mesh.c

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/*  mesh.c
 *
 *  
 * 
 * $Id: mesh.c 38879 2011-07-31 11:12:38Z dfelinto $
 *
 * ***** 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.
 *
 * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
 * All rights reserved.
 *
 * Contributor(s): Blender Foundation
 *
 * ***** END GPL LICENSE BLOCK *****
 */

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

#include "MEM_guardedalloc.h"

#include "DNA_scene_types.h"
#include "DNA_material_types.h"
#include "DNA_object_types.h"
#include "DNA_key_types.h"
#include "DNA_meshdata_types.h"
#include "DNA_ipo_types.h"

#include "BLI_blenlib.h"
#include "BLI_editVert.h"
#include "BLI_math.h"
#include "BLI_edgehash.h"
#include "BLI_utildefines.h"

#include "BKE_animsys.h"
#include "BKE_main.h"
#include "BKE_DerivedMesh.h"
#include "BKE_global.h"
#include "BKE_mesh.h"
#include "BKE_displist.h"
#include "BKE_library.h"
#include "BKE_material.h"
#include "BKE_modifier.h"
#include "BKE_multires.h"
#include "BKE_key.h"
/* these 2 are only used by conversion functions */
#include "BKE_curve.h"
/* -- */
#include "BKE_object.h"


EditMesh *BKE_mesh_get_editmesh(Mesh *me)
{
        return me->edit_mesh;
}

void BKE_mesh_end_editmesh(Mesh *UNUSED(me), EditMesh *UNUSED(em))
{
}


void mesh_update_customdata_pointers(Mesh *me)
{
        me->mvert = CustomData_get_layer(&me->vdata, CD_MVERT);
        me->dvert = CustomData_get_layer(&me->vdata, CD_MDEFORMVERT);
        me->msticky = CustomData_get_layer(&me->vdata, CD_MSTICKY);

        me->medge = CustomData_get_layer(&me->edata, CD_MEDGE);

        me->mface = CustomData_get_layer(&me->fdata, CD_MFACE);
        me->mcol = CustomData_get_layer(&me->fdata, CD_MCOL);
        me->mtface = CustomData_get_layer(&me->fdata, CD_MTFACE);
}

/* Note: unlinking is called when me->id.us is 0, question remains how
 * much unlinking of Library data in Mesh should be done... probably
 * we need a more generic method, like the expand() functions in
 * readfile.c */

void unlink_mesh(Mesh *me)
{
        int a;
        
        if(me==NULL) return;
        
        for(a=0; a<me->totcol; a++) {
                if(me->mat[a]) me->mat[a]->id.us--;
                me->mat[a]= NULL;
        }

        if(me->key) {
                   me->key->id.us--;
                if (me->key->id.us == 0 && me->key->ipo )
                        me->key->ipo->id.us--;
        }
        me->key= NULL;
        
        if(me->texcomesh) me->texcomesh= NULL;
}


/* do not free mesh itself */
void free_mesh(Mesh *me)
{
        unlink_mesh(me);

        if(me->pv) {
                if(me->pv->vert_map) MEM_freeN(me->pv->vert_map);
                if(me->pv->edge_map) MEM_freeN(me->pv->edge_map);
                if(me->pv->old_faces) MEM_freeN(me->pv->old_faces);
                if(me->pv->old_edges) MEM_freeN(me->pv->old_edges);
                me->totvert= me->pv->totvert;
                me->totedge= me->pv->totedge;
                me->totface= me->pv->totface;
                MEM_freeN(me->pv);
        }

        CustomData_free(&me->vdata, me->totvert);
        CustomData_free(&me->edata, me->totedge);
        CustomData_free(&me->fdata, me->totface);
        
        if(me->adt) {
                BKE_free_animdata(&me->id);
                me->adt= NULL;
        }
        
        if(me->mat) MEM_freeN(me->mat);
        
        if(me->bb) MEM_freeN(me->bb);
        if(me->mselect) MEM_freeN(me->mselect);
        if(me->edit_mesh) MEM_freeN(me->edit_mesh);
}

void copy_dverts(MDeformVert *dst, MDeformVert *src, int copycount)
{
        /* Assumes dst is already set up */
        int i;

        if (!src || !dst)
                return;

        memcpy (dst, src, copycount * sizeof(MDeformVert));
        
        for (i=0; i<copycount; i++){
                if (src[i].dw){
                        dst[i].dw = MEM_callocN (sizeof(MDeformWeight)*src[i].totweight, "copy_deformWeight");
                        memcpy (dst[i].dw, src[i].dw, sizeof (MDeformWeight)*src[i].totweight);
                }
        }

}

void free_dverts(MDeformVert *dvert, int totvert)
{
        /* Instead of freeing the verts directly,
        call this function to delete any special
        vert data */
        int     i;

        if (!dvert)
                return;

        /* Free any special data from the verts */
        for (i=0; i<totvert; i++){
                if (dvert[i].dw) MEM_freeN (dvert[i].dw);
        }
        MEM_freeN (dvert);
}

Mesh *add_mesh(const char *name)
{
        Mesh *me;
        
        me= alloc_libblock(&G.main->mesh, ID_ME, name);
        
        me->size[0]= me->size[1]= me->size[2]= 1.0;
        me->smoothresh= 30;
        me->texflag= AUTOSPACE;
        me->flag= ME_TWOSIDED;
        me->bb= unit_boundbox();
        me->drawflag= ME_DRAWEDGES|ME_DRAWFACES|ME_DRAWCREASES;
        
        return me;
}

Mesh *copy_mesh(Mesh *me)
{
        Mesh *men;
        MTFace *tface;
        int a, i;
        
        men= copy_libblock(me);
        
        men->mat= MEM_dupallocN(me->mat);
        for(a=0; a<men->totcol; a++) {
                id_us_plus((ID *)men->mat[a]);
        }
        id_us_plus((ID *)men->texcomesh);

        CustomData_copy(&me->vdata, &men->vdata, CD_MASK_MESH, CD_DUPLICATE, men->totvert);
        CustomData_copy(&me->edata, &men->edata, CD_MASK_MESH, CD_DUPLICATE, men->totedge);
        CustomData_copy(&me->fdata, &men->fdata, CD_MASK_MESH, CD_DUPLICATE, men->totface);
        mesh_update_customdata_pointers(men);

