MOD_solidify.c

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/*
* $Id: MOD_solidify.c 38300 2011-07-11 09:15:20Z blendix $
*
* ***** 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) 2005 by the Blender Foundation.
* All rights reserved.
*
* Contributor(s): Daniel Dunbar
*                 Ton Roosendaal,
*                 Ben Batt,
*                 Brecht Van Lommel,
*                 Campbell Barton
*
* ***** END GPL LICENSE BLOCK *****
*
*/

#include "DNA_meshdata_types.h"

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

#include "BKE_cdderivedmesh.h"
#include "BKE_mesh.h"
#include "BKE_particle.h"
#include "BKE_deform.h"


#include "MOD_modifiertypes.h"
#include "MOD_util.h"

#include "MEM_guardedalloc.h"

typedef struct EdgeFaceRef {
        int f1; /* init as -1 */
        int f2;
} EdgeFaceRef;

static void dm_calc_normal(DerivedMesh *dm, float (*temp_nors)[3])
{
        int i, numVerts, numEdges, numFaces;
        MFace *mface, *mf;
        MVert *mvert, *mv;

        float (*face_nors)[3];
        float *f_no;
        int calc_face_nors= 0;

        numVerts = dm->getNumVerts(dm);
        numEdges = dm->getNumEdges(dm);
        numFaces = dm->getNumFaces(dm);
        mface = dm->getFaceArray(dm);
        mvert = dm->getVertArray(dm);

        /* we don't want to overwrite any referenced layers */

        /*
        Dosnt work here!
        mv = CustomData_duplicate_referenced_layer(&dm->vertData, CD_MVERT);
        cddm->mvert = mv;
        */

        face_nors = CustomData_get_layer(&dm->faceData, CD_NORMAL);
        if(!face_nors) {
                calc_face_nors = 1;
                face_nors = CustomData_add_layer(&dm->faceData, CD_NORMAL, CD_CALLOC, NULL, numFaces);
        }

        mv = mvert;
        mf = mface;

        {
                EdgeHash *edge_hash = BLI_edgehash_new();
                EdgeHashIterator *edge_iter;
                int edge_ref_count = 0;
                int ed_v1, ed_v2; /* use when getting the key */
                EdgeFaceRef *edge_ref_array = MEM_callocN(numEdges * sizeof(EdgeFaceRef), "Edge Connectivity");
                EdgeFaceRef *edge_ref;
                float edge_normal[3];

                /* This function adds an edge hash if its not there, and adds the face index */
#define NOCALC_EDGEWEIGHT_ADD_EDGEREF_FACE(EDV1, EDV2); \
                                edge_ref = (EdgeFaceRef *)BLI_edgehash_lookup(edge_hash, EDV1, EDV2); \
                                if (!edge_ref) { \
                                        edge_ref = &edge_ref_array[edge_ref_count]; edge_ref_count++; \
                                        edge_ref->f1=i; \
                                        edge_ref->f2=-1; \
                                        BLI_edgehash_insert(edge_hash, EDV1, EDV2, edge_ref); \
                                } else { \
                                        edge_ref->f2=i; \
                                }

                for(i = 0; i < numFaces; i++, mf++) {
                        f_no = face_nors[i];

                        if(mf->v4) {
                                if(calc_face_nors)
                                        normal_quad_v3(f_no, mv[mf->v1].co, mv[mf->v2].co, mv[mf->v3].co, mv[mf->v4].co);

                                NOCALC_EDGEWEIGHT_ADD_EDGEREF_FACE(mf->v1, mf->v2);
                                NOCALC_EDGEWEIGHT_ADD_EDGEREF_FACE(mf->v2, mf->v3);
                                NOCALC_EDGEWEIGHT_ADD_EDGEREF_FACE(mf->v3, mf->v4);
                                NOCALC_EDGEWEIGHT_ADD_EDGEREF_FACE(mf->v4, mf->v1);
                        } else {
                                if(calc_face_nors)
                                        normal_tri_v3(f_no, mv[mf->v1].co, mv[mf->v2].co, mv[mf->v3].co);

