MOD_explode.c

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/*
 * ***** 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 "DNA_scene_types.h"

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

#include "BKE_cdderivedmesh.h"
#include "BKE_deform.h"
#include "BKE_lattice.h"
#include "BKE_mesh.h"
#include "BKE_modifier.h"
#include "BKE_object.h"
#include "BKE_particle.h"
#include "BKE_scene.h"


#include "MEM_guardedalloc.h"

#include "MOD_util.h"

static void initData(ModifierData *md)
{
    ExplodeModifierData *emd= (ExplodeModifierData*) md;

    emd->facepa= NULL;
    emd->flag |= eExplodeFlag_Unborn+eExplodeFlag_Alive+eExplodeFlag_Dead;
}
static void freeData(ModifierData *md)
{
    ExplodeModifierData *emd= (ExplodeModifierData*) md;
    
    if(emd->facepa) MEM_freeN(emd->facepa);
}
static void copyData(ModifierData *md, ModifierData *target)
{
    ExplodeModifierData *emd= (ExplodeModifierData*) md;
    ExplodeModifierData *temd= (ExplodeModifierData*) target;

    temd->facepa = NULL;
    temd->flag = emd->flag;
    temd->protect = emd->protect;
    temd->vgroup = emd->vgroup;
}
static int dependsOnTime(ModifierData *UNUSED(md)) 
{
    return 1;
}
static CustomDataMask requiredDataMask(Object *UNUSED(ob), ModifierData *md)
{
    ExplodeModifierData *emd= (ExplodeModifierData*) md;
    CustomDataMask dataMask = 0;

    if(emd->vgroup)
        dataMask |= CD_MASK_MDEFORMVERT;

    return dataMask;
}

static void createFacepa(ExplodeModifierData *emd,
                        ParticleSystemModifierData *psmd,
                        DerivedMesh *dm)
{
    ParticleSystem *psys=psmd->psys;
    MFace *fa=NULL, *mface=NULL;
    MVert *mvert = NULL;
    ParticleData *pa;
    KDTree *tree;
    float center[3], co[3];
    int *facepa=NULL,*vertpa=NULL,totvert=0,totface=0,totpart=0;
    int i,p,v1,v2,v3,v4=0;

    mvert = dm->getVertArray(dm);
    mface = dm->getFaceArray(dm);
    totface= dm->getNumFaces(dm);
    totvert= dm->getNumVerts(dm);
    totpart= psmd->psys->totpart;

    BLI_srandom(psys->seed);

    if(emd->facepa)
        MEM_freeN(emd->facepa);

    facepa = emd->facepa = MEM_callocN(sizeof(int)*totface, "explode_facepa");

    vertpa = MEM_callocN(sizeof(int)*totvert, "explode_vertpa");

    /* initialize all faces & verts to no particle */
    for(i=0; i<totface; i++)
        facepa[i]=totpart;

    for (i=0; i<totvert; i++)
        vertpa[i]=totpart;

    /* set protected verts */
    if(emd->vgroup){
        MDeformVert *dvert = dm->getVertDataArray(dm, CD_MDEFORMVERT);
        if(dvert){
            const int defgrp_index= emd->vgroup-1;
            for(i=0; i<totvert; i++, dvert++){
                float val = BLI_frand();
                val = (1.0f-emd->protect)*val + emd->protect*0.5f;
                if(val < defvert_find_weight(dvert, defgrp_index))
                    vertpa[i] = -1;
            }
        }
    }

    /* make tree of emitter locations */
    tree=BLI_kdtree_new(totpart);
    for(p=0,pa=psys->particles; p<totpart; p++,pa++){
        psys_particle_on_emitter(psmd,psys->part->from,pa->num,pa->num_dmcache,pa->fuv,pa->foffset,co,NULL,NULL,NULL,NULL,NULL);
        BLI_kdtree_insert(tree, p, co, NULL);
    }
    BLI_kdtree_balance(tree);

    /* set face-particle-indexes to nearest particle to face center */
    for(i=0,fa=mface; i<totface; i++,fa++){
        add_v3_v3v3(center,mvert[fa->v1].co,mvert[fa->v2].co);
        add_v3_v3(center, mvert[fa->v3].co);
        if(fa->v4){
            add_v3_v3(center, mvert[fa->v4].co);
            mul_v3_fl(center,0.25);
        }
        else
            mul_v3_fl(center,0.3333f);

        p= BLI_kdtree_find_nearest(tree,center,NULL,NULL);

        v1=vertpa[fa->v1];
        v2=vertpa[fa->v2];
        v3=vertpa[fa->v3];
        if(fa->v4)
            v4=vertpa[fa->v4];

        if(v1>=0 && v2>=0 && v3>=0 && (fa->v4==0 || v4>=0))
            facepa[i]=p;

        if(v1>=0) vertpa[fa->v1]=p;
        if(v2>=0) vertpa[fa->v2]=p;
        if(v3>=0) vertpa[fa->v3]=p;
        if(fa->v4 && v4>=0) vertpa[fa->v4]=p;
    }

    if(vertpa) MEM_freeN(vertpa);
    BLI_kdtree_free(tree);
}

static int edgecut_get(EdgeHash *edgehash, int v1, int v2)
{
    return GET_INT_FROM_POINTER(BLI_edgehash_lookup(edgehash, v1, v2));
}

 
static const short add_faces[24] = {
    0,
    0, 0, 2, 0, 1, 2, 2, 0, 2, 1,
    2, 2, 2, 2, 3, 0, 0, 0, 1, 0,
    1, 1, 2
 };

static MFace *get_dface(DerivedMesh *dm, DerivedMesh *split, int cur, int i, MFace *mf)
{
    MFace *df = CDDM_get_face(split, cur);
    DM_copy_face_data(dm, split, i, cur, 1);
    *df = *mf;
    return df;
}

#define SET_VERTS(a, b, c, d) \
            v[0]=mf->v##a; uv[0]=a-1; \
            v[1]=mf->v##b; uv[1]=b-1; \
            v[2]=mf->v##c; uv[2]=c-1; \
            v[3]=mf->v##d; uv[3]=d-1;

#define GET_ES(v1, v2) edgecut_get(eh, v1, v2);
#define INT_UV(uvf, c0, c1) interp_v2_v2v2(uvf, mf->uv[c0], mf->uv[c1], 0.5f);

static void remap_faces_3_6_9_12(DerivedMesh *dm, DerivedMesh *split, MFace *mf, int *facepa, int *vertpa, int i, EdgeHash *eh, int cur, int v1, int v2, int v3, int v4)
{
    MFace *df1 = get_dface(dm, split, cur, i, mf);
    MFace *df2 = get_dface(dm, split, cur+1, i, mf);
    MFace *df3 = get_dface(dm, split, cur+2, i, mf);

    facepa[cur] = vertpa[v1];
    df1->v1 = v1;
    df1->v2 = GET_ES(v1, v2)
    df1->v3 = GET_ES(v2, v3)
    df1->v4 = v3;
    df1->flag |= ME_FACE_SEL;

    facepa[cur+1] = vertpa[v2];
    df2->v1 = GET_ES(v1, v2)
    df2->v2 = v2;
    df2->v3 = GET_ES(v2, v3)
    df2->v4 = 0;
    df2->flag &= ~ME_FACE_SEL;

    facepa[cur+2] = vertpa[v1];
    df3->v1 = v1;
    df3->v2 = v3;
    df3->v3 = v4;
    df3->v4 = 0;
    df3->flag &= ~ME_FACE_SEL;
}

static void remap_uvs_3_6_9_12(DerivedMesh *dm, DerivedMesh *split, int numlayer, int i, int cur, int c0, int c1, int c2, int c3)
{
    MTFace *mf, *df1, *df2, *df3;
    int l;

    for(l=0; l<numlayer; l++) {
        mf = CustomData_get_layer_n(&split->faceData, CD_MTFACE, l);
        df1 = mf+cur;
        df2 = df1 + 1;
        df3 = df1 + 2;
        mf = CustomData_get_layer_n(&dm->faceData, CD_MTFACE, l);
        mf += i;

        copy_v2_v2(df1->uv[0], mf->uv[c0]);
        INT_UV(df1->uv[1], c0, c1)
        INT_UV(df1->uv[2], c1, c2)
        copy_v2_v2(df1->uv[3], mf->uv[c2]);

        INT_UV(df2->uv[0], c0, c1)
        copy_v2_v2(df2->uv[1], mf->uv[c1]);
        INT_UV(df2->uv[2], c1, c2)

        copy_v2_v2(df3->uv[0], mf->uv[c0]);
        copy_v2_v2(df3->uv[1], mf->uv[c2]);
        copy_v2_v2(df3->uv[2], mf->uv[c3]);
    }
}

static void remap_faces_5_10(DerivedMesh *dm, DerivedMesh *split, MFace *mf, int *facepa, int *vertpa, int i, EdgeHash *eh, int cur, int v1, int v2, int v3, int v4)
{
    MFace *df1 = get_dface(dm, split, cur, i, mf);
    MFace *df2 = get_dface(dm, split, cur+1, i, mf);

    facepa[cur] = vertpa[v1];
    df1->v1 = v1;
    df1->v2 = v2;
    df1->v3 = GET_ES(v2, v3)
    df1->v4 = GET_ES(v1, v4)
    df1->flag |= ME_FACE_SEL;

    facepa[cur+1] = vertpa[v3];
    df2->v1 = GET_ES(v1, v4)
    df2->v2 = GET_ES(v2, v3)
    df2->v3 = v3;
    df2->v4 = v4;
    df2->flag |= ME_FACE_SEL;
}

static void remap_uvs_5_10(DerivedMesh *dm, DerivedMesh *split, int numlayer, int i, int cur, int c0, int c1, int c2, int c3)
{
    MTFace *mf, *df1, *df2;
    int l;

    for(l=0; l<numlayer; l++) {
        mf = CustomData_get_layer_n(&split->faceData, CD_MTFACE, l);
        df1 = mf+cur;
        df2 = df1 + 1;
        mf = CustomData_get_layer_n(&dm->faceData, CD_MTFACE, l);
        mf += i;

        copy_v2_v2(df1->uv[0], mf->uv[c0]);
        copy_v2_v2(df1->uv[1], mf->uv[c1]);
        INT_UV(df1->uv[2], c1, c2)
        INT_UV(df1->uv[3], c0, c3)

        INT_UV(df2->uv[0], c0, c3)
        INT_UV(df2->uv[1], c1, c2)
        copy_v2_v2(df2->uv[2], mf->uv[c2]);
        copy_v2_v2(df2->uv[3], mf->uv[c3]);

    }
}

static void remap_faces_15(DerivedMesh *dm, DerivedMesh *split, MFace *mf, int *facepa, int *vertpa, int i, EdgeHash *eh, int cur, int v1, int v2, int v3, int v4)
{
    MFace *df1 = get_dface(dm, split, cur, i, mf);
    MFace *df2 = get_dface(dm, split, cur+1, i, mf);
    MFace *df3 = get_dface(dm, split, cur+2, i, mf);
    MFace *df4 = get_dface(dm, split, cur+3, i, mf);

    facepa[cur] = vertpