srna, "use_dead", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_sdna(prop, NULL, "flag", PART_DIED);
        RNA_def_property_ui_text(prop, "Died", "Show particles after they have died");
        RNA_def_property_update(prop, 0, "rna_Particle_redo");

        prop= RNA_def_property(srna, "use_emit_random", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_sdna(prop, NULL, "flag", PART_TRAND);
        RNA_def_property_clear_flag(prop, PROP_ANIMATABLE);
        RNA_def_property_ui_text(prop, "Random", "Emit in random order of elements");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "use_even_distribution", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_sdna(prop, NULL, "flag", PART_EDISTR);
        RNA_def_property_clear_flag(prop, PROP_ANIMATABLE);
        RNA_def_property_ui_text(prop, "Even Distribution", "Use even distribution from faces based on face areas or edge lengths");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");
 
        prop= RNA_def_property(srna, "use_die_on_collision", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_sdna(prop, NULL, "flag", PART_DIE_ON_COL);
        RNA_def_property_clear_flag(prop, PROP_ANIMATABLE);
        RNA_def_property_ui_text(prop, "Die on hit", "Particles die when they collide with a deflector object");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "use_size_deflect", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_sdna(prop, NULL, "flag", PART_SIZE_DEFL);
        RNA_def_property_clear_flag(prop, PROP_ANIMATABLE);
        RNA_def_property_ui_text(prop, "Size Deflect", "Use particle's size in deflection");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "use_dynamic_rotation", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_sdna(prop, NULL, "flag", PART_ROT_DYN);
        RNA_def_property_clear_flag(prop, PROP_ANIMATABLE);
        RNA_def_property_ui_text(prop, "Dynamic", "Sets rotation to dynamic/constant");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "use_multiply_size_mass", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_sdna(prop, NULL, "flag", PART_SIZEMASS);
        RNA_def_property_clear_flag(prop, PROP_ANIMATABLE);
        RNA_def_property_ui_text(prop, "Mass from Size", "Multiply mass by particle size");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "use_advanced_hair", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_negative_sdna(prop, NULL, "flag", PART_HIDE_ADVANCED_HAIR);
        RNA_def_property_clear_flag(prop, PROP_ANIMATABLE);
        RNA_def_property_ui_text(prop, "Advanced", "Use full physics calculations for growing hair");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "lock_boids_to_surface", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_sdna(prop, NULL, "flag", PART_BOIDS_2D);
        RNA_def_property_ui_text(prop, "Boids 2D", "Constrain boids to a surface");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "use_hair_bspline", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_sdna(prop, NULL, "flag", PART_HAIR_BSPLINE);
        RNA_def_property_ui_text(prop, "B-Spline", "Interpolate hair using B-Splines");
        RNA_def_property_update(prop, 0, "rna_Particle_redo");

        prop= RNA_def_property(srna, "invert_grid", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_sdna(prop, NULL, "flag", PART_GRID_INVERT);
        RNA_def_property_ui_text(prop, "Invert Grid", "Invert what is considered object and what is not");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "hexagonal_grid", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_sdna(prop, NULL, "flag", PART_GRID_HEXAGONAL);
        RNA_def_property_ui_text(prop, "Hexagonal Grid", "Create the grid in a hexagonal pattern");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "apply_effector_to_children", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_sdna(prop, NULL, "flag", PART_CHILD_EFFECT);
        RNA_def_property_ui_text(prop, "Effect Children", "Apply effectors to children");
        RNA_def_property_update(prop, 0, "rna_Particle_redo");

        prop= RNA_def_property(srna, "create_long_hair_children", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_sdna(prop, NULL, "flag", PART_CHILD_LONG_HAIR);
        RNA_def_property_ui_text(prop, "Long Hair", "Calculate children that suit long hair well");
        RNA_def_property_update(prop, 0, "rna_Particle_redo_child");

        prop= RNA_def_property(srna, "apply_guide_to_children", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_sdna(prop, NULL, "flag", PART_CHILD_GUIDE);
        RNA_def_property_ui_text(prop, "apply_guide_to_children", "");
        RNA_def_property_update(prop, 0, "rna_Particle_redo");

        prop= RNA_def_property(srna, "use_self_effect", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_sdna(prop, NULL, "flag", PART_SELF_EFFECT);
        RNA_def_property_ui_text(prop, "Self Effect", "Particle effectors effect themselves");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");


        prop= RNA_def_property(srna, "type", PROP_ENUM, PROP_NONE);
        RNA_def_property_enum_items(prop, type_items);
        RNA_def_property_clear_flag(prop, PROP_ANIMATABLE);
        RNA_def_property_ui_text(prop, "Type", "Particle Type");
        RNA_def_property_update(prop, 0, "rna_Particle_change_type");

        prop= RNA_def_property(srna, "emit_from", PROP_ENUM, PROP_NONE);
        RNA_def_property_enum_sdna(prop, NULL, "from");
        RNA_def_property_enum_items(prop, part_reactor_from_items);
        RNA_def_property_clear_flag(prop, PROP_ANIMATABLE);
        RNA_def_property_enum_funcs(prop, NULL, NULL, "rna_Particle_from_itemf");
        RNA_def_property_ui_text(prop, "Emit From", "Where to emit particles from");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "distribution", PROP_ENUM, PROP_NONE);
        RNA_def_property_enum_sdna(prop, NULL, "distr");
        RNA_def_property_clear_flag(prop, PROP_ANIMATABLE);
        RNA_def_property_enum_items(prop, part_dist_items);
        RNA_def_property_enum_items(prop, part_draw_as_items);
        RNA_def_property_enum_funcs(prop, NULL, NULL, "rna_Particle_dist_itemf");
        RNA_def_property_ui_text(prop, "Distribution", "How to distribute particles on selected element");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        /* physics modes */
        prop= RNA_def_property(srna, "physics_type", PROP_ENUM, PROP_NONE);
        RNA_def_property_enum_sdna(prop, NULL, "phystype");
        RNA_def_property_clear_flag(prop, PROP_ANIMATABLE);
        RNA_def_property_enum_items(prop, phys_type_items);
        RNA_def_property_ui_text(prop, "Physics Type", "Particle physics type");
        RNA_def_property_update(prop, 0, "rna_Particle_change_physics");

        prop= RNA_def_property(srna, "rotation_mode", PROP_ENUM, PROP_NONE);
        RNA_def_property_enum_sdna(prop, NULL, "rotmode");
        RNA_def_property_clear_flag(prop, PROP_ANIMATABLE);
        RNA_def_property_enum_items(prop, rot_mode_items);
        RNA_def_property_ui_text(prop, "Rotation", "Particles initial rotation");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "angular_velocity_mode", PROP_ENUM, PROP_NONE);
        RNA_def_property_enum_sdna(prop, NULL, "avemode");
        RNA_def_property_clear_flag(prop, PROP_ANIMATABLE);
        RNA_def_property_enum_items(prop, ave_mode_items);
        RNA_def_property_ui_text(prop, "Angular Velocity Mode", "Particle angular velocity mode");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "react_event", PROP_ENUM, PROP_NONE);
        RNA_def_property_enum_sdna(prop, NULL, "reactevent");
        RNA_def_property_clear_flag(prop, PROP_ANIMATABLE);
        RNA_def_property_enum_items(prop, react_event_items);
        RNA_def_property_ui_text(prop, "React On", "The event of target particles to react on");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        /*draw flag*/
        prop= RNA_def_property(srna, "show_velocity", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_sdna(prop, NULL, "draw", PART_DRAW_VEL);
        RNA_def_property_ui_text(prop, "Velocity", "Show particle velocity");
        RNA_def_property_update(prop, 0, "rna_Particle_redo");

        prop= RNA_def_property(srna, "show_size", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_sdna(prop, NULL, "draw", PART_DRAW_SIZE);
        RNA_def_property_ui_text(prop, "Size", "Show particle size");
        RNA_def_property_update(prop, 0, "rna_Particle_redo");

        prop= RNA_def_property(srna, "use_render_emitter", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_sdna(prop, NULL, "draw", PART_DRAW_EMITTER);
        RNA_def_property_ui_text(prop, "Emitter", "Render emitter Object also");
        RNA_def_property_update(prop, 0, "rna_Particle_redo");

        prop= RNA_def_property(srna, "show_health", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_sdna(prop, NULL, "draw", PART_DRAW_HEALTH);
        RNA_def_property_ui_text(prop, "Health", "Draw boid health");
        RNA_def_property_update(prop, 0, "rna_Particle_redo");

        prop= RNA_def_property(srna, "use_absolute_path_time", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_sdna(prop, NULL, "draw", PART_ABS_PATH_TIME);
        RNA_def_property_ui_text(prop, "Absolute Path Time", "Path timing is in absolute frames");
        RNA_def_property_update(prop, 0, "rna_Particle_abspathtime_update");

        prop= RNA_def_property(srna, "use_parent_particles", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_sdna(prop, NULL, "draw", PART_DRAW_PARENT);
        RNA_def_property_ui_text(prop, "Parents", "Render parent particles");
        RNA_def_property_update(prop, 0, "rna_Particle_redo");