        /* ensure indirect linked data becomes lib-extern */
        for(i=0; i<me->fdata.totlayer; i++) {
                if(me->fdata.layers[i].type == CD_MTFACE) {
                        tface= (MTFace*)me->fdata.layers[i].data;

                        for(a=0; a<me->totface; a++, tface++)
                                if(tface->tpage)
                                        id_lib_extern((ID*)tface->tpage);
                }
        }
        
        men->mselect= NULL;
        men->edit_mesh= NULL;
        men->pv= NULL; /* looks like this is no-longer supported but NULL just incase */

        men->bb= MEM_dupallocN(men->bb);
        
        men->key= copy_key(me->key);
        if(men->key) men->key->from= (ID *)men;

        return men;
}

static void make_local_tface(Main *bmain, Mesh *me)
{
        MTFace *tface;
        Image *ima;
        int a, i;
        
        for(i=0; i<me->fdata.totlayer; i++) {
                if(me->fdata.layers[i].type == CD_MTFACE) {
                        tface= (MTFace*)me->fdata.layers[i].data;
                        
                        for(a=0; a<me->totface; a++, tface++) {
                                /* special case: ima always local immediately */
                                if(tface->tpage) {
                                        ima= tface->tpage;
                                        if(ima->id.lib) {
                                                ima->id.lib= NULL;
                                                ima->id.flag= LIB_LOCAL;
                                                new_id(&bmain->image, (ID *)ima, NULL);
                                        }
                                }
                        }
                }
        }
}

static void expand_local_mesh(Main *bmain, Mesh *me)
{
        id_lib_extern((ID *)me->texcomesh);

        if(me->mtface) {
                /* why is this an exception? - should not really make local when extern'ing - campbell */
                make_local_tface(bmain, me);
        }

        if(me->mat) {
                extern_local_matarar(me->mat, me->totcol);
        }
}

void make_local_mesh(Mesh *me)
{
        Main *bmain= G.main;
        Object *ob;
        int local=0, lib=0;

        /* - only lib users: do nothing
         * - only local users: set flag
         * - mixed: make copy
         */

        if(me->id.lib==NULL) return;
        if(me->id.us==1) {
                me->id.lib= NULL;
                me->id.flag= LIB_LOCAL;

                new_id(&bmain->mesh, (ID *)me, NULL);
                expand_local_mesh(bmain, me);
                return;
        }

        for(ob= bmain->object.first; ob && ELEM(0, lib, local); ob= ob->id.next) {
                if(me == ob->data) {
                        if(ob->id.lib) lib= 1;
                        else local= 1;
                }
        }

        if(local && lib==0) {
                me->id.lib= NULL;
                me->id.flag= LIB_LOCAL;

                new_id(&bmain->mesh, (ID *)me, NULL);
                expand_local_mesh(bmain, me);
        }
        else if(local && lib) {
                Mesh *men= copy_mesh(me);
                men->id.us= 0;

                for(ob= bmain->object.first; ob; ob= ob->id.next) {
                        if(me == ob->data) {
                                if(ob->id.lib==NULL) {
                                        set_mesh(ob, men);
                                }
                        }
                }
        }
}

void boundbox_mesh(Mesh *me, float *loc, float *size)
{
        BoundBox *bb;
        float min[3], max[3];
        float mloc[3], msize[3];
        
        if(me->bb==NULL) me->bb= MEM_callocN(sizeof(BoundBox), "boundbox");
        bb= me->bb;

        if (!loc) loc= mloc;
        if (!size) size= msize;
        
        INIT_MINMAX(min, max);
        if(!minmax_mesh(me, min, max)) {
                min[0] = min[1] = min[2] = -1.0f;
                max[0] = max[1] = max[2] = 1.0f;
        }

        mid_v3_v3v3(loc, min, max);
                
        size[0]= (max[0]-min[0])/2.0f;
        size[1]= (max[1]-min[1])/2.0f;
        size[2]= (max[2]-min[2])/2.0f;
        
        boundbox_set_from_min_max(bb, min, max);
}

void tex_space_mesh(Mesh *me)
{
        float loc[3], size[3];
        int a;

        boundbox_mesh(me, loc, size);

        if(me->texflag & AUTOSPACE) {
                for (a=0; a<3; a++) {
                        if(size[a]==0.0f) size[a]= 1.0f;
                        else if(size[a]>0.0f && size[a]<0.00001f) size[a]= 0.00001f;
                        else if(size[a]<0.0f && size[a]> -0.00001f) size[a]= -0.00001f;
                }

                copy_v3_v3(me->loc, loc);
                copy_v3_v3(me->size, size);
                zero_v3(me->rot);
        }
}

BoundBox *mesh_get_bb(Object *ob)
{
        Mesh *me= ob->data;

        if(ob->bb)
                return ob->bb;

        if (!me->bb)
                tex_space_mesh(me);

        return me->bb;
}

void mesh_get_texspace(Mesh *me, float *loc_r, float *rot_r, float *size_r)
{
        if (!me->bb) {
                tex_space_mesh(me);
        }

        if (loc_r) VECCOPY(loc_r, me->loc);
        if (rot_r) VECCOPY(rot_r, me->rot);
        if (size_r) VECCOPY(size_r, me->size);
}

float *get_mesh_orco_verts(Object *ob)
{
        Mesh *me = ob->data;
        MVert *mvert = NULL;
        Mesh *tme = me->texcomesh?me->texcomesh:me;
        int a, totvert;
        float (*vcos)[3] = NULL;

        /* Get appropriate vertex coordinates */
        vcos = MEM_callocN(sizeof(*vcos)*me->totvert, "orco mesh");
        mvert = tme->mvert;
        totvert = MIN2(tme->totvert, me->totvert);

        for(a=0; a<totvert; a++, mvert++) {
                copy_v3_v3(vcos[a], mvert->co);
        }

        return (float*)vcos;
}

void transform_mesh_orco_verts(Mesh *me, float (*orco)[3], int totvert, int invert)
{
        float loc[3], size[3];
        int a;

        mesh_get_texspace(me->texcomesh?me->texcomesh:me, loc, NULL, size);

        if(invert) {
                for(a=0; a<totvert; a++) {
                        float *co = orco[a];
                        madd_v3_v3v3v3(co, loc, co, size);
                }
        }
        else {
                for(a=0; a<totvert; a++) {
                        float *co = orco[a];
                        co[0] = (co[0]-loc[0])/size[0];
                        co[1] = (co[1]-loc[1])/size[1];
                        co[2] = (co[2]-loc[2])/size[2];
                }
        }
}