                                NOCALC_EDGEWEIGHT_ADD_EDGEREF_FACE(mf->v1, mf->v2);
                                NOCALC_EDGEWEIGHT_ADD_EDGEREF_FACE(mf->v2, mf->v3);
                                NOCALC_EDGEWEIGHT_ADD_EDGEREF_FACE(mf->v3, mf->v1);
                        }
                }

                for(edge_iter = BLI_edgehashIterator_new(edge_hash); !BLI_edgehashIterator_isDone(edge_iter); BLI_edgehashIterator_step(edge_iter)) {
                        /* Get the edge vert indices, and edge value (the face indices that use it)*/
                        BLI_edgehashIterator_getKey(edge_iter, (int*)&ed_v1, (int*)&ed_v2);
                        edge_ref = BLI_edgehashIterator_getValue(edge_iter);

                        if (edge_ref->f2 != -1) {
                                /* We have 2 faces using this edge, calculate the edges normal
                                 * using the angle between the 2 faces as a weighting */
                                add_v3_v3v3(edge_normal, face_nors[edge_ref->f1], face_nors[edge_ref->f2]);
                                normalize_v3(edge_normal);
                                mul_v3_fl(edge_normal, angle_normalized_v3v3(face_nors[edge_ref->f1], face_nors[edge_ref->f2]));
                        } else {
                                /* only one face attached to that edge */
                                /* an edge without another attached- the weight on this is
                                 * undefined, M_PI/2 is 90d in radians and that seems good enough */
                                mul_v3_v3fl(edge_normal, face_nors[edge_ref->f1], M_PI/2);
                        }
                        add_v3_v3(temp_nors[ed_v1], edge_normal);
                        add_v3_v3(temp_nors[ed_v2], edge_normal);
                }
                BLI_edgehashIterator_free(edge_iter);
                BLI_edgehash_free(edge_hash, NULL);
                MEM_freeN(edge_ref_array);
        }

        /* normalize vertex normals and assign */
        for(i = 0; i < numVerts; i++, mv++) {
                if(normalize_v3(temp_nors[i]) == 0.0f) {
                        normal_short_to_float_v3(temp_nors[i], mv->no);
                }
        }
}
 
static void initData(ModifierData *md)
{
        SolidifyModifierData *smd = (SolidifyModifierData*) md;
        smd->offset = 0.01f;
        smd->offset_fac = -1.0f;
        smd->flag = MOD_SOLIDIFY_RIM;
}
 
static void copyData(ModifierData *md, ModifierData *target)
{
        SolidifyModifierData *smd = (SolidifyModifierData*) md;
        SolidifyModifierData *tsmd = (SolidifyModifierData*) target;
        tsmd->offset = smd->offset;
        tsmd->offset_fac = smd->offset_fac;
        tsmd->crease_inner = smd->crease_inner;
        tsmd->crease_outer = smd->crease_outer;
        tsmd->crease_rim = smd->crease_rim;
        tsmd->flag = smd->flag;
        strcpy(tsmd->defgrp_name, smd->defgrp_name);
}

static CustomDataMask requiredDataMask(Object *UNUSED(ob), ModifierData *md)
{
        SolidifyModifierData *smd = (SolidifyModifierData*) md;
        CustomDataMask dataMask = 0;

        /* ask for vertexgroups if we need them */
        if(smd->defgrp_name[0]) dataMask |= CD_MASK_MDEFORMVERT;

        return dataMask;
}


static DerivedMesh *applyModifier(ModifierData *md, Object *ob, 
                                                DerivedMesh *dm,
                                                int UNUSED(useRenderParams),
                                                int UNUSED(isFinalCalc))
{
        int i;
        DerivedMesh *result;
        const SolidifyModifierData *smd = (SolidifyModifierData*) md;