        prop= RNA_def_property(srna, "show_number", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_sdna(prop, NULL, "draw", PART_DRAW_NUM);
        RNA_def_property_ui_text(prop, "Number", "Show particle number");
        RNA_def_property_update(prop, 0, "rna_Particle_redo");

        prop= RNA_def_property(srna, "use_group_pick_random", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_sdna(prop, NULL, "draw", PART_DRAW_RAND_GR);
        RNA_def_property_ui_text(prop, "Pick Random", "Pick objects from group randomly");
        RNA_def_property_update(prop, 0, "rna_Particle_redo");

        prop= RNA_def_property(srna, "use_group_count", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_sdna(prop, NULL, "draw", PART_DRAW_COUNT_GR);
        RNA_def_property_ui_text(prop, "Use Count", "Use object multiple times in the same group");
        RNA_def_property_update(prop, 0, "rna_Particle_redo");

        prop= RNA_def_property(srna, "use_global_dupli", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_sdna(prop, NULL, "draw", PART_DRAW_GLOBAL_OB);
        RNA_def_property_ui_text(prop, "Use Global", "Use object's global coordinates for duplication");
        RNA_def_property_update(prop, 0, "rna_Particle_redo");

        prop= RNA_def_property(srna, "use_render_adaptive", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_sdna(prop, NULL, "draw", PART_DRAW_REN_ADAPT);
        RNA_def_property_ui_text(prop, "Adaptive render", "Draw steps of the particle path");
        RNA_def_property_update(prop, 0, "rna_Particle_redo");

        prop= RNA_def_property(srna, "use_velocity_length", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_sdna(prop, NULL, "draw", PART_DRAW_VEL_LENGTH);
        RNA_def_property_ui_text(prop, "Speed", "Multiply line length by particle speed");
        RNA_def_property_update(prop, 0, "rna_Particle_redo");

        prop= RNA_def_property(srna, "use_whole_group", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_sdna(prop, NULL, "draw", PART_DRAW_WHOLE_GR);
        RNA_def_property_ui_text(prop, "Whole Group", "Use whole group at once");
        RNA_def_property_update(prop, 0, "rna_Particle_redo");

        prop= RNA_def_property(srna, "use_strand_primitive", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_sdna(prop, NULL, "draw", PART_DRAW_REN_STRAND);
        RNA_def_property_ui_text(prop, "Strand render", "Use the strand primitive for rendering");
        RNA_def_property_update(prop, 0, "rna_Particle_redo");

        prop= RNA_def_property(srna, "draw_method", PROP_ENUM, PROP_NONE);
        RNA_def_property_enum_sdna(prop, NULL, "draw_as");
        RNA_def_property_enum_items(prop, part_draw_as_items);
        RNA_def_property_enum_funcs(prop, NULL, NULL, "rna_Particle_draw_as_itemf");
        RNA_def_property_ui_text(prop, "Particle Drawing", "How particles are drawn in viewport");
        RNA_def_property_update(prop, 0, "rna_Particle_redo");

        prop= RNA_def_property(srna, "render_type", PROP_ENUM, PROP_NONE);
        RNA_def_property_enum_sdna(prop, NULL, "ren_as");
        RNA_def_property_enum_items(prop, part_ren_as_items);
        RNA_def_property_enum_funcs(prop, NULL, NULL, "rna_Particle_ren_as_itemf");
        RNA_def_property_ui_text(prop, "Particle Rendering", "How particles are rendered");
        RNA_def_property_update(prop, 0, "rna_Particle_redo");

        prop= RNA_def_property(srna, "draw_color", PROP_ENUM, PROP_NONE);
        RNA_def_property_enum_sdna(prop, NULL, "draw_col");
        RNA_def_property_enum_items(prop, draw_col_items);
        RNA_def_property_ui_text(prop, "Draw Color", "Draw additional particle data as a color");
        RNA_def_property_update(prop, 0, "rna_Particle_redo");

        prop= RNA_def_property(srna, "draw_size", PROP_INT, PROP_NONE);
        RNA_def_property_range(prop, 0, 1000);
        RNA_def_property_ui_range(prop, 0, 100, 1, 0);
        RNA_def_property_ui_text(prop, "Draw Size", "Size of particles on viewport in pixels (0=default)");
        RNA_def_property_update(prop, 0, "rna_Particle_redo");

        prop= RNA_def_property(srna, "child_type", PROP_ENUM, PROP_NONE);
        RNA_def_property_enum_sdna(prop, NULL, "childtype");
        RNA_def_property_enum_items(prop, child_type_items);
        RNA_def_property_ui_text(prop, "Children From", "Create child particles");
        RNA_def_property_update(prop, 0, "rna_Particle_redo_child");

        prop= RNA_def_property(srna, "draw_step", PROP_INT, PROP_NONE);
        RNA_def_property_range(prop, 0, 10);
        RNA_def_property_ui_range(prop, 0, 7, 1, 0);
        RNA_def_property_ui_text(prop, "Steps", "How many steps paths are drawn with (power of 2)");
        RNA_def_property_update(prop, 0, "rna_Particle_redo");

        prop= RNA_def_property(srna, "render_step", PROP_INT, PROP_NONE);
        RNA_def_property_int_sdna(prop, NULL, "ren_step");
        RNA_def_property_range(prop, 0, 20);
        RNA_def_property_ui_range(prop, 0, 9, 1, 0);
        RNA_def_property_ui_text(prop, "Render", "How many steps paths are rendered with (power of 2)");

        prop= RNA_def_property(srna, "hair_step", PROP_INT, PROP_NONE);
        RNA_def_property_range(prop, 2, 50);
        RNA_def_property_ui_text(prop, "Segments", "Number of hair segments");
        RNA_def_property_update(prop, 0, "rna_Particle_redo");


        //TODO: not found in UI, readonly?
        prop= RNA_def_property(srna, "keys_step", PROP_INT, PROP_NONE);
        RNA_def_property_range(prop, 0, SHRT_MAX);//TODO:min,max
        RNA_def_property_ui_text(prop, "Keys Step", "");

        /* adaptive path rendering */
        prop= RNA_def_property(srna, "adaptive_angle", PROP_INT, PROP_NONE);
        RNA_def_property_int_sdna(prop, NULL, "adapt_angle");
        RNA_def_property_range(prop, 0, 45);
        RNA_def_property_ui_text(prop, "Degrees", "How many degrees path has to curve to make another render segment");

        prop= RNA_def_property(srna, "adaptive_pixel", PROP_INT, PROP_NONE);
        RNA_def_property_int_sdna(prop, NULL, "adapt_pix");
        RNA_def_property_range(prop, 0, 50);
        RNA_def_property_ui_text(prop, "Pixel", "How many pixels path has to cover to make another render segment");

        prop= RNA_def_property(srna, "draw_percentage", PROP_INT, PROP_NONE);
        RNA_def_property_int_sdna(prop, NULL, "disp");
        RNA_def_property_range(prop, 0, 100);
        RNA_def_property_ui_text(prop, "Display", "Percentage of particles to display in 3D view");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "material", PROP_INT, PROP_NONE);
        RNA_def_property_int_sdna(prop, NULL, "omat");
        RNA_def_property_range(prop, 1, 32767);
        RNA_def_property_ui_text(prop, "Material", "Specify material used for the particles");
        RNA_def_property_update(prop, 0, "rna_Particle_redo");


        // not used anywhere, why is this in DNA???
#if 0
        prop= RNA_def_property(srna, "rotate_from", PROP_ENUM, PROP_NONE);
        RNA_def_property_enum_sdna(prop, NULL, "rotfrom");
        RNA_def_property_enum_items(prop, rot_from_items);
        RNA_def_property_ui_text(prop, "Rotate From", "");
#endif

        prop= RNA_def_property(srna, "integrator", PROP_ENUM, PROP_NONE);
        RNA_def_property_enum_items(prop, integrator_type_items);
        RNA_def_property_ui_text(prop, "Integration", "Algorithm used to calculate physics. Fastest to most stable/accurate: Midpoint, Euler, Verlet, RK4 (Old)");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "kink", PROP_ENUM, PROP_NONE);
        RNA_def_property_enum_items(prop, kink_type_items);
        RNA_def_property_ui_text(prop, "Kink", "Type of periodic offset on the path");
        RNA_def_property_update(prop, 0, "rna_Particle_redo_child");

        prop= RNA_def_property(srna, "kink_axis", PROP_ENUM, PROP_NONE);
        RNA_def_property_enum_items(prop, kink_axis_items);
        RNA_def_property_ui_text(prop, "Axis", "Which axis to use for offset");
        RNA_def_property_update(prop, 0, "rna_Particle_redo_child");