/* rotates the vertices of a face in case v[2] or v[3] (vertex index) is = 0.
   this is necessary to make the if(mface->v4) check for quads work */
int test_index_face(MFace *mface, CustomData *fdata, int mfindex, int nr)
{
        /* first test if the face is legal */
        if((mface->v3 || nr==4) && mface->v3==mface->v4) {
                mface->v4= 0;
                nr--;
        }
        if((mface->v2 || mface->v4) && mface->v2==mface->v3) {
                mface->v3= mface->v4;
                mface->v4= 0;
                nr--;
        }
        if(mface->v1==mface->v2) {
                mface->v2= mface->v3;
                mface->v3= mface->v4;
                mface->v4= 0;
                nr--;
        }

        /* check corrupt cases, bowtie geometry, cant handle these because edge data wont exist so just return 0 */
        if(nr==3) {
                if(
                /* real edges */
                        mface->v1==mface->v2 ||
                        mface->v2==mface->v3 ||
                        mface->v3==mface->v1
                ) {
                        return 0;
                }
        }
        else if(nr==4) {
                if(
                /* real edges */
                        mface->v1==mface->v2 ||
                        mface->v2==mface->v3 ||
                        mface->v3==mface->v4 ||
                        mface->v4==mface->v1 ||
                /* across the face */
                        mface->v1==mface->v3 ||
                        mface->v2==mface->v4
                ) {
                        return 0;
                }
        }

        /* prevent a zero at wrong index location */
        if(nr==3) {
                if(mface->v3==0) {
                        static int corner_indices[4] = {1, 2, 0, 3};

                        SWAP(int, mface->v1, mface->v2);
                        SWAP(int, mface->v2, mface->v3);

                        if(fdata)
                                CustomData_swap(fdata, mfindex, corner_indices);
                }
        }
        else if(nr==4) {
                if(mface->v3==0 || mface->v4==0) {
                        static int corner_indices[4] = {2, 3, 0, 1};

                        SWAP(int, mface->v1, mface->v3);
                        SWAP(int, mface->v2, mface->v4);

                        if(fdata)
                                CustomData_swap(fdata, mfindex, corner_indices);
                }
        }

        return nr;
}

Mesh *get_mesh(Object *ob)
{
        
        if(ob==NULL) return NULL;
        if(ob->type==OB_MESH) return ob->data;
        else return NULL;
}

void set_mesh(Object *ob, Mesh *me)
{
        Mesh *old=NULL;

        multires_force_update(ob);
        
        if(ob==NULL) return;
        
        if(ob->type==OB_MESH) {
                old= ob->data;
                if (old)
                        old->id.us--;
                ob->data= me;
                id_us_plus((ID *)me);
        }
        
        test_object_materials((ID *)me);

        test_object_modifiers(ob);
}

/* ************** make edges in a Mesh, for outside of editmode */

struct edgesort {
        int v1, v2;
        short is_loose, is_draw;
};

/* edges have to be added with lowest index first for sorting */
static void to_edgesort(struct edgesort *ed, int v1, int v2, short is_loose, short is_draw)
{
        if(v1<v2) {
                ed->v1= v1; ed->v2= v2;
        }
        else {
                ed->v1= v2; ed->v2= v1;
        }
        ed->is_loose= is_loose;
        ed->is_draw= is_draw;
}

static int vergedgesort(const void *v1, const void *v2)
{
        const struct edgesort *x1=v1, *x2=v2;

        if( x1->v1 > x2->v1) return 1;
        else if( x1->v1 < x2->v1) return -1;
        else if( x1->v2 > x2->v2) return 1;
        else if( x1->v2 < x2->v2) return -1;
        
        return 0;
}

static void mfaces_strip_loose(MFace *mface, int *totface)
{
        int a,b;

        for (a=b=0; a<*totface; a++) {
                if (mface[a].v3) {
                        if (a!=b) {
                                memcpy(&mface[b],&mface[a],sizeof(mface[b]));
                        }
                        b++;
                }
        }

        *totface= b;
}

/* Create edges based on known verts and faces */
static void make_edges_mdata(MVert *UNUSED(allvert), MFace *allface, int UNUSED(totvert), int totface,
        int old, MEdge **alledge, int *_totedge)
{
        MFace *mface;
        MEdge *medge;
        struct edgesort *edsort, *ed;
        int a, totedge=0, final=0;

        /* we put all edges in array, sort them, and detect doubles that way */

        for(a= totface, mface= allface; a>0; a--, mface++) {
                if(mface->v4) totedge+=4;
                else if(mface->v3) totedge+=3;
                else totedge+=1;
        }

        if(totedge==0) {
                /* flag that mesh has edges */
                (*alledge)= MEM_callocN(0, "make mesh edges");
                (*_totedge) = 0;
                return;
        }

        ed= edsort= MEM_mallocN(totedge*sizeof(struct edgesort), "edgesort");

        for(a= totface, mface= allface; a>0; a--, mface++) {
                to_edgesort(ed++, mface->v1, mface->v2, !mface->v3, mface->edcode & ME_V1V2);
                if(mface->v4) {
                        to_edgesort(ed++, mface->v2, mface->v3, 0, mface->edcode & ME_V2V3);
                        to_edgesort(ed++, mface->v3, mface->v4, 0, mface->edcode & ME_V3V4);
                        to_edgesort(ed++, mface->v4, mface->v1, 0, mface->edcode & ME_V4V1);
                }
                else if(mface->v3) {
                        to_edgesort(ed++, mface->v2, mface->v3, 0, mface->edcode & ME_V2V3);
                        to_edgesort(ed++, mface->v3, mface->v1, 0, mface->edcode & ME_V3V1);
                }
        }

        qsort(edsort, totedge, sizeof(struct edgesort), vergedgesort);

        /* count final amount */
        for(a=totedge, ed=edsort; a>1; a--, ed++) {
                /* edge is unique when it differs from next edge, or is last */
                if(ed->v1 != (ed+1)->v1 || ed->v2 != (ed+1)->v2) final++;
        }
        final++;