        MFace *mf, *mface, *orig_mface;
        MEdge *ed, *medge, *orig_medge;
        MVert *mv, *mvert, *orig_mvert;

        const int numVerts = dm->getNumVerts(dm);
        const int numEdges = dm->getNumEdges(dm);
        const int numFaces = dm->getNumFaces(dm);

        /* only use material offsets if we have 2 or more materials  */
        const short mat_nr_max= ob->totcol > 1 ? ob->totcol - 1 : 0;
        const short mat_ofs= mat_nr_max ? smd->mat_ofs : 0;
        const short mat_ofs_rim= mat_nr_max ? smd->mat_ofs_rim : 0;

        /* use for edges */
        int *new_vert_arr= NULL;
        int newFaces = 0;

        int *new_edge_arr= NULL;
        int newEdges = 0;

        int *edge_users= NULL;
        char *edge_order= NULL;

        float (*vert_nors)[3]= NULL;

        float const ofs_orig=                           - (((-smd->offset_fac + 1.0f) * 0.5f) * smd->offset);
        float const ofs_new= smd->offset        - (((-smd->offset_fac + 1.0f) * 0.5f) * smd->offset);

        /* weights */
        MDeformVert *dvert, *dv= NULL;
        const int defgrp_invert = ((smd->flag & MOD_SOLIDIFY_VGROUP_INV) != 0);
        int defgrp_index;

        modifier_get_vgroup(ob, dm, smd->defgrp_name, &dvert, &defgrp_index);

        orig_mface = dm->getFaceArray(dm);
        orig_medge = dm->getEdgeArray(dm);
        orig_mvert = dm->getVertArray(dm);

        if(smd->flag & MOD_SOLIDIFY_RIM) {
                EdgeHash *edgehash = BLI_edgehash_new();
                EdgeHashIterator *ehi;
                int v1, v2;
                int eidx;

                for(i=0, mv=orig_mvert; i<numVerts; i++, mv++) {
                        mv->flag &= ~ME_VERT_TMP_TAG;
                }

                for(i=0, ed=orig_medge; i<numEdges; i++, ed++) {
                        BLI_edgehash_insert(edgehash, ed->v1, ed->v2, SET_INT_IN_POINTER(i));
                }

#define INVALID_UNUSED -1
#define INVALID_PAIR -2

#define ADD_EDGE_USER(_v1, _v2, edge_ord) \
                eidx= GET_INT_FROM_POINTER(BLI_edgehash_lookup(edgehash, _v1, _v2)); \
                if(edge_users[eidx] == INVALID_UNUSED) { \
                        ed= orig_medge + eidx; \
                        edge_users[eidx]= (_v1 < _v2) == (ed->v1 < ed->v2) ? i:(i+numFaces); \
                        edge_order[eidx]= edge_ord; \
                } else { \
                        edge_users[eidx]= INVALID_PAIR; \
                } \


                edge_users= MEM_mallocN(sizeof(int) * numEdges, "solid_mod edges");
                edge_order= MEM_mallocN(sizeof(char) * numEdges, "solid_mod eorder");
                memset(edge_users, INVALID_UNUSED, sizeof(int) * numEdges);

                for(i=0, mf=orig_mface; i<numFaces; i++, mf++) {
                        if(mf->v4) {
                                ADD_EDGE_USER(mf->v1, mf->v2, 0);
                                ADD_EDGE_USER(mf->v2, mf->v3, 1);
                                ADD_EDGE_USER(mf->v3, mf->v4, 2);
                                ADD_EDGE_USER(mf->v4, mf->v1, 3);
                        }
                        else {
                                ADD_EDGE_USER(mf->v1, mf->v2, 0);
                                ADD_EDGE_USER(mf->v2, mf->v3, 1);
                                ADD_EDGE_USER(mf->v3, mf->v1, 2);
                        }
                }