        /* billboards */
        prop= RNA_def_property(srna, "lock_billboard", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_sdna(prop, NULL, "draw", PART_DRAW_BB_LOCK);
        RNA_def_property_ui_text(prop, "Lock Billboard", "Lock the billboards align axis");
        RNA_def_property_update(prop, 0, "rna_Particle_redo");

        prop= RNA_def_property(srna, "billboard_align", PROP_ENUM, PROP_NONE);
        RNA_def_property_enum_sdna(prop, NULL, "bb_align");
        RNA_def_property_enum_items(prop, bb_align_items);
        RNA_def_property_ui_text(prop, "Align to", "In respect to what the billboards are aligned");
        RNA_def_property_update(prop, 0, "rna_Particle_redo");

        prop= RNA_def_property(srna, "billboard_uv_split", PROP_INT, PROP_NONE);
        RNA_def_property_int_sdna(prop, NULL, "bb_uv_split");
        RNA_def_property_range(prop, 1, 100);
        RNA_def_property_ui_range(prop, 1, 10, 1, 0);
        RNA_def_property_ui_text(prop, "UV Split", "Amount of rows/columns to split UV coordinates for billboards");

        prop= RNA_def_property(srna, "billboard_animation", PROP_ENUM, PROP_NONE);
        RNA_def_property_enum_sdna(prop, NULL, "bb_anim");
        RNA_def_property_enum_items(prop, bb_anim_items);
        RNA_def_property_ui_text(prop, "Animate", "How to animate billboard textures");

        prop= RNA_def_property(srna, "billboard_offset_split", PROP_ENUM, PROP_NONE);
        RNA_def_property_enum_sdna(prop, NULL, "bb_split_offset");
        RNA_def_property_enum_items(prop, bb_split_offset_items);
        RNA_def_property_ui_text(prop, "Offset", "How to offset billboard textures");

        prop= RNA_def_property(srna, "billboard_tilt", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "bb_tilt");
        RNA_def_property_range(prop, -1.0f, 1.0f);
        RNA_def_property_ui_text(prop, "Tilt", "Tilt of the billboards");
        RNA_def_property_update(prop, 0, "rna_Particle_redo");

        prop= RNA_def_property(srna, "color_maximum", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "color_vec_max");
        RNA_def_property_range(prop, 0.01f, 100.0f);
        RNA_def_property_ui_text(prop, "Color Maximum", "Maximum length of the particle color vector");
        RNA_def_property_update(prop, 0, "rna_Particle_redo");

        prop= RNA_def_property(srna, "billboard_tilt_random", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "bb_rand_tilt");
        RNA_def_property_range(prop, 0.0f, 1.0f);
        RNA_def_property_ui_text(prop, "Random Tilt", "Random tilt of the billboards");
        RNA_def_property_update(prop, 0, "rna_Particle_redo");

        prop= RNA_def_property(srna, "billboard_offset", PROP_FLOAT, PROP_TRANSLATION);
        RNA_def_property_float_sdna(prop, NULL, "bb_offset");
        RNA_def_property_array(prop, 2);
        RNA_def_property_range(prop, -100.0f, 100.0f);
        RNA_def_property_ui_range(prop, -1.0, 1.0, 0.1, 3);
        RNA_def_property_ui_text(prop, "Billboard Offset", "");
        RNA_def_property_update(prop, 0, "rna_Particle_redo");

        prop= RNA_def_property(srna, "billboard_size", PROP_FLOAT, PROP_FACTOR);
        RNA_def_property_float_sdna(prop, NULL, "bb_size");
        RNA_def_property_array(prop, 2);
        RNA_def_property_range(prop, 0.001f, 10.0f);
        RNA_def_property_ui_text(prop, "Billboard Scale", "Scale billboards relative to particle size");
        RNA_def_property_update(prop, 0, "rna_Particle_redo");

        prop= RNA_def_property(srna, "billboard_velocity_head", PROP_FLOAT, PROP_FACTOR);
        RNA_def_property_float_sdna(prop, NULL, "bb_vel_head");
        RNA_def_property_range(prop, 0.0f, 10.0f);
        RNA_def_property_ui_text(prop, "Billboard Velocity Head", "Scale billboards by velocity");
        RNA_def_property_update(prop, 0, "rna_Particle_redo");

        prop= RNA_def_property(srna, "billboard_velocity_tail", PROP_FLOAT, PROP_FACTOR);
        RNA_def_property_float_sdna(prop, NULL, "bb_vel_tail");
        RNA_def_property_range(prop, 0.0f, 10.0f);
        RNA_def_property_ui_text(prop, "Billboard Velocity Tail", "Scale billboards by velocity");
        RNA_def_property_update(prop, 0, "rna_Particle_redo");

        /* simplification */
        prop= RNA_def_property(srna, "use_simplify", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_sdna(prop, NULL, "simplify_flag", PART_SIMPLIFY_ENABLE);
        RNA_def_property_ui_text(prop, "Child Simplification", "Remove child strands as the object becomes smaller on the screen");

        prop= RNA_def_property(srna, "use_simplify_viewport", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_sdna(prop, NULL, "simplify_flag", PART_SIMPLIFY_VIEWPORT);
        RNA_def_property_ui_text(prop, "Viewport", "");

        prop= RNA_def_property(srna, "simplify_refsize", PROP_INT, PROP_UNSIGNED);
        RNA_def_property_int_sdna(prop, NULL, "simplify_refsize");
        RNA_def_property_range(prop, 1, 32768);
        RNA_def_property_ui_text(prop, "Reference Size", "Reference size in pixels, after which simplification begins");

        prop= RNA_def_property(srna, "simplify_rate", PROP_FLOAT, PROP_NONE);
        RNA_def_property_range(prop, 0.0f, 1.0f);
        RNA_def_property_ui_text(prop, "Rate", "Speed of simplification");

        prop= RNA_def_property(srna, "simplify_transition", PROP_FLOAT, PROP_NONE);
        RNA_def_property_range(prop, 0.0f, 1.0f);
        RNA_def_property_ui_text(prop, "Transition", "Transition period for fading out strands");

        prop= RNA_def_property(srna, "simplify_viewport", PROP_FLOAT, PROP_NONE);
        RNA_def_property_range(prop, 0.0f, 0.999f);
        RNA_def_property_ui_text(prop, "Rate", "Speed of Simplification");

        /* general values */
        prop= RNA_def_property(srna, "frame_start", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "sta");//optional if prop names are the same
        RNA_def_property_range(prop, MINAFRAMEF, MAXFRAMEF);
        RNA_def_property_clear_flag(prop, PROP_ANIMATABLE);
        RNA_def_property_float_funcs(prop, NULL, "rna_PartSettings_start_set", NULL);
        RNA_def_property_ui_text(prop, "Start", "Frame # to start emitting particles");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "frame_end", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "end");
        RNA_def_property_range(prop, MINAFRAMEF, MAXFRAMEF);

        RNA_def_property_clear_flag(prop, PROP_ANIMATABLE);
        RNA_def_property_float_funcs(prop, NULL, "rna_PartSettings_end_set", NULL);
        RNA_def_property_ui_text(prop, "End", "Frame # to stop emitting particles");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "lifetime", PROP_FLOAT, PROP_TIME);
        RNA_def_property_range(prop, 1.0f, MAXFRAMEF);
        RNA_def_property_ui_text(prop, "Lifetime", "Specify the life span of the particles");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "lifetime_random", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "randlife");
        RNA_def_property_range(prop, 0.0f, 1.0f);
        RNA_def_property_ui_text(prop, "Random", "Give the particle life a random variation");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "time_tweak", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "timetweak");
        RNA_def_property_range(prop, 0.0f, 100.0f);
        RNA_def_property_ui_range(prop, 0, 10, 1, 3);
        RNA_def_property_ui_text(prop, "Tweak", "A multiplier for physics timestep (1.0 means one frame = 1/25 seconds)");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "timestep", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_funcs(prop, "rna_PartSettings_timestep_get", "rna_PartSetings_timestep_set", NULL);
        RNA_def_property_range(prop, 0.0001, 100.0);
        RNA_def_property_ui_range(prop, 0.01, 10, 1, 3);
        RNA_def_property_ui_text(prop, "Timestep", "The simulation timestep per frame (in seconds)");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");
        
        prop= RNA_def_property(srna, "subframes", PROP_INT, PROP_NONE);
        RNA_def_property_range(prop, 0, 1000);  
        RNA_def_property_ui_text(prop, "Subframes", "Subframes to simulate for improved stability and finer granularity simulations");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "jitter_factor", PROP_FLOAT, PROP_NONE);
        RNA_def_property_clear_flag(prop, PROP_ANIMATABLE);
        RNA_def_property_float_sdna(prop, NULL, "jitfac");
        RNA_def_property_range(prop, 0.0f, 2.0f);
        RNA_def_property_ui_text(prop, "Amount", "Amount of jitter applied to the sampling");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "effect_hair", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "eff_hair");
        RNA_def_property_range(prop, 0.0f, 1.0f);
        RNA_def_property_ui_text(prop, "Stiffness", "Hair stiffness for effectors");
        RNA_def_property_update(prop, 0, "rna_Particle_redo");