        (*alledge)= medge= MEM_callocN(sizeof (MEdge) * final, "make_edges mdge");
        (*_totedge)= final;

        for(a=totedge, ed=edsort; a>1; a--, ed++) {
                /* edge is unique when it differs from next edge, or is last */
                if(ed->v1 != (ed+1)->v1 || ed->v2 != (ed+1)->v2) {
                        medge->v1= ed->v1;
                        medge->v2= ed->v2;
                        if(old==0 || ed->is_draw) medge->flag= ME_EDGEDRAW|ME_EDGERENDER;
                        if(ed->is_loose) medge->flag|= ME_LOOSEEDGE;

                        /* order is swapped so extruding this edge as a surface wont flip face normals
                         * with cyclic curves */
                        if(ed->v1+1 != ed->v2) {
                                SWAP(int, medge->v1, medge->v2);
                        }
                        medge++;
                }
                else {
                        /* equal edge, we merge the drawflag */
                        (ed+1)->is_draw |= ed->is_draw;
                }
        }
        /* last edge */
        medge->v1= ed->v1;
        medge->v2= ed->v2;
        medge->flag= ME_EDGEDRAW;
        if(ed->is_loose) medge->flag|= ME_LOOSEEDGE;
        medge->flag |= ME_EDGERENDER;

        MEM_freeN(edsort);
}

void make_edges(Mesh *me, int old)
{
        MEdge *medge;
        int totedge=0;

        make_edges_mdata(me->mvert, me->mface, me->totvert, me->totface, old, &medge, &totedge);
        if(totedge==0) {
                /* flag that mesh has edges */
                me->medge = medge;
                me->totedge = 0;
                return;
        }

        medge= CustomData_add_layer(&me->edata, CD_MEDGE, CD_ASSIGN, medge, totedge);
        me->medge= medge;
        me->totedge= totedge;

        mesh_strip_loose_faces(me);
}

void mesh_strip_loose_faces(Mesh *me)
{
        int a,b;

        for (a=b=0; a<me->totface; a++) {
                if (me->mface[a].v3) {
                        if (a!=b) {
                                memcpy(&me->mface[b],&me->mface[a],sizeof(me->mface[b]));
                                CustomData_copy_data(&me->fdata, &me->fdata, a, b, 1);
                                CustomData_free_elem(&me->fdata, a, 1);
                        }
                        b++;
                }
        }
        me->totface = b;
}

void mesh_strip_loose_edges(Mesh *me)
{
        int a,b;

        for (a=b=0; a<me->totedge; a++) {
                if (me->medge[a].v1!=me->medge[a].v2) {
                        if (a!=b) {
                                memcpy(&me->medge[b],&me->medge[a],sizeof(me->medge[b]));
                                CustomData_copy_data(&me->edata, &me->edata, a, b, 1);
                                CustomData_free_elem(&me->edata, a, 1);
                        }
                        b++;
                }
        }
        me->totedge = b;
}

void mball_to_mesh(ListBase *lb, Mesh *me)
{
        DispList *dl;
        MVert *mvert;
        MFace *mface;
        float *nors, *verts;
        int a, *index;
        
        dl= lb->first;
        if(dl==NULL) return;

        if(dl->type==DL_INDEX4) {
                me->totvert= dl->nr;
                me->totface= dl->parts;
                
                mvert= CustomData_add_layer(&me->vdata, CD_MVERT, CD_CALLOC, NULL, dl->nr);
                mface= CustomData_add_layer(&me->fdata, CD_MFACE, CD_CALLOC, NULL, dl->parts);
                me->mvert= mvert;
                me->mface= mface;

                a= dl->nr;
                nors= dl->nors;
                verts= dl->verts;
                while(a--) {
                        VECCOPY(mvert->co, verts);
                        normal_float_to_short_v3(mvert->no, nors);
                        mvert++;
                        nors+= 3;
                        verts+= 3;
                }
                
                a= dl->parts;
                index= dl->index;
                while(a--) {
                        mface->v1= index[0];
                        mface->v2= index[1];
                        mface->v3= index[2];
                        mface->v4= index[3];
                        mface->flag= ME_SMOOTH;

                        test_index_face(mface, NULL, 0, (mface->v3==mface->v4)? 3: 4);

                        mface++;
                        index+= 4;
                }

                make_edges(me, 0);      // all edges
        }       
}

/* Initialize mverts, medges and, faces for converting nurbs to mesh and derived mesh */
/* return non-zero on error */
int nurbs_to_mdata(Object *ob, MVert **allvert, int *totvert,
        MEdge **alledge, int *totedge, MFace **allface, int *totface)
{
        return nurbs_to_mdata_customdb(ob, &ob->disp,
                allvert, totvert, alledge, totedge, allface, totface);
}

/* Initialize mverts, medges and, faces for converting nurbs to mesh and derived mesh */
/* use specified dispbase  */
int nurbs_to_mdata_customdb(Object *ob, ListBase *dispbase, MVert **allvert, int *_totvert,
        MEdge **alledge, int *_totedge, MFace **allface, int *_totface)
{
        DispList *dl;
        Curve *cu;
        MVert *mvert;
        MFace *mface;
        float *data;
        int a, b, ofs, vertcount, startvert, totvert=0, totvlak=0;
        int p1, p2, p3, p4, *index;
        int conv_polys= 0;

        cu= ob->data;

        conv_polys|= cu->flag & CU_3D;          /* 2d polys are filled with DL_INDEX3 displists */
        conv_polys|= ob->type == OB_SURF;       /* surf polys are never filled */

        /* count */
        dl= dispbase->first;
        while(dl) {
                if(dl->type==DL_SEGM) {
                        totvert+= dl->parts*dl->nr;
                        totvlak+= dl->parts*(dl->nr-1);
                }
                else if(dl->type==DL_POLY) {
                        if(conv_polys) {
                                totvert+= dl->parts*dl->nr;
                                totvlak+= dl->parts*dl->nr;
                        }
                }
                else if(dl->type==DL_SURF) {
                        totvert+= dl->parts*dl->nr;
                        totvlak+= (dl->parts-1+((dl->flag & DL_CYCL_V)==2))*(dl->nr-1+(dl->flag & DL_CYCL_U));
                }
                else if(dl->type==DL_INDEX3) {
                        totvert+= dl->nr;
                        totvlak+= dl->parts;
                }
                dl= dl->next;
        }

        if(totvert==0) {
                /* error("can't convert"); */
                /* Make Sure you check ob->data is a curve */
                return -1;
        }

        *allvert= mvert= MEM_callocN(sizeof (MVert) * totvert, "nurbs_init mvert");
        *allface= mface= MEM_callocN(sizeof (MFace) * totvlak, "nurbs_init mface");

        /* verts and faces */
        vertcount= 0;

        dl= dispbase->first;
        while(dl) {
                int smooth= dl->rt & CU_SMOOTH ? 1 : 0;

                if(dl->type==DL_SEGM) {
                        startvert= vertcount;
                        a= dl->parts*dl->nr;
                        data= dl->verts;
                        while(a--) {
                                VECCOPY(mvert->co, data);
                                data+=3;
                                vertcount++;
                                mvert++;
                        }

                        for(a=0; a<dl->parts; a++) {
                                ofs= a*dl->nr;
                                for(b=1; b<dl->nr; b++) {
                                        mface->v1= startvert+ofs+b-1;
                                        mface->v2= startvert+ofs+b;
                                        if(smooth) mface->flag |= ME_SMOOTH;
                                        mface++;
                                }
                        }

                }
                else if(dl->type==DL_POLY) {
                        if(conv_polys) {
                                startvert= vertcount;
                                a= dl->parts*dl->nr;
                                data= dl->verts;
                                while(a--) {
                                        VECCOPY(mvert->co, data);
                                        data+=3;
                                        vertcount++;
                                        mvert++;
                                }

                                for(a=0; a<dl->parts; a++) {
                                        ofs= a*dl->nr;
                                        for(b=0; b<dl->nr; b++) {
                                                mface->v1= startvert+ofs+b;
                                                if(b==dl->nr-1) mface->v2= startvert+ofs;
                                                else mface->v2= startvert+ofs+b+1;
                                                if(smooth) mface->flag |= ME_SMOOTH;
                                                mface++;
                                        }
                                }
                        }
                }
                else if(dl->type==DL_INDEX3) {
                        startvert= vertcount;
                        a= dl->nr;
                        data= dl->verts;
                        while(a--) {
                                VECCOPY(mvert->co, data);
                                data+=3;
                                vertcount++;
                                mvert++;
                        }

                        a= dl->parts;
                        index= dl->index;
                        while(a--) {
                                mface->v1= startvert+index[0];
                                mface->v2= startvert+index[2];
                                mface->v3= startvert+index[1];
                                mface->v4= 0;
                                mface->mat_nr= (unsigned char)dl->col;
                                test_index_face(mface, NULL, 0, 3);

                                if(smooth) mface->flag |= ME_SMOOTH;
                                mface++;
                                index+= 3;
                        }


                }
                else if(dl->type==DL_SURF) {
                        startvert= vertcount;
                        a= dl->parts*dl->nr;
                        data= dl->verts;
                        while(a--) {
                                VECCOPY(mvert->co, data);
                                data+=3;
                                vertcount++;
                                mvert++;
                        }

                        for(a=0; a<dl->parts; a++) {

                                if( (dl->flag & DL_CYCL_V)==0 && a==dl->parts-1) break;

                                if(dl->flag & DL_CYCL_U) {                      /* p2 -> p1 -> */
                                        p1= startvert+ dl->nr*a;        /* p4 -> p3 -> */
                                        p2= p1+ dl->nr-1;               /* -----> next row */
                                        p3= p1+ dl->nr;
                                        p4= p2+ dl->nr;
                                        b= 0;
                                }
                                else {
                                        p2= startvert+ dl->nr*a;
                                        p1= p2+1;
                                        p4= p2+ dl->nr;
                                        p3= p1+ dl->nr;
                                        b= 1;
                                }
                                if( (dl->flag & DL_CYCL_V) && a==dl->parts-1) {
                                        p3-= dl->parts*dl->nr;
                                        p4-= dl->parts*dl->nr;
                                }

                                for(; b<dl->nr; b++) {
                                        mface->v1= p1;
                                        mface->v2= p3;
                                        mface->v3= p4;
                                        mface->v4= p2;
                                        mface->mat_nr= (unsigned char)dl->col;
                                        test_index_face(mface, NULL, 0, 4);

                                        if(smooth) mface->flag |= ME_SMOOTH;
                                        mface++;

                                        p4= p3;
                                        p3++;
                                        p2= p1;
                                        p1++;
                                }
                        }

                }

                dl= dl->next;
        }

        *_totvert= totvert;
        *_totface= totvlak;

        make_edges_mdata(*allvert, *allface, totvert, totvlak, 0, alledge, _totedge);
        mfaces_strip_loose(*allface, _totface);

        return 0;
}

/* this may fail replacing ob->data, be sure to check ob->type */
void nurbs_to_mesh(Object *ob)
{
        Main *bmain= G.main;
        Object *ob1;
        DerivedMesh *dm= ob->derivedFinal;
        Mesh *me;
        Curve *cu;
        MVert *allvert= NULL;
        MEdge *alledge= NULL;
        MFace *allface= NULL;
        int totvert, totedge, totface;

        cu= ob->data;

        if (dm == NULL) {
                if (nurbs_to_mdata (ob, &allvert, &totvert, &alledge, &totedge, &allface, &totface) != 0) {
                        /* Error initializing */
                        return;
                }

                /* make mesh */
                me= add_mesh("Mesh");
                me->totvert= totvert;
                me->totface= totface;
                me->totedge= totedge;

                me->mvert= CustomData_add_layer(&me->vdata, CD_MVERT, CD_ASSIGN, allvert, me->totvert);
                me->mface= CustomData_add_layer(&me->fdata, CD_MFACE, CD_ASSIGN, allface, me->totface);
                me->medge= CustomData_add_layer(&me->edata, CD_MEDGE, CD_ASSIGN, alledge, me->totedge);

                mesh_calc_normals(me->mvert, me->totvert, me->mface, me->totface, NULL);
        } else {
                me= add_mesh("Mesh");
                DM_to_mesh(dm, me);
        }

        me->totcol= cu->totcol;
        me->mat= cu->mat;

        tex_space_mesh(me);

        cu->mat= NULL;
        cu->totcol= 0;

        if(ob->data) {
                free_libblock(&bmain->curve, ob->data);
        }
        ob->data= me;
        ob->type= OB_MESH;

        /* other users */
        ob1= bmain->object.first;
        while(ob1) {
                if(ob1->data==cu) {
                        ob1->type= OB_MESH;
                
                        ob1->data= ob->data;
                        id_us_plus((ID *)ob->data);
                }
                ob1= ob1->id.next;
        }
}

typedef struct EdgeLink {
        Link *next, *prev;
        void *edge;
} EdgeLink;

typedef struct VertLink {
        Link *next, *prev;
        int index;
} VertLink;

static void prependPolyLineVert(ListBase *lb, int index)
{
        VertLink *vl= MEM_callocN(sizeof(VertLink), "VertLink");
        vl->index = index;
        BLI_addhead(lb, vl);
}

static void appendPolyLineVert(ListBase *lb, int index)
{
        VertLink *vl= MEM_callocN(sizeof(VertLink), "VertLink");
        vl->index = index;
        BLI_addtail(lb, vl);
}

void mesh_to_curve(Scene *scene, Object *ob)
{
        /* make new mesh data from the original copy */
        DerivedMesh *dm= mesh_get_derived_final(scene, ob, CD_MASK_MESH);

        MVert *mverts= dm->getVertArray(dm);
        MEdge *med, *medge= dm->getEdgeArray(dm);
        MFace *mf,  *mface= dm->getFaceArray(dm);

        int totedge = dm->getNumEdges(dm);
        int totface = dm->getNumFaces(dm);
        int totedges = 0;
        int i, needsFree = 0;

        /* only to detect edge polylines */
        EdgeHash *eh = BLI_edgehash_new();
        EdgeHash *eh_edge = BLI_edgehash_new();


        ListBase edges = {NULL, NULL};

        /* create edges from all faces (so as to find edges not in any faces) */
        mf= mface;
        for (i = 0; i < totface; i++, mf++) {
                if (!BLI_edgehash_haskey(eh, mf->v1, mf->v2))
                        BLI_edgehash_insert(eh, mf->v1, mf->v2, NULL);
                if (!BLI_edgehash_haskey(eh, mf->v2, mf->v3))
                        BLI_edgehash_insert(eh, mf->v2, mf->v3, NULL);

                if (mf->v4) {
                        if (!BLI_edgehash_haskey(eh, mf->v3, mf->v4))
                                BLI_edgehash_insert(eh, mf->v3, mf->v4, NULL);
                        if (!BLI_edgehash_haskey(eh, mf->v4, mf->v1))
                                BLI_edgehash_insert(eh, mf->v4, mf->v1, NULL);
                } else {
                        if (!BLI_edgehash_haskey(eh, mf->v3, mf->v1))
                                BLI_edgehash_insert(eh, mf->v3, mf->v1, NULL);
                }
        }

        med= medge;
        for(i=0; i<totedge; i++, med++) {
                if (!BLI_edgehash_haskey(eh, med->v1, med->v2)) {
                        EdgeLink *edl= MEM_callocN(sizeof(EdgeLink), "EdgeLink");

                        BLI_edgehash_insert(eh_edge, med->v1, med->v2, NULL);
                        edl->edge= med;

                        BLI_addtail(&edges, edl);       totedges++;
                }
        }
        BLI_edgehash_free(eh_edge, NULL);
        BLI_edgehash_free(eh, NULL);

        if(edges.first) {
                Curve *cu = add_curve(ob->id.name+2, OB_CURVE);
                cu->flag |= CU_3D;

                while(edges.first) {
                        /* each iteration find a polyline and add this as a nurbs poly spline */

                        ListBase polyline = {NULL, NULL}; /* store a list of VertLink's */
                        int closed = FALSE;
                        int totpoly= 0;
                        MEdge *med_current= ((EdgeLink *)edges.last)->edge;
                        int startVert= med_current->v1;
                        int endVert= med_current->v2;
                        int ok= TRUE;

                        appendPolyLineVert(&polyline, startVert);       totpoly++;
                        appendPolyLineVert(&polyline, endVert);         totpoly++;
                        BLI_freelinkN(&edges, edges.last);                      totedges--;

                        while(ok) { /* while connected edges are found... */
                                ok = FALSE;
                                i= totedges;
                                while(i) {
                                        EdgeLink *edl;

                                        i-=1;
                                        edl= BLI_findlink(&edges, i);
                                        med= edl->edge;

                                        if(med->v1==endVert) {
                                                endVert = med->v2;
                                                appendPolyLineVert(&polyline, med->v2); totpoly++;
                                                BLI_freelinkN(&edges, edl);                             totedges--;
                                                ok= TRUE;
                                        }
                                        else if(med->v2==endVert) {
                                                endVert = med->v1;
                                                appendPolyLineVert(&polyline, endVert); totpoly++;
                                                BLI_freelinkN(&edges, edl);                             totedges--;
                                                ok= TRUE;
                                        }
                                        else if(med->v1==startVert) {
                                                startVert = med->v2;
                                                prependPolyLineVert(&polyline, startVert);      totpoly++;
                                                BLI_freelinkN(&edges, edl);                                     totedges--;
                                                ok= TRUE;
                                        }
                                        else if(med->v2==startVert) {
                                                startVert = med->v1;
                                                prependPolyLineVert(&polyline, startVert);      totpoly++;
                                                BLI_freelinkN(&edges, edl);                                     totedges--;
                                                ok= TRUE;
                                        }
                                }
                        }

                        /* Now we have a polyline, make into a curve */
                        if(startVert==endVert) {
                                BLI_freelinkN(&polyline, polyline.last);
                                totpoly--;
                                closed = TRUE;
                        }

                        /* --- nurbs --- */
                        {
                                Nurb *nu;
                                BPoint *bp;
                                VertLink *vl;

                                /* create new 'nurb' within the curve */
                                nu = (Nurb *)MEM_callocN(sizeof(Nurb), "MeshNurb");

                                nu->pntsu= totpoly;
                                nu->pntsv= 1;
                                nu->orderu= 4;
                                nu->flagu= CU_NURB_ENDPOINT | (closed ? CU_NURB_CYCLIC:0);      /* endpoint */
                                nu->resolu= 12;

                                nu->bp= (BPoint *)MEM_callocN(sizeof(BPoint)*totpoly, "bpoints");

                                /* add points */
                                vl= polyline.first;
                                for (i=0, bp=nu->bp; i < totpoly; i++, bp++, vl=(VertLink *)vl->next) {
                                        copy_v3_v3(bp->vec, mverts[vl->index].co);
                                        bp->f1= SELECT;
                                        bp->radius = bp->weight = 1.0;
                                }
                                BLI_freelistN(&polyline);

                                /* add nurb to curve */
                                BLI_addtail(&cu->nurb, nu);
                        }
                        /* --- done with nurbs --- */
                }

                ((Mesh *)ob->data)->id.us--;
                ob->data= cu;
                ob->type= OB_CURVE;

                /* curve objects can't contain DM in usual cases, we could free memory */
                needsFree= 1;
        }

        dm->needsFree = needsFree;
        dm->release(dm);

        if (needsFree) {
                ob->derivedFinal = NULL;

                /* curve object could have got bounding box only in special cases */
                if(ob->bb) {
                        MEM_freeN(ob->bb);
                        ob->bb= NULL;
                }
        }
}

void mesh_delete_material_index(Mesh *me, int index)
{
        MFace *mf;
        int i;

        for (i=0, mf=me->mface; i<me->totface; i++, mf++) {
                if (mf->mat_nr && mf->mat_nr>=index) 
                        mf->mat_nr--;
        }
}

void mesh_set_smooth_flag(Object *meshOb, int enableSmooth) 
{
        Mesh *me = meshOb->data;
        int i;

        for (i=0; i<me->totface; i++) {
                MFace *mf = &((MFace*) me->mface)[i];

                if (enableSmooth) {
                        mf->flag |= ME_SMOOTH;
                } else {
                        mf->flag &= ~ME_SMOOTH;
                }
        }

        mesh_calc_normals(me->mvert, me->totvert, me->mface, me->totface, NULL);
}

void mesh_calc_normals(MVert *mverts, int numVerts, MFace *mfaces, int numFaces, float (*faceNors_r)[3]) 
{
        float (*tnorms)[3]= MEM_callocN(numVerts*sizeof(*tnorms), "tnorms");
        float (*fnors)[3]= (faceNors_r)? faceNors_r: MEM_callocN(sizeof(*fnors)*numFaces, "meshnormals");
        int i;

        for(i=0; i<numFaces; i++) {
                MFace *mf= &mfaces[i];
                float *f_no= fnors[i];
                float *n4 = (mf->v4)? tnorms[mf->v4]: NULL;
                float *c4 = (mf->v4)? mverts[mf->v4].co: NULL;

                if(mf->v4)
                        normal_quad_v3(f_no, mverts[mf->v1].co, mverts[mf->v2].co, mverts[mf->v3].co, mverts[mf->v4].co);
                else
                        normal_tri_v3(f_no, mverts[mf->v1].co, mverts[mf->v2].co, mverts[mf->v3].co);

                accumulate_vertex_normals(tnorms[mf->v1], tnorms[mf->v2], tnorms[mf->v3], n4,
                        f_no, mverts[mf->v1].co, mverts[mf->v2].co, mverts[mf->v3].co, c4);
        }

        /* following Mesh convention; we use vertex coordinate itself for normal in this case */
        for(i=0; i<numVerts; i++) {
                MVert *mv= &mverts[i];
                float *no= tnorms[i];
                
                if(normalize_v3(no) == 0.0f)
                        normalize_v3_v3(no, mv->co);

                normal_float_to_short_v3(mv->no, no);
        }
        
        MEM_freeN(tnorms);

        if(fnors != faceNors_r)
                MEM_freeN(fnors);
}

float (*mesh_getVertexCos(Mesh *me, int *numVerts_r))[3]
{
        int i, numVerts = me->totvert;
        float (*cos)[3] = MEM_mallocN(sizeof(*cos)*numVerts, "vertexcos1");
        
        if (numVerts_r) *numVerts_r = numVerts;
        for (i=0; i<numVerts; i++)
                VECCOPY(cos[i], me->mvert[i].co);
        
        return cos;
}

UvVertMap *make_uv_vert_map(struct MFace *mface, struct MTFace *tface, unsigned int totface, unsigned int totvert, int selected, float *limit)
{
        UvVertMap *vmap;
        UvMapVert *buf;
        MFace *mf;
        MTFace *tf;
        unsigned int a;
        int     i, totuv, nverts;

        totuv = 0;

        /* generate UvMapVert array */
        mf= mface;
        tf= tface;
        for(a=0; a<totface; a++, mf++, tf++)
                if(!selected || (!(mf->flag & ME_HIDE) && (mf->flag & ME_FACE_SEL)))
                        totuv += (mf->v4)? 4: 3;
                
        if(totuv==0)
                return NULL;
        
        vmap= (UvVertMap*)MEM_callocN(sizeof(*vmap), "UvVertMap");
        if (!vmap)
                return NULL;

        vmap->vert= (UvMapVert**)MEM_callocN(sizeof(*vmap->vert)*totvert, "UvMapVert*");
        buf= vmap->buf= (UvMapVert*)MEM_callocN(sizeof(*vmap->buf)*totuv, "UvMapVert");

        if (!vmap->vert || !vmap->buf) {
                free_uv_vert_map(vmap);
                return NULL;
        }

        mf= mface;
        tf= tface;
        for(a=0; a<totface; a++, mf++, tf++) {
                if(!selected || (!(mf->flag & ME_HIDE) && (mf->flag & ME_FACE_SEL))) {
                        nverts= (mf->v4)? 4: 3;

                        for(i=0; i<nverts; i++) {
                                buf->tfindex= i;
                                buf->f= a;
                                buf->separate = 0;
                                buf->next= vmap->vert[*(&mf->v1 + i)];
                                vmap->vert[*(&mf->v1 + i)]= buf;
                                buf++;
                        }
                }
        }
        
        /* sort individual uvs for each vert */
        tf= tface;
        for(a=0; a<totvert; a++) {
                UvMapVert *newvlist= NULL, *vlist=vmap->vert[a];
                UvMapVert *iterv, *v, *lastv, *next;
                float *uv, *uv2, uvdiff[2];

                while(vlist) {
                        v= vlist;
                        vlist= vlist->next;
                        v->next= newvlist;
                        newvlist= v;

                        uv= (tf+v->f)->uv[v->tfindex];
                        lastv= NULL;
                        iterv= vlist;

                        while(iterv) {
                                next= iterv->next;

                                uv2= (tf+iterv->f)->uv[iterv->tfindex];
                                sub_v2_v2v2(uvdiff, uv2, uv);


                                if(fabsf(uv[0]-uv2[0]) < limit[0] && fabsf(uv[1]-uv2[1]) < limit[1]) {
                                        if(lastv) lastv->next= next;
                                        else vlist= next;
                                        iterv->next= newvlist;
                                        newvlist= iterv;
                                }
                                else
                                        lastv=iterv;

                                iterv= next;
                        }

                        newvlist->separate = 1;
                }

                vmap->vert[a]= newvlist;
        }
        
        return vmap;
}

UvMapVert *get_uv_map_vert(UvVertMap *vmap, unsigned int v)
{
        return vmap->vert[v];
}

void free_uv_vert_map(UvVertMap *vmap)
{
        if (vmap) {
                if (vmap->vert) MEM_freeN(vmap->vert);
                if (vmap->buf) MEM_freeN(vmap->buf);
                MEM_freeN(vmap);
        }
}

/* Generates a map where the key is the vertex and the value is a list
   of faces that use that vertex as a corner. The lists are allocated
   from one memory pool. */
void create_vert_face_map(ListBase **map, IndexNode **mem, const MFace *mface, const int totvert, const int totface)
{
        int i,j;
        IndexNode *node = NULL;
        
        (*map) = MEM_callocN(sizeof(ListBase) * totvert, "vert face map");
        (*mem) = MEM_callocN(sizeof(IndexNode) * totface*4, "vert face map mem");
        node = *mem;
        
        /* Find the users */
        for(i = 0; i < totface; ++i){
                for(j = 0; j < (mface[i].v4?4:3); ++j, ++node) {
                        node->index = i;
                        BLI_addtail(&(*map)[((unsigned int*)(&mface[i]))[j]], node);
                }
        }
}

/* Generates a map where the key is the vertex and the value is a list
   of edges that use that vertex as an endpoint. The lists are allocated
   from one memory pool. */
void create_vert_edge_map(ListBase **map, IndexNode **mem, const MEdge *medge, const int totvert, const int totedge)
{
        int i, j;
        IndexNode *node = NULL;
 
        (*map) = MEM_callocN(sizeof(ListBase) * totvert, "vert edge map");
        (*mem) = MEM_callocN(sizeof(IndexNode) * totedge * 2, "vert edge map mem");
        node = *mem;

        /* Find the users */
        for(i = 0; i < totedge; ++i){
                for(j = 0; j < 2; ++j, ++node) {
                        node->index = i;
                        BLI_addtail(&(*map)[((unsigned int*)(&medge[i].v1))[j]], node);
                }
        }
}

/* Partial Mesh Visibility */
PartialVisibility *mesh_pmv_copy(PartialVisibility *pmv)
{
        PartialVisibility *n= MEM_dupallocN(pmv);
        n->vert_map= MEM_dupallocN(pmv->vert_map);
        n->edge_map= MEM_dupallocN(pmv->edge_map);
        n->old_edges= MEM_dupallocN(pmv->old_edges);
        n->old_faces= MEM_dupallocN(pmv->old_faces);
        return n;
}

void mesh_pmv_free(PartialVisibility *pv)
{
        MEM_freeN(pv->vert_map);
        MEM_freeN(pv->edge_map);
        MEM_freeN(pv->old_faces);
        MEM_freeN(pv->old_edges);
        MEM_freeN(pv);
}

void mesh_pmv_revert(Mesh *me)
{
        if(me->pv) {
                unsigned i;
                MVert *nve, *old_verts;
                
                /* Reorder vertices */
                nve= me->mvert;
                old_verts = MEM_mallocN(sizeof(MVert)*me->pv->totvert,"PMV revert verts");
                for(i=0; i<me->pv->totvert; ++i)
                        old_verts[i]= nve[me->pv->vert_map[i]];

                /* Restore verts, edges and faces */
                CustomData_free_layer_active(&me->vdata, CD_MVERT, me->totvert);
                CustomData_free_layer_active(&me->edata, CD_MEDGE, me->totedge);
                CustomData_free_layer_active(&me->fdata, CD_MFACE, me->totface);

                CustomData_add_layer(&me->vdata, CD_MVERT, CD_ASSIGN, old_verts, me->pv->totvert);
                CustomData_add_layer(&me->edata, CD_MEDGE, CD_ASSIGN, me->pv->old_edges, me->pv->totedge);
                CustomData_add_layer(&me->fdata, CD_MFACE, CD_ASSIGN, me->pv->old_faces, me->pv->totface);
                mesh_update_customdata_pointers(me);

                me->totvert= me->pv->totvert;
                me->totedge= me->pv->totedge;
                me->totface= me->pv->totface;

                me->pv->old_edges= NULL;
                me->pv->old_faces= NULL;

                /* Free maps */
                MEM_freeN(me->pv->edge_map);
                me->pv->edge_map= NULL;
                MEM_freeN(me->pv->vert_map);
                me->pv->vert_map= NULL;
        }
}

void mesh_pmv_off(Mesh *me)
{
        if(me->pv) {
                mesh_pmv_revert(me);
                MEM_freeN(me->pv);
                me->pv= NULL;
        }
}

/* basic vertex data functions */
int minmax_mesh(Mesh *me, float min[3], float max[3])
{
        int i= me->totvert;
        MVert *mvert;
        for(mvert= me->mvert; i--; mvert++) {
                DO_MINMAX(mvert->co, min, max);
        }
        
        return (me->totvert != 0);
}

int mesh_center_median(Mesh *me, float cent[3])
{
        int i= me->totvert;
        MVert *mvert;
        zero_v3(cent);
        for(mvert= me->mvert; i--; mvert++) {
                add_v3_v3(cent, mvert->co);
        }
        /* otherwise we get NAN for 0 verts */
        if(me->totvert) {
                mul_v3_fl(cent, 1.0f/(float)me->totvert);
        }

        return (me->totvert != 0);
}

int mesh_center_bounds(Mesh *me, float cent[3])
{
        float min[3], max[3];
        INIT_MINMAX(min, max);
        if(minmax_mesh(me, min, max)) {
                mid_v3_v3v3(cent, min, max);
                return 1;
        }

        return 0;
}

void mesh_translate(Mesh *me, float offset[3], int do_keys)
{
        int i= me->totvert;
        MVert *mvert;
        for(mvert= me->mvert; i--; mvert++) {
                add_v3_v3(mvert->co, offset);
        }
        
        if (do_keys && me->key) {
                KeyBlock *kb;
                for (kb=me->key->block.first; kb; kb=kb->next) {
                        float *fp= kb->data;
                        for (i= kb->totelem; i--; fp+=3) {
                                add_v3_v3(fp, offset);
                        }
                }
        }
}