#undef ADD_EDGE_USER
#undef INVALID_UNUSED
#undef INVALID_PAIR


                new_edge_arr= MEM_callocN(sizeof(int) * numEdges, "solid_mod arr");

                ehi= BLI_edgehashIterator_new(edgehash);
                for(; !BLI_edgehashIterator_isDone(ehi); BLI_edgehashIterator_step(ehi)) {
                        eidx= GET_INT_FROM_POINTER(BLI_edgehashIterator_getValue(ehi));
                        if(edge_users[eidx] >= 0) {
                                BLI_edgehashIterator_getKey(ehi, &v1, &v2);
                                orig_mvert[v1].flag |= ME_VERT_TMP_TAG;
                                orig_mvert[v2].flag |= ME_VERT_TMP_TAG;
                                new_edge_arr[newFaces]= eidx;
                                newFaces++;
                        }
                }
                BLI_edgehashIterator_free(ehi);



                new_vert_arr= MEM_callocN(sizeof(int) * numVerts, "solid_mod new_varr");
                for(i=0, mv=orig_mvert; i<numVerts; i++, mv++) {
                        if(mv->flag & ME_VERT_TMP_TAG) {
                                new_vert_arr[newEdges] = i;
                                newEdges++;

                                mv->flag &= ~ME_VERT_TMP_TAG;
                        }
                }

                BLI_edgehash_free(edgehash, NULL);
        }

        if(smd->flag & MOD_SOLIDIFY_NORMAL_CALC) {
                vert_nors= MEM_callocN(sizeof(float) * numVerts * 3, "mod_solid_vno_hq");
                dm_calc_normal(dm, vert_nors);
        }

        result = CDDM_from_template(dm, numVerts * 2, (numEdges * 2) + newEdges, (numFaces * 2) + newFaces);    

        mface = result->getFaceArray(result);
        medge = result->getEdgeArray(result);
        mvert = result->getVertArray(result);

        DM_copy_face_data(dm, result, 0, 0, numFaces);
        DM_copy_face_data(dm, result, 0, numFaces, numFaces);

        DM_copy_edge_data(dm, result, 0, 0, numEdges);
        DM_copy_edge_data(dm, result, 0, numEdges, numEdges);

        DM_copy_vert_data(dm, result, 0, 0, numVerts);
        DM_copy_vert_data(dm, result, 0, numVerts, numVerts);

        {
                static int corner_indices[4] = {2, 1, 0, 3};
                int is_quad;

                for(i=0, mf=mface+numFaces; i<numFaces; i++, mf++) {
                        mf->v1 += numVerts;
                        mf->v2 += numVerts;
                        mf->v3 += numVerts;
                        if(mf->v4)
                                mf->v4 += numVerts;

                        /* Flip face normal */
                        {
                                is_quad = mf->v4;
                                SWAP(int, mf->v1, mf->v3);
                                DM_swap_face_data(result, i+numFaces, corner_indices);
                                test_index_face(mf, &result->faceData, numFaces, is_quad ? 4:3);
                        }

                        if(mat_ofs) {
                                mf->mat_nr += mat_ofs;
                                CLAMP(mf->mat_nr, 0, mat_nr_max);
                        }
                }
        }

        for(i=0, ed=medge+numEdges; i<numEdges; i++, ed++) {
                ed->v1 += numVerts;
                ed->v2 += numVerts;
        }

        /* note, copied vertex layers dont have flipped normals yet. do this after applying offset */
        if((smd->flag & MOD_SOLIDIFY_EVEN) == 0) {
                /* no even thickness, very simple */
                float scalar_short;
                float scalar_short_vgroup;


                if(ofs_new != 0.0f) {
                        scalar_short= scalar_short_vgroup= ofs_new / 32767.0f;
                        mv= mvert + ((ofs_new >= ofs_orig) ? 0 : numVerts);
                        dv= dvert;
                        for(i=0; i<numVerts; i++, mv++) {
                                if(dv) {
                                        if(defgrp_invert)       scalar_short_vgroup = scalar_short * (1.0f - defvert_find_weight(dv, defgrp_index));
                                        else                            scalar_short_vgroup = scalar_short * defvert_find_weight(dv, defgrp_index);
                                        dv++;
                                }
                                VECADDFAC(mv->co, mv->co, mv->no, scalar_short_vgroup);
                        }
                }