        prop= RNA_def_property(srna, "count", PROP_INT, PROP_UNSIGNED);
        RNA_def_property_int_sdna(prop, NULL, "totpart");
        RNA_def_property_clear_flag(prop, PROP_ANIMATABLE);
        /* This limit is for those freaks who have the machine power to handle it. */
        /* 10M particles take around 2.2 Gb of memory / disk space in saved file and */
        /* each cached frame takes around 0.5 Gb of memory / disk space depending on cache mode. */
        RNA_def_property_range(prop, 0, 10000000);
        RNA_def_property_ui_range(prop, 0, 100000, 1, 0);
        RNA_def_property_ui_text(prop, "Amount", "Total number of particles");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "userjit", PROP_INT, PROP_UNSIGNED);//TODO: can we get a better name for userjit?
        RNA_def_property_int_sdna(prop, NULL, "userjit");
        RNA_def_property_clear_flag(prop, PROP_ANIMATABLE);
        RNA_def_property_range(prop, 0, 1000);
        RNA_def_property_ui_text(prop, "P/F", "Emission locations / face (0 = automatic)");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "grid_resolution", PROP_INT, PROP_UNSIGNED);
        RNA_def_property_int_sdna(prop, NULL, "grid_res");
        RNA_def_property_clear_flag(prop, PROP_ANIMATABLE);
        RNA_def_property_range(prop, 1, 250); /* ~15M particles in a cube (ouch!), but could be very usable in a plane */
        RNA_def_property_ui_range(prop, 1, 50, 1, 0); /* ~100k particles in a cube */
        RNA_def_property_ui_text(prop, "Resolution", "The resolution of the particle grid");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "grid_random", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "grid_rand");
        RNA_def_property_range(prop, 0.0f, 1.0f);
        RNA_def_property_ui_text(prop, "Grid Randomness", "Add random offset to the grid locations");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "effector_amount", PROP_INT, PROP_UNSIGNED);
        /* in theory PROP_ANIMATABLE perhaps should be cleared, but animating this can give some interesting results! */
        RNA_def_property_range(prop, 0, 10000); /* 10000 effectors will bel SLOW, but who knows */
        RNA_def_property_ui_range(prop, 0, 100, 1, 0);
        RNA_def_property_ui_text(prop, "Effector Amount", "How many particles are effectors (0 is all particles)");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        /* initial velocity factors */
        prop= RNA_def_property(srna, "normal_factor", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "normfac");//optional if prop names are the same
        RNA_def_property_range(prop, -1000.0f, 1000.0f);
        RNA_def_property_ui_range(prop, 0, 100, 1, 3);
        RNA_def_property_ui_text(prop, "Normal", "Let the surface normal give the particle a starting speed");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "object_factor", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "obfac");
        RNA_def_property_range(prop, -200.0f, 200.0f);
        RNA_def_property_ui_range(prop, -1.0f, 1.0f, 0.1, 3);
        RNA_def_property_ui_text(prop, "Object", "Let the object give the particle a starting speed");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "factor_random", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "randfac");//optional if prop names are the same
        RNA_def_property_range(prop, 0.0f, 200.0f);
        RNA_def_property_ui_range(prop, 0, 100, 1, 3);
        RNA_def_property_ui_text(prop, "Random", "Give the starting speed a random variation");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "particle_factor", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "partfac");
        RNA_def_property_range(prop, -200.0f, 200.0f);
        RNA_def_property_ui_range(prop, -1.0f, 1.0f, 0.1, 3);
        RNA_def_property_ui_text(prop, "Particle", "Let the target particle give the particle a starting speed");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "tangent_factor", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "tanfac");
        RNA_def_property_range(prop, -1000.0f, 1000.0f);
        RNA_def_property_ui_range(prop, -100, 100, 1, 2);
        RNA_def_property_ui_text(prop, "Tangent", "Let the surface tangent give the particle a starting speed");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "tangent_phase", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "tanphase");
        RNA_def_property_range(prop, -1.0f, 1.0f);
        RNA_def_property_ui_text(prop, "Rot", "Rotate the surface tangent");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "reactor_factor", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "reactfac");
        RNA_def_property_range(prop, -10.0f, 10.0f);
        RNA_def_property_ui_text(prop, "Reactor", "Let the vector away from the target particles location give the particle a starting speed");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "object_align_factor", PROP_FLOAT, PROP_VELOCITY);
        RNA_def_property_float_sdna(prop, NULL, "ob_vel");
        RNA_def_property_array(prop, 3);
        RNA_def_property_range(prop, -200.0f, 200.0f);
        RNA_def_property_ui_range(prop, -100, 100, 1, 3);
        RNA_def_property_ui_text(prop, "Object Aligned", "Let the emitter object orientation give the particle a starting speed");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "angular_velocity_factor", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "avefac");
        RNA_def_property_range(prop, -200.0f, 200.0f);
        RNA_def_property_ui_range(prop, -100, 100, 10, 3);
        RNA_def_property_ui_text(prop, "Angular Velocity", "Angular velocity amount");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "phase_factor", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "phasefac");
        RNA_def_property_range(prop, -1.0f, 1.0f);
        RNA_def_property_ui_text(prop, "Phase", "Initial rotation phase");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "rotation_factor_random", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "randrotfac");
        RNA_def_property_range(prop, 0.0f, 1.0f);
        RNA_def_property_ui_text(prop, "Random Rotation", "Randomize rotation");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "phase_factor_random", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "randphasefac");
        RNA_def_property_range(prop, 0.0f, 1.0f);
        RNA_def_property_ui_text(prop, "Random Phase", "Randomize rotation phase");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "hair_length", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_funcs(prop, "rna_PartSetting_hairlength_get", "rna_PartSetting_hairlength_set", NULL);
        RNA_def_property_range(prop, 0.0f, 1000.0f);
        RNA_def_property_ui_range(prop, 0.0f, 10.0f, 1, 3);
        RNA_def_property_ui_text(prop, "Hair Length", "Length of the hair");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        /* physical properties */
        prop= RNA_def_property(srna, "mass", PROP_FLOAT, PROP_NONE);
        RNA_def_property_range(prop, 0.001f, 100000.0f);
        RNA_def_property_ui_range(prop, 0.01, 100, 1, 3);
        RNA_def_property_ui_text(prop, "Mass", "Specify the mass of the particles");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "particle_size", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "size");
        RNA_def_property_range(prop, 0.001f, 100000.0f);
        RNA_def_property_ui_range(prop, 0.01, 100, 1, 3);
        RNA_def_property_ui_text(prop, "Size", "The size of the particles");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "size_random", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "randsize");
        RNA_def_property_range(prop, 0.0f, 1.0f);
        RNA_def_property_ui_text(prop, "Random Size", "Give the particle size a random variation");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");


        /* global physical properties */
        prop= RNA_def_property(srna, "drag_factor", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "dragfac");
        RNA_def_property_range(prop, 0.0f, 1.0f);
        RNA_def_property_ui_text(prop, "Drag", "Specify the amount of air-drag");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "brownian_factor", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "brownfac");
        RNA_def_property_range(prop, 0.0f, 200.0f);
        RNA_def_property_ui_range(prop, 0, 20, 1, 3);
        RNA_def_property_ui_text(prop, "Brownian", "Specify the amount of Brownian motion");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "damping", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "dampfac");
        RNA_def_property_range(prop, 0.0f, 1.0f);
        RNA_def_property_ui_text(prop, "Damp", "Specify the amount of damping");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        /* random length */
        prop= RNA_def_property(srna, "length_random", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "randlength");
        RNA_def_property_range(prop, 0.0f, 1.0f);
        RNA_def_property_ui_text(prop, "Random Length", "Give path length a random variation");
        RNA_def_property_update(prop, 0, "rna_Particle_redo");

        /* children */
        prop= RNA_def_property(srna, "child_nbr", PROP_INT, PROP_NONE);
        RNA_def_property_int_sdna(prop, NULL, "child_nbr");//optional if prop names are the same
        RNA_def_property_range(prop, 0, 100000);
        RNA_def_property_ui_range(prop, 0, 1000, 1, 0);
        RNA_def_property_ui_text(prop, "Children Per Parent", "Amount of children/parent");
        RNA_def_property_update(prop, 0, "rna_Particle_redo_child");

        prop= RNA_def_property(srna, "rendered_child_count", PROP_INT, PROP_NONE);
        RNA_def_property_int_sdna(prop, NULL, "ren_child_nbr");
        RNA_def_property_range(prop, 0, 100000);
        RNA_def_property_ui_range(prop, 0, 10000, 1, 0);
        RNA_def_property_ui_text(prop, "Rendered Children", "Amount of children/parent for rendering");

        prop= RNA_def_property(srna, "virtual_parents", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "parents");
        RNA_def_property_range(prop, 0.0f, 1.0f);
        RNA_def_property_ui_text(prop, "Virtual Parents", "Relative amount of virtual parents");
        RNA_def_property_update(prop, 0, "rna_Particle_redo_child");

        prop= RNA_def_property(srna, "child_size", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "childsize");
        RNA_def_property_range(prop, 0.001f, 100000.0f);
        RNA_def_property_ui_range(prop, 0.01f, 100.0f, 0.1, 3);
        RNA_def_property_ui_text(prop, "Child Size", "A multiplier for the child particle size");
        RNA_def_property_update(prop, 0, "rna_Particle_redo_child");

        prop= RNA_def_property(srna, "child_size_random", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "childrandsize");
        RNA_def_property_range(prop, 0.0f, 1.0f);
        RNA_def_property_ui_text(prop, "Random Child Size", "Random variation to the size of the child particles");
        RNA_def_property_update(prop, 0, "rna_Particle_redo_child");

        prop= RNA_def_property(srna, "child_radius", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "childrad");
        RNA_def_property_range(prop, 0.0f, 10.0f);
        RNA_def_property_ui_text(prop, "Child Radius", "Radius of children around parent");
        RNA_def_property_update(prop, 0, "rna_Particle_redo_child");

        prop= RNA_def_property(srna, "child_roundness", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "childflat");
        RNA_def_property_range(prop, 0.0f, 1.0f);
        RNA_def_property_ui_text(prop, "Child Roundness", "Roundness of children around parent");
        RNA_def_property_update(prop, 0, "rna_Particle_redo_child");

        /* clumping */
        prop= RNA_def_property(srna, "clump_factor", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "clumpfac");
        RNA_def_property_range(prop, -1.0f, 1.0f);
        RNA_def_property_ui_text(prop, "Clump", "Amount of clumping");
        RNA_def_property_update(prop, 0, "rna_Particle_redo_child");

        prop= RNA_def_property(srna, "clump_shape", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "clumppow");
        RNA_def_property_range(prop, -0.999f, 0.999f);
        RNA_def_property_ui_text(prop, "Shape", "Shape of clumping");
        RNA_def_property_update(prop, 0, "rna_Particle_redo_child");


        /* kink */
        prop= RNA_def_property(srna, "kink_amplitude", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "kink_amp");
        RNA_def_property_range(prop, -100000.0f, 100000.0f);
        RNA_def_property_ui_range(prop, -10.0f, 10.0f, 0.1, 3);
        RNA_def_property_ui_text(prop, "Amplitude", "The amplitude of the offset");
        RNA_def_property_update(prop, 0, "rna_Particle_redo_child");

        prop= RNA_def_property(srna, "kink_amplitude_clump", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "kink_amp_clump");
        RNA_def_property_range(prop, 0.0f, 1.0f);
        RNA_def_property_ui_text(prop, "Amplitude Clump", "How much clump effects kink amplitude");
        RNA_def_property_update(prop, 0, "rna_Particle_redo_child");

        prop= RNA_def_property(srna, "kink_frequency", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "kink_freq");
        RNA_def_property_range(prop, -100000.0f, 100000.0f);
        RNA_def_property_ui_range(prop, -10.0f, 10.0f, 0.1, 3);
        RNA_def_property_ui_text(prop, "Frequency", "The frequency of the offset (1/total length)");
        RNA_def_property_update(prop, 0, "rna_Particle_redo_child");

        prop= RNA_def_property(srna, "kink_shape", PROP_FLOAT, PROP_NONE);
        RNA_def_property_range(prop, -0.999f, 0.999f);
        RNA_def_property_ui_text(prop, "Shape", "Adjust the offset to the beginning/end");
        RNA_def_property_update(prop, 0, "rna_Particle_redo_child");

        prop= RNA_def_property(srna, "kink_flat", PROP_FLOAT, PROP_NONE);
        RNA_def_property_range(prop, 0.0f, 1.0f);
        RNA_def_property_ui_text(prop, "Flatness", "How flat the hairs are");
        RNA_def_property_update(prop, 0, "rna_Particle_redo_child");

        /* rough */
        prop= RNA_def_property(srna, "roughness_1", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "rough1");
        RNA_def_property_range(prop, 0.0f, 100000.0f);
        RNA_def_property_ui_range(prop, 0.0f, 10.0f, 0.1, 3);
        RNA_def_property_ui_text(prop, "Rough1", "Amount of location dependent rough");
        RNA_def_property_update(prop, 0, "rna_Particle_redo_child");

        prop= RNA_def_property(srna, "roughness_1_size", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "rough1_size");
        RNA_def_property_range(prop, 0.01f, 100000.0f);
        RNA_def_property_ui_range(prop, 0.01f, 10.0f, 0.1, 3);
        RNA_def_property_ui_text(prop, "Size1", "Size of location dependent rough");
        RNA_def_property_update(prop, 0, "rna_Particle_redo_child");

        prop= RNA_def_property(srna, "roughness_2", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "rough2");
        RNA_def_property_range(prop, 0.0f, 100000.0f);
        RNA_def_property_ui_range(prop, 0.0f, 10.0f, 0.1, 3);
        RNA_def_property_ui_text(prop, "Rough2", "Amount of random rough");
        RNA_def_property_update(prop, 0, "rna_Particle_redo_child");

        prop= RNA_def_property(srna, "roughness_2_size", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "rough2_size");
        RNA_def_property_range(prop, 0.01f, 100000.0f);
        RNA_def_property_ui_range(prop, 0.01f, 10.0f, 0.1, 3);
        RNA_def_property_ui_text(prop, "Size2", "Size of random rough");
        RNA_def_property_update(prop, 0, "rna_Particle_redo_child");

        prop= RNA_def_property(srna, "roughness_2_threshold", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "rough2_thres");
        RNA_def_property_range(prop, 0.0f, 1.0f);
        RNA_def_property_ui_text(prop, "Threshold", "Amount of particles left untouched by random rough");
        RNA_def_property_update(prop, 0, "rna_Particle_redo_child");

        prop= RNA_def_property(srna, "roughness_endpoint", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "rough_end");
        RNA_def_property_range(prop, 0.0f, 100000.0f);
        RNA_def_property_ui_range(prop, 0.0f, 10.0f, 0.1, 3);
        RNA_def_property_ui_text(prop, "Rough Endpoint", "Amount of end point rough");
        RNA_def_property_update(prop, 0, "rna_Particle_redo_child");

        prop= RNA_def_property(srna, "roughness_end_shape", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "rough_end_shape");
        RNA_def_property_range(prop, 0.0f, 10.0f);
        RNA_def_property_ui_text(prop, "Shape", "Shape of end point rough");
        RNA_def_property_update(prop, 0, "rna_Particle_redo_child");

        prop= RNA_def_property(srna, "child_length", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "clength");
        RNA_def_property_range(prop, 0.0f, 1.0f);
        RNA_def_property_ui_text(prop, "Length", "Length of child paths");
        RNA_def_property_update(prop, 0, "rna_Particle_redo_child");

        prop= RNA_def_property(srna, "child_length_threshold", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "clength_thres");
        RNA_def_property_range(prop, 0.0f, 1.0f);
        RNA_def_property_ui_text(prop, "Threshold", "Amount of particles left untouched by child path length");
        RNA_def_property_update(prop, 0, "rna_Particle_redo_child");

        /* parting */
        prop= RNA_def_property(srna, "child_parting_factor", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "parting_fac");
        RNA_def_property_range(prop, 0.0f, 1.0f);
        RNA_def_property_ui_text(prop, "Parting Factor", "Create parting in the children based on parent strands");
        RNA_def_property_update(prop, 0, "rna_Particle_redo_child");

        prop= RNA_def_property(srna, "child_parting_min", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "parting_min");
        RNA_def_property_range(prop, 0.0f, 180.0f);
        RNA_def_property_ui_text(prop, "Parting Minimum", "Minimum root to tip angle (tip distance/root distance for long hair)");
        RNA_def_property_update(prop, 0, "rna_Particle_redo_child");

        prop= RNA_def_property(srna, "child_parting_max", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "parting_max");
        RNA_def_property_range(prop, 0.0f, 180.0f);
        RNA_def_property_ui_text(prop, "Parting Maximum", "Maximum root to tip angle (tip distance/root distance for long hair)");
        RNA_def_property_update(prop, 0, "rna_Particle_redo_child");

        /* branching */
        prop= RNA_def_property(srna, "branch_threshold", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "branch_thres");
        RNA_def_property_range(prop, 0.0f, 1.0f);
        RNA_def_property_ui_text(prop, "Threshold", "Threshold of branching");
        RNA_def_property_update(prop, 0, "rna_Particle_redo_child");

        /* drawing stuff */
        prop= RNA_def_property(srna, "line_length_tail", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_funcs(prop, "rna_PartSetting_linelentail_get", "rna_PartSetting_linelentail_set", NULL);
        RNA_def_property_range(prop, 0.0f, 100000.0f);
        RNA_def_property_ui_range(prop, 0.0f, 10.0f, 0.1, 3);
        RNA_def_property_ui_text(prop, "Back", "Length of the line's tail");
        RNA_def_property_update(prop, 0, "rna_Particle_redo");

        prop= RNA_def_property(srna, "line_length_head", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_funcs(prop, "rna_PartSetting_linelenhead_get", "rna_PartSetting_linelenhead_set", NULL);
        RNA_def_property_range(prop, 0.0f, 100000.0f);
        RNA_def_property_ui_range(prop, 0.0f, 10.0f, 0.1, 3);
        RNA_def_property_ui_text(prop, "Head", "Length of the line's head");
        RNA_def_property_update(prop, 0, "rna_Particle_redo");

        prop= RNA_def_property(srna, "path_start", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "path_start");
        RNA_def_property_float_funcs(prop, NULL, NULL, "rna_PartSetting_pathstartend_range");
        RNA_def_property_ui_text(prop, "Path Start", "Starting time of drawn path");
        RNA_def_property_update(prop, 0, "rna_Particle_redo");

        prop= RNA_def_property(srna, "path_end", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "path_end");
        RNA_def_property_float_funcs(prop, NULL, NULL, "rna_PartSetting_pathstartend_range");
        RNA_def_property_ui_text(prop, "Path End", "End time of drawn path");
        RNA_def_property_update(prop, 0, "rna_Particle_redo");

        prop= RNA_def_property(srna, "trail_count", PROP_INT, PROP_NONE);
        RNA_def_property_int_sdna(prop, NULL, "trail_count");
        RNA_def_property_range(prop, 1, 100000);
        RNA_def_property_ui_range(prop, 1, 100, 1, 0);
        RNA_def_property_ui_text(prop, "Trail Count", "Number of trail particles");
        RNA_def_property_update(prop, 0, "rna_Particle_redo");

        /* keyed particles */
        prop= RNA_def_property(srna, "keyed_loops", PROP_INT, PROP_NONE);
        RNA_def_property_int_sdna(prop, NULL, "keyed_loops");
        RNA_def_property_range(prop, 1.0f, 10000.0f);
        RNA_def_property_ui_range(prop, 1.0f, 100.0f, 0.1, 3);
        RNA_def_property_ui_text(prop, "Loop count", "Number of times the keys are looped");
        RNA_def_property_update(prop, 0, "rna_Particle_redo");
        
        /* draw objects & groups */
        prop= RNA_def_property(srna, "dupli_group", PROP_POINTER, PROP_NONE);
        RNA_def_property_pointer_sdna(prop, NULL, "dup_group");
        RNA_def_property_struct_type(prop, "Group");
        RNA_def_property_flag(prop, PROP_EDITABLE);
        RNA_def_property_ui_text(prop, "Dupli Group", "Show Objects in this Group in place of particles");
        RNA_def_property_update(prop, 0, "rna_Particle_redo");

        prop= RNA_def_property(srna, "dupli_weights", PROP_COLLECTION, PROP_NONE);
        RNA_def_property_collection_sdna(prop, NULL, "dupliweights", NULL);
        RNA_def_property_struct_type(prop, "ParticleDupliWeight");
        RNA_def_property_ui_text(prop, "Dupli Group Weights", "Weights for all of the objects in the dupli group");

        prop= RNA_def_property(srna, "active_dupliweight", PROP_POINTER, PROP_NONE);
        RNA_def_property_struct_type(prop, "ParticleDupliWeight");
        RNA_def_property_pointer_funcs(prop, "rna_ParticleDupliWeight_active_get", NULL, NULL, NULL);
        RNA_def_property_ui_text(prop, "Active Dupli Object", "");

        prop= RNA_def_property(srna, "active_dupliweight_index", PROP_INT, PROP_UNSIGNED);
        RNA_def_property_int_funcs(prop, "rna_ParticleDupliWeight_active_index_get", "rna_ParticleDupliWeight_active_index_set", "rna_ParticleDupliWeight_active_index_range");
        RNA_def_property_ui_text(prop, "Active Dupli Object Index", "");

        prop= RNA_def_property(srna, "dupli_object", PROP_POINTER, PROP_NONE);
        RNA_def_property_pointer_sdna(prop, NULL, "dup_ob");
        RNA_def_property_struct_type(prop, "Object");
        RNA_def_property_flag(prop, PROP_EDITABLE);
        RNA_def_property_ui_text(prop, "Dupli Object", "Show this Object in place of particles");
        RNA_def_property_update(prop, 0, "rna_Particle_redo_dependency");

        prop= RNA_def_property(srna, "billboard_object", PROP_POINTER, PROP_NONE);
        RNA_def_property_pointer_sdna(prop, NULL, "bb_ob");
        RNA_def_property_struct_type(prop, "Object");
        RNA_def_property_flag(prop, PROP_EDITABLE);
        RNA_def_property_ui_text(prop, "Billboard Object", "Billboards face this object (default is active camera)");
        RNA_def_property_update(prop, 0, "rna_Particle_redo");

        /* boids */
        prop= RNA_def_property(srna, "boids", PROP_POINTER, PROP_NONE);
        RNA_def_property_struct_type(prop, "BoidSettings");
        RNA_def_property_clear_flag(prop, PROP_EDITABLE);
        RNA_def_property_ui_text(prop, "Boid Settings", "");
        
        /* Fluid particles */
        prop= RNA_def_property(srna, "fluid", PROP_POINTER, PROP_NONE);
        RNA_def_property_struct_type(prop, "SPHFluidSettings");
        RNA_def_property_clear_flag(prop, PROP_EDITABLE);
        RNA_def_property_ui_text(prop, "SPH Fluid Settings", ""); 

        /* Effector weights */
        prop= RNA_def_property(srna, "effector_weights", PROP_POINTER, PROP_NONE);
        RNA_def_property_struct_type(prop, "EffectorWeights");
        RNA_def_property_clear_flag(prop, PROP_EDITABLE);
        RNA_def_property_ui_text(prop, "Effector Weights", "");
        
        /* animation here? */
        rna_def_animdata_common(srna);

        prop= RNA_def_property(srna, "force_field_1", PROP_POINTER, PROP_NONE);
        RNA_def_property_pointer_sdna(prop, NULL, "pd");
        RNA_def_property_struct_type(prop, "FieldSettings");
        RNA_def_property_pointer_funcs(prop, "rna_Particle_field1_get", NULL, NULL, NULL);
        RNA_def_property_ui_text(prop, "Force Field 1", "");

        prop= RNA_def_property(srna, "force_field_2", PROP_POINTER, PROP_NONE);
        RNA_def_property_pointer_sdna(prop, NULL, "pd2");
        RNA_def_property_struct_type(prop, "FieldSettings");
        RNA_def_property_pointer_funcs(prop, "rna_Particle_field2_get", NULL, NULL, NULL);
        RNA_def_property_ui_text(prop, "Force Field 2", "");
}

static void rna_def_particle_target(BlenderRNA *brna)
{
        StructRNA *srna;
        PropertyRNA *prop;

        static EnumPropertyItem mode_items[] = {
                {PTARGET_MODE_FRIEND, "FRIEND", 0, "Friend", ""},
                {PTARGET_MODE_NEUTRAL, "NEUTRAL", 0, "Neutral", ""},
                {PTARGET_MODE_ENEMY, "ENEMY", 0, "Enemy", ""},
                {0, NULL, 0, NULL, NULL}
        };


        srna = RNA_def_struct(brna, "ParticleTarget", NULL);
        RNA_def_struct_ui_text(srna, "Particle Target", "Target particle system");

        prop= RNA_def_property(srna, "name", PROP_STRING, PROP_NONE);
        RNA_def_property_string_funcs(prop, "rna_ParticleTarget_name_get", "rna_ParticleTarget_name_length", NULL);
        RNA_def_property_ui_text(prop, "Name", "Particle target name");
        RNA_def_property_clear_flag(prop, PROP_EDITABLE);
        RNA_def_struct_name_property(srna, prop);

        prop= RNA_def_property(srna, "object", PROP_POINTER, PROP_NONE);
        RNA_def_property_pointer_sdna(prop, NULL, "ob");
        RNA_def_property_flag(prop, PROP_EDITABLE);
        RNA_def_property_ui_text(prop, "Target Object", "The object that has the target particle system (empty if same object)");
        RNA_def_property_update(prop, 0, "rna_Particle_target_reset");

        prop= RNA_def_property(srna, "system", PROP_INT, PROP_UNSIGNED);
        RNA_def_property_int_sdna(prop, NULL, "psys");
        RNA_def_property_range(prop, 1, INT_MAX);
        RNA_def_property_ui_text(prop, "Target Particle System", "The index of particle system on the target object");
        RNA_def_property_update(prop, 0, "rna_Particle_target_reset");

        prop= RNA_def_property(srna, "time", PROP_FLOAT, PROP_TIME);
        RNA_def_property_float_sdna(prop, NULL, "time");
        RNA_def_property_range(prop, 0.0, 30000.0f); //TODO: replace 30000 with MAXFRAMEF when available in 2.5
        RNA_def_property_ui_text(prop, "Time", "");
        RNA_def_property_update(prop, 0, "rna_Particle_target_redo");

        prop= RNA_def_property(srna, "duration", PROP_FLOAT, PROP_NONE);
        RNA_def_property_float_sdna(prop, NULL, "duration");
        RNA_def_property_range(prop, 0.0, 30000.0f); //TODO: replace 30000 with MAXFRAMEF when available in 2.5
        RNA_def_property_ui_text(prop, "Duration", "");
        RNA_def_property_update(prop, 0, "rna_Particle_target_redo");

        prop= RNA_def_property(srna, "is_valid", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_sdna(prop, NULL, "flag", PTARGET_VALID);
        RNA_def_property_clear_flag(prop, PROP_ANIMATABLE);
        RNA_def_property_ui_text(prop, "Valid", "Keyed particles target is valid");

        prop= RNA_def_property(srna, "alliance", PROP_ENUM, PROP_NONE);
        RNA_def_property_enum_sdna(prop, NULL, "mode");
        RNA_def_property_enum_items(prop, mode_items);
        RNA_def_property_clear_flag(prop, PROP_ANIMATABLE);
        RNA_def_property_ui_text(prop, "Mode", "");
        RNA_def_property_update(prop, 0, "rna_Particle_target_reset");

}
static void rna_def_particle_system(BlenderRNA *brna)
{
        StructRNA *srna;
        PropertyRNA *prop;

        srna= RNA_def_struct(brna, "ParticleSystem", NULL);
        RNA_def_struct_ui_text(srna, "Particle System", "Particle system in an object");
        RNA_def_struct_ui_icon(srna, ICON_PARTICLE_DATA);

        prop= RNA_def_property(srna, "name", PROP_STRING, PROP_NONE);
        RNA_def_property_ui_text(prop, "Name", "Particle system name");
        RNA_def_property_update(prop, NC_OBJECT|ND_MODIFIER|NA_RENAME, NULL);
        RNA_def_struct_name_property(srna, prop);

        /* access to particle settings is redirected through functions */
        /* to allow proper id-buttons functionality */
        prop= RNA_def_property(srna, "settings", PROP_POINTER, PROP_NONE);
        //RNA_def_property_pointer_sdna(prop, NULL, "part");
        RNA_def_property_struct_type(prop, "ParticleSettings");
        RNA_def_property_flag(prop, PROP_EDITABLE|PROP_NEVER_NULL);
        RNA_def_property_pointer_funcs(prop, "rna_particle_settings_get", "rna_particle_settings_set", NULL, NULL);
        RNA_def_property_ui_text(prop, "Settings", "Particle system settings");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "particles", PROP_COLLECTION, PROP_NONE);
        RNA_def_property_collection_sdna(prop, NULL, "particles", "totpart");
        RNA_def_property_struct_type(prop, "Particle");
        RNA_def_property_ui_text(prop, "Particles", "Particles generated by the particle system");

        prop= RNA_def_property(srna, "child_particles", PROP_COLLECTION, PROP_NONE);
        RNA_def_property_collection_sdna(prop, NULL, "child", "totchild");
        RNA_def_property_struct_type(prop, "ChildParticle");
        RNA_def_property_ui_text(prop, "Child Particles", "Child particles generated by the particle system");

        prop= RNA_def_property(srna, "seed", PROP_INT, PROP_UNSIGNED);
        RNA_def_property_ui_text(prop, "Seed", "Offset in the random number table, to get a different randomized result");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "child_seed", PROP_INT, PROP_UNSIGNED);
        RNA_def_property_ui_text(prop, "Child Seed", "Offset in the random number table for child particles, to get a different randomized result");
        RNA_def_property_update(prop, 0, "rna_Particle_redo_child");

        /* hair */
        prop= RNA_def_property(srna, "is_global_hair", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_sdna(prop, NULL, "flag", PSYS_GLOBAL_HAIR);
        RNA_def_property_clear_flag(prop, PROP_EDITABLE);
        RNA_def_property_ui_text(prop, "Global Hair", "Hair keys are in global coordinate space");

        prop= RNA_def_property(srna, "use_hair_dynamics", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_sdna(prop, NULL, "flag", PSYS_HAIR_DYNAMICS);
        RNA_def_property_ui_text(prop, "Hair Dynamics", "Enable hair dynamics using cloth simulation");
        RNA_def_property_update(prop, 0, "rna_Particle_hair_dynamics");

        prop= RNA_def_property(srna, "cloth", PROP_POINTER, PROP_NONE);
        RNA_def_property_pointer_sdna(prop, NULL, "clmd");
        RNA_def_property_struct_type(prop, "ClothModifier");
        RNA_def_property_flag(prop, PROP_NEVER_NULL);
        RNA_def_property_clear_flag(prop, PROP_EDITABLE);
        RNA_def_property_ui_text(prop, "Cloth", "Cloth dynamics for hair");

        /* reactor */
        prop= RNA_def_property(srna, "reactor_target_object", PROP_POINTER, PROP_NONE);
        RNA_def_property_pointer_sdna(prop, NULL, "target_ob");
        RNA_def_property_flag(prop, PROP_EDITABLE);
        RNA_def_property_ui_text(prop, "Reactor Target Object", "For reactor systems, the object that has the target particle system (empty if same object)");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "reactor_target_particle_system", PROP_INT, PROP_UNSIGNED);
        RNA_def_property_int_sdna(prop, NULL, "target_psys");
        RNA_def_property_range(prop, 1, SHRT_MAX);
        RNA_def_property_ui_text(prop, "Reactor Target Particle System", "For reactor systems, index of particle system on the target object");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        /* keyed */
        prop= RNA_def_property(srna, "use_keyed_timing", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_sdna(prop, NULL, "flag", PSYS_KEYED_TIMING);
        RNA_def_property_clear_flag(prop, PROP_ANIMATABLE);
        RNA_def_property_ui_text(prop, "Keyed timing", "Use key times");
        RNA_def_property_update(prop, 0, "rna_Particle_redo");

        prop= RNA_def_property(srna, "targets", PROP_COLLECTION, PROP_NONE);
        RNA_def_property_struct_type(prop, "ParticleTarget");
        RNA_def_property_ui_text(prop, "Targets", "Target particle systems");

        prop= RNA_def_property(srna, "active_particle_target", PROP_POINTER, PROP_NONE);
        RNA_def_property_struct_type(prop, "ParticleTarget");
        RNA_def_property_pointer_funcs(prop, "rna_ParticleSystem_active_particle_target_get", NULL, NULL, NULL);
        RNA_def_property_ui_text(prop, "Active Particle Target", "");

        prop= RNA_def_property(srna, "active_particle_target_index", PROP_INT, PROP_UNSIGNED);
        RNA_def_property_int_funcs(prop, "rna_ParticleSystem_active_particle_target_index_get", "rna_ParticleSystem_active_particle_target_index_set", "rna_ParticleSystem_active_particle_target_index_range");
        RNA_def_property_ui_text(prop, "Active Particle Target Index", "");


        /* billboard */
        prop= RNA_def_property(srna, "billboard_normal_uv", PROP_STRING, PROP_NONE);
        RNA_def_property_string_sdna(prop, NULL, "bb_uvname[0]");
        RNA_def_property_string_maxlength(prop, 32);
        RNA_def_property_ui_text(prop, "Billboard Normal UV", "UV Layer to control billboard normals");

        prop= RNA_def_property(srna, "billboard_time_index_uv", PROP_STRING, PROP_NONE);
        RNA_def_property_string_sdna(prop, NULL, "bb_uvname[1]");
        RNA_def_property_string_maxlength(prop, 32);
        RNA_def_property_ui_text(prop, "Billboard Time Index UV", "UV Layer to control billboard time index (X-Y)");

        prop= RNA_def_property(srna, "billboard_split_uv", PROP_STRING, PROP_NONE);
        RNA_def_property_string_sdna(prop, NULL, "bb_uvname[2]");
        RNA_def_property_string_maxlength(prop, 32);
        RNA_def_property_ui_text(prop, "Billboard Split UV", "UV Layer to control billboard splitting");

        /* vertex groups */

        /* note, internally store as ints, access as strings */
#if 0 // int access. works ok but isnt useful for the UI
        prop= RNA_def_property(srna, "vertex_group_density", PROP_INT, PROP_NONE);
        RNA_def_property_int_sdna(prop, NULL, "vgroup[0]");
        RNA_def_property_ui_text(prop, "Vertex Group Density", "Vertex group to control density");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");
#endif

        prop= RNA_def_property(srna, "vertex_group_density", PROP_STRING, PROP_NONE);
        RNA_def_property_string_funcs(prop, "rna_ParticleVGroup_name_get_0", "rna_ParticleVGroup_name_len_0", "rna_ParticleVGroup_name_set_0");
        RNA_def_property_ui_text(prop, "Vertex Group Density", "Vertex group to control density");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "invert_vertex_group_density", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_sdna(prop, NULL, "vg_neg", (1 << PSYS_VG_DENSITY));
        RNA_def_property_ui_text(prop, "Vertex Group Density Negate", "Negate the effect of the density vertex group");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "vertex_group_velocity", PROP_STRING, PROP_NONE);
        RNA_def_property_string_funcs(prop, "rna_ParticleVGroup_name_get_1", "rna_ParticleVGroup_name_len_1", "rna_ParticleVGroup_name_set_1");
        RNA_def_property_ui_text(prop, "Vertex Group Velocity", "Vertex group to control velocity");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "invert_vertex_group_velocity", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_sdna(prop, NULL, "vg_neg", (1 << PSYS_VG_VEL));
        RNA_def_property_ui_text(prop, "Vertex Group Velocity Negate", "Negate the effect of the velocity vertex group");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "vertex_group_length", PROP_STRING, PROP_NONE);
        RNA_def_property_string_funcs(prop, "rna_ParticleVGroup_name_get_2", "rna_ParticleVGroup_name_len_2", "rna_ParticleVGroup_name_set_2");
        RNA_def_property_ui_text(prop, "Vertex Group Length", "Vertex group to control length");
        RNA_def_property_update(prop, 0, "rna_Particle_redo");

        prop= RNA_def_property(srna, "invert_vertex_group_length", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_sdna(prop, NULL, "vg_neg", (1 << PSYS_VG_LENGTH));
        RNA_def_property_ui_text(prop, "Vertex Group Length Negate", "Negate the effect of the length vertex group");
        RNA_def_property_update(prop, 0, "rna_Particle_redo");

        prop= RNA_def_property(srna, "vertex_group_clump", PROP_STRING, PROP_NONE);
        RNA_def_property_string_funcs(prop, "rna_ParticleVGroup_name_get_3", "rna_ParticleVGroup_name_len_3", "rna_ParticleVGroup_name_set_3");
        RNA_def_property_ui_text(prop, "Vertex Group Clump", "Vertex group to control clump");
        RNA_def_property_update(prop, 0, "rna_Particle_redo_child");

        prop= RNA_def_property(srna, "invert_vertex_group_clump", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_sdna(prop, NULL, "vg_neg", (1 << PSYS_VG_CLUMP));
        RNA_def_property_ui_text(prop, "Vertex Group Clump Negate", "Negate the effect of the clump vertex group");
        RNA_def_property_update(prop, 0, "rna_Particle_redo_child");

        prop= RNA_def_property(srna, "vertex_group_kink", PROP_STRING, PROP_NONE);
        RNA_def_property_string_funcs(prop, "rna_ParticleVGroup_name_get_4", "rna_ParticleVGroup_name_len_4", "rna_ParticleVGroup_name_set_4");
        RNA_def_property_ui_text(prop, "Vertex Group Kink", "Vertex group to control kink");
        RNA_def_property_update(prop, 0, "rna_Particle_redo_child");

        prop= RNA_def_property(srna, "invert_vertex_group_kink", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_sdna(prop, NULL, "vg_neg", (1 << PSYS_VG_KINK));
        RNA_def_property_ui_text(prop, "Vertex Group Kink Negate", "Negate the effect of the kink vertex group");
        RNA_def_property_update(prop, 0, "rna_Particle_redo_child");

        prop= RNA_def_property(srna, "vertex_group_roughness_1", PROP_STRING, PROP_NONE);
        RNA_def_property_string_funcs(prop, "rna_ParticleVGroup_name_get_5", "rna_ParticleVGroup_name_len_5", "rna_ParticleVGroup_name_set_5");
        RNA_def_property_ui_text(prop, "Vertex Group Roughness 1", "Vertex group to control roughness 1");
        RNA_def_property_update(prop, 0, "rna_Particle_redo_child");

        prop= RNA_def_property(srna, "invert_vertex_group_roughness_1", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_sdna(prop, NULL, "vg_neg", (1 << PSYS_VG_ROUGH1));
        RNA_def_property_ui_text(prop, "Vertex Group Roughness 1 Negate", "Negate the effect of the roughness 1 vertex group");
        RNA_def_property_update(prop, 0, "rna_Particle_redo_child");

        prop= RNA_def_property(srna, "vertex_group_roughness_2", PROP_STRING, PROP_NONE);
        RNA_def_property_string_funcs(prop, "rna_ParticleVGroup_name_get_6", "rna_ParticleVGroup_name_len_6", "rna_ParticleVGroup_name_set_6");
        RNA_def_property_ui_text(prop, "Vertex Group Roughness 2", "Vertex group to control roughness 2");
        RNA_def_property_update(prop, 0, "rna_Particle_redo_child");

        prop= RNA_def_property(srna, "invert_vertex_group_roughness_2", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_sdna(prop, NULL, "vg_neg", (1 << PSYS_VG_ROUGH2));
        RNA_def_property_ui_text(prop, "Vertex Group Roughness 2 Negate", "Negate the effect of the roughness 2 vertex group");
        RNA_def_property_update(prop, 0, "rna_Particle_redo_child");

        prop= RNA_def_property(srna, "vertex_group_roughness_end", PROP_STRING, PROP_NONE);
        RNA_def_property_string_funcs(prop, "rna_ParticleVGroup_name_get_7", "rna_ParticleVGroup_name_len_7", "rna_ParticleVGroup_name_set_7");
        RNA_def_property_ui_text(prop, "Vertex Group Roughness End", "Vertex group to control roughness end");
        RNA_def_property_update(prop, 0, "rna_Particle_redo_child");

        prop= RNA_def_property(srna, "invert_vertex_group_roughness_end", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_sdna(prop, NULL, "vg_neg", (1 << PSYS_VG_ROUGHE));
        RNA_def_property_ui_text(prop, "Vertex Group Roughness End Negate", "Negate the effect of the roughness end vertex group");
        RNA_def_property_update(prop, 0, "rna_Particle_redo_child");

        prop= RNA_def_property(srna, "vertex_group_size", PROP_STRING, PROP_NONE);
        RNA_def_property_string_funcs(prop, "rna_ParticleVGroup_name_get_8", "rna_ParticleVGroup_name_len_8", "rna_ParticleVGroup_name_set_8");
        RNA_def_property_ui_text(prop, "Vertex Group Size", "Vertex group to control size");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "invert_vertex_group_size", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_sdna(prop, NULL, "vg_neg", (1 << PSYS_VG_SIZE));
        RNA_def_property_ui_text(prop, "Vertex Group Size Negate", "Negate the effect of the size vertex group");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "vertex_group_tangent", PROP_STRING, PROP_NONE);
        RNA_def_property_string_funcs(prop, "rna_ParticleVGroup_name_get_9", "rna_ParticleVGroup_name_len_9", "rna_ParticleVGroup_name_set_9");
        RNA_def_property_ui_text(prop, "Vertex Group Tangent", "Vertex group to control tangent");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "invert_vertex_group_tangent", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_sdna(prop, NULL, "vg_neg", (1 << PSYS_VG_TAN));
        RNA_def_property_ui_text(prop, "Vertex Group Tangent Negate", "Negate the effect of the tangent vertex group");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "vertex_group_rotation", PROP_STRING, PROP_NONE);
        RNA_def_property_string_funcs(prop, "rna_ParticleVGroup_name_get_10", "rna_ParticleVGroup_name_len_10", "rna_ParticleVGroup_name_set_10");
        RNA_def_property_ui_text(prop, "Vertex Group Rotation", "Vertex group to control rotation");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "invert_vertex_group_rotation", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_sdna(prop, NULL, "vg_neg", (1 << PSYS_VG_ROT));
        RNA_def_property_ui_text(prop, "Vertex Group Rotation Negate", "Negate the effect of the rotation vertex group");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "vertex_group_field", PROP_STRING, PROP_NONE);
        RNA_def_property_string_funcs(prop, "rna_ParticleVGroup_name_get_11", "rna_ParticleVGroup_name_len_11", "rna_ParticleVGroup_name_set_11");
        RNA_def_property_ui_text(prop, "Vertex Group Field", "Vertex group to control field");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        prop= RNA_def_property(srna, "invert_vertex_group_field", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_sdna(prop, NULL, "vg_neg", (1 << PSYS_VG_EFFECTOR));
        RNA_def_property_ui_text(prop, "Vertex Group Field Negate", "Negate the effect of the field vertex group");
        RNA_def_property_update(prop, 0, "rna_Particle_reset");

        /* pointcache */
        prop= RNA_def_property(srna, "point_cache", PROP_POINTER, PROP_NONE);
        RNA_def_property_flag(prop, PROP_NEVER_NULL);
        RNA_def_property_pointer_sdna(prop, NULL, "pointcache");
        RNA_def_property_struct_type(prop, "PointCache");
        RNA_def_property_ui_text(prop, "Point Cache", "");

        prop= RNA_def_property(srna, "has_multiple_caches", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_funcs(prop, "rna_ParticleSystem_multiple_caches_get", NULL);
        RNA_def_property_clear_flag(prop, PROP_EDITABLE);
        RNA_def_property_ui_text(prop, "Multiple Caches", "Particle system has multiple point caches");

        /* offset ob */
        prop= RNA_def_property(srna, "parent", PROP_POINTER, PROP_NONE);
        RNA_def_property_pointer_sdna(prop, NULL, "parent");
        RNA_def_property_flag(prop, PROP_EDITABLE);
        RNA_def_property_ui_text(prop, "Parent", "Use this object's coordinate system instead of global coordinate system");
        RNA_def_property_update(prop, 0, "rna_Particle_redo");

        /* hair or cache editing */
        prop= RNA_def_property(srna, "is_editable", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_funcs(prop, "rna_ParticleSystem_editable_get", NULL);
        RNA_def_property_clear_flag(prop, PROP_EDITABLE);
        RNA_def_property_ui_text(prop, "Editable", "Particle system can be edited in particle mode");

        prop= RNA_def_property(srna, "is_edited", PROP_BOOLEAN, PROP_NONE);
        RNA_def_property_boolean_funcs(prop, "rna_ParticleSystem_edited_get", NULL);
        RNA_def_property_clear_flag(prop, PROP_EDITABLE);
        RNA_def_property_ui_text(prop, "Edited", "Particle system has been edited in particle mode");


        RNA_def_struct_path_func(srna, "rna_ParticleSystem_path");
}

void RNA_def_particle(BlenderRNA *brna)
{
        rna_def_particle_target(brna);
        rna_def_fluid_settings(brna);
        rna_def_particle_hair_key(brna);
        rna_def_particle_key(brna);
        
        rna_def_child_particle(brna);
        rna_def_particle(brna);
        rna_def_particle_dupliweight(brna);
        rna_def_particle_system(brna);
        rna_def_particle_settings_mtex(brna);
        rna_def_particle_settings(brna);        
}

#endif