                if(ofs_orig != 0.0f) {
                        scalar_short= scalar_short_vgroup= ofs_orig / 32767.0f;
                        mv= mvert + ((ofs_new >= ofs_orig) ? numVerts : 0); /* same as above but swapped, intentional use of 'ofs_new' */
                        dv= dvert;
                        for(i=0; i<numVerts; i++, mv++) {
                                if(dv) {
                                        if(defgrp_invert)       scalar_short_vgroup = scalar_short * (1.0f - defvert_find_weight(dv, defgrp_index));
                                        else                            scalar_short_vgroup = scalar_short * defvert_find_weight(dv, defgrp_index);
                                        dv++;
                                }
                                VECADDFAC(mv->co, mv->co, mv->no, scalar_short_vgroup);
                        }
                }

        }
        else {
                /* make a face normal layer if not present */
                float (*face_nors)[3];
                int face_nors_calc= 0;

                /* same as EM_solidify() in editmesh_lib.c */
                float *vert_angles= MEM_callocN(sizeof(float) * numVerts * 2, "mod_solid_pair"); /* 2 in 1 */
                float *vert_accum= vert_angles + numVerts;
                float face_angles[4];
                int j, vidx;

                face_nors = CustomData_get_layer(&dm->faceData, CD_NORMAL);
                if(!face_nors) {
                        face_nors = CustomData_add_layer(&dm->faceData, CD_NORMAL, CD_CALLOC, NULL, dm->numFaceData);
                        face_nors_calc= 1;
                }

                if(vert_nors==NULL) {
                        vert_nors= MEM_mallocN(sizeof(float) * numVerts * 3, "mod_solid_vno");
                        for(i=0, mv=mvert; i<numVerts; i++, mv++) {
                                normal_short_to_float_v3(vert_nors[i], mv->no);
                        }
                }

                for(i=0, mf=mface; i<numFaces; i++, mf++) {

                        /* just added, calc the normal */
                        if(face_nors_calc) {
                                if(mf->v4)
                                        normal_quad_v3(face_nors[i], mvert[mf->v1].co, mvert[mf->v2].co, mvert[mf->v3].co, mvert[mf->v4].co);
                                else
                                        normal_tri_v3(face_nors[i] , mvert[mf->v1].co, mvert[mf->v2].co, mvert[mf->v3].co);
                        }

                        if(mf->v4) {
                                angle_quad_v3(face_angles, mvert[mf->v1].co, mvert[mf->v2].co, mvert[mf->v3].co, mvert[mf->v4].co);
                                j= 3;
                        }
                        else {
                                angle_tri_v3(face_angles, mvert[mf->v1].co, mvert[mf->v2].co, mvert[mf->v3].co);
                                j= 2;
                        }

                        do {
                                vidx = *(&mf->v1 + j);
                                vert_accum[vidx] += face_angles[j];
                                vert_angles[vidx]+= shell_angle_to_dist(angle_normalized_v3v3(vert_nors[vidx], face_nors[i])) * face_angles[j];
                        } while(j--);
                }

                /* vertex group support */
                if(dvert) {
                        dv= dvert;
                        if(defgrp_invert) {
                                for(i=0; i<numVerts; i++, dv++) {
                                        vert_angles[i] *= (1.0f - defvert_find_weight(dv, defgrp_index));
                                }
                        }
                        else {
                                for(i=0; i<numVerts; i++, dv++) {
                                        vert_angles[i] *= defvert_find_weight(dv, defgrp_index);
                                }
                        }
                }

                if(ofs_new) {
                        mv= mvert + ((ofs_new >= ofs_orig) ? 0 : numVerts);

                        for(i=0; i<numVerts; i++, mv++) {
                                if(vert_accum[i]) { /* zero if unselected */
                                        madd_v3_v3fl(mv->co, vert_nors[i], ofs_new * (vert_angles[i] / vert_accum[i]));
                                }
                        }
                }

                if(ofs_orig) {
                        mv= mvert + ((ofs_new >= ofs_orig) ? numVerts : 0); /* same as above but swapped, intentional use of 'ofs_new' */

                        for(i=0; i<numVerts; i++, mv++) {
                                if(vert_accum[i]) { /* zero if unselected */
                                        madd_v3_v3fl(mv->co, vert_nors[i], ofs_orig * (vert_angles[i] / vert_accum[i]));
                                }
                        }
                }

                MEM_freeN(vert_angles);
        }

        if(vert_nors)
                MEM_freeN(vert_nors);

        /* flip vertex normals for copied verts */
        mv= mvert + numVerts;
        for(i=0; i<numVerts; i++, mv++) {
                mv->no[0]= -mv->no[0];
                mv->no[1]= -mv->no[1];
                mv->no[2]= -mv->no[2];
        }

        if(smd->flag & MOD_SOLIDIFY_RIM) {

                
                /* bugger, need to re-calculate the normals for the new edge faces.
                 * This could be done in many ways, but probably the quickest way is to calculate the average normals for side faces only.
                 * Then blend them with the normals of the edge verts.
                 * 
                 * at the moment its easiest to allocate an entire array for every vertex, even though we only need edge verts - campbell
                 */
                
#define SOLIDIFY_SIDE_NORMALS

#ifdef SOLIDIFY_SIDE_NORMALS
                /* annoying to allocate these since we only need the edge verts, */
                float (*edge_vert_nos)[3]= MEM_callocN(sizeof(float) * numVerts * 3, "solidify_edge_nos");
                float nor[3];
#endif
                const unsigned char crease_rim= smd->crease_rim * 255.0f;
                const unsigned char crease_outer= smd->crease_outer * 255.0f;
                const unsigned char crease_inner= smd->crease_inner * 255.0f;

                const int edge_indices[4][4] = {
                                {1, 0, 0, 1},
                                {2, 1, 1, 2},
                                {3, 2, 2, 3},
                                {0, 3, 3, 0}};

                /* add faces & edges */
                ed= medge + (numEdges * 2);
                for(i=0; i<newEdges; i++, ed++) {
                        ed->v1= new_vert_arr[i];
                        ed->v2= new_vert_arr[i] + numVerts;
                        ed->flag |= ME_EDGEDRAW;

                        if(crease_rim)
                                ed->crease= crease_rim;
                }

                /* faces */
                mf= mface + (numFaces * 2);
                for(i=0; i<newFaces; i++, mf++) {
                        int eidx= new_edge_arr[i];
                        int fidx= edge_users[eidx];
                        int flip;

                        if(fidx >= numFaces) {
                                fidx -= numFaces;
                                flip= 1;
                        }
                        else {
                                flip= 0;
                        }

                        ed= medge + eidx;

                        /* copy most of the face settings */
                        DM_copy_face_data(dm, result, fidx, (numFaces * 2) + i, 1);

                        if(flip) {
                                DM_swap_face_data(result, (numFaces * 2) + i, edge_indices[edge_order[eidx]]);

                                mf->v1= ed->v1;
                                mf->v2= ed->v2;
                                mf->v3= ed->v2 + numVerts;
                                mf->v4= ed->v1 + numVerts;
                        }
                        else {
                                DM_swap_face_data(result, (numFaces * 2) + i, edge_indices[edge_order[eidx]]);

                                mf->v1= ed->v2;
                                mf->v2= ed->v1;
                                mf->v3= ed->v1 + numVerts;
                                mf->v4= ed->v2 + numVerts;
                        }
                        
                        /* use the next material index if option enabled */
                        if(mat_ofs_rim) {
                                mf->mat_nr += mat_ofs_rim;
                                CLAMP(mf->mat_nr, 0, mat_nr_max);
                        }
                        if(crease_outer) {
                                /* crease += crease_outer; without wrapping */
                                unsigned char *cr= (unsigned char *)&(ed->crease);
                                int tcr= *cr + crease_outer;
                                *cr= tcr > 255 ? 255 : tcr;
                        }

                        if(crease_inner) {
                                /* crease += crease_inner; without wrapping */
                                unsigned char *cr= (unsigned char *)&(medge[numEdges + eidx].crease);
                                int tcr= *cr + crease_inner;
                                *cr= tcr > 255 ? 255 : tcr;
                        }
                        
#ifdef SOLIDIFY_SIDE_NORMALS
                        normal_quad_v3(nor, mvert[mf->v1].co, mvert[mf->v2].co, mvert[mf->v3].co, mvert[mf->v4].co);

                        add_v3_v3(edge_vert_nos[ed->v1], nor);
                        add_v3_v3(edge_vert_nos[ed->v2], nor);
#endif
                }
                
#ifdef SOLIDIFY_SIDE_NORMALS
                ed= medge + (numEdges * 2);
                for(i=0; i<newEdges; i++, ed++) {
                        float nor_cpy[3];
                        short *nor_short;
                        int j;
                        
                        /* note, only the first vertex (lower half of the index) is calculated */
                        normalize_v3_v3(nor_cpy, edge_vert_nos[ed->v1]);
                        
                        for(j=0; j<2; j++) { /* loop over both verts of the edge */
                                nor_short= mvert[*(&ed->v1 + j)].no;
                                normal_short_to_float_v3(nor, nor_short);
                                add_v3_v3(nor, nor_cpy);
                                normalize_v3(nor);
                                normal_float_to_short_v3(nor_short, nor);
                        }
                }

                MEM_freeN(edge_vert_nos);
#endif

                MEM_freeN(new_vert_arr);
                MEM_freeN(new_edge_arr);
                MEM_freeN(edge_users);
                MEM_freeN(edge_order);
        }

        /* must recalculate normals with vgroups since they can displace unevenly [#26888] */
        if(dvert) {
                CDDM_calc_normals(result);
        }

        return result;
}

#undef SOLIDIFY_SIDE_NORMALS

static DerivedMesh *applyModifierEM(ModifierData *md,
                                                         Object *ob,
                                                         struct EditMesh *UNUSED(editData),
                                                         DerivedMesh *derivedData)
{
        return applyModifier(md, ob, derivedData, 0, 1);
}


ModifierTypeInfo modifierType_Solidify = {
        /* name */              "Solidify",
        /* structName */        "SolidifyModifierData",
        /* structSize */        sizeof(SolidifyModifierData),
        /* type */              eModifierTypeType_Constructive,

        /* flags */             eModifierTypeFlag_AcceptsMesh
                                                        | eModifierTypeFlag_AcceptsCVs
                                                        | eModifierTypeFlag_SupportsMapping
                                                        | eModifierTypeFlag_SupportsEditmode
                                                        | eModifierTypeFlag_EnableInEditmode,

        /* copyData */          copyData,
        /* deformVerts */       NULL,
        /* deformMatrices */    NULL,
        /* deformVertsEM */     NULL,
        /* deformMatricesEM */  NULL,
        /* applyModifier */     applyModifier,
        /* applyModifierEM */   applyModifierEM,
        /* initData */          initData,
        /* requiredDataMask */  requiredDataMask,
        /* freeData */          NULL,
        /* isDisabled */        NULL,
        /* updateDepgraph */    NULL,
        /* dependsOnTime */     NULL,
        /* dependsOnNormals */  NULL,
        /* foreachObjectLink */ NULL,
        /* foreachIDLink */     NULL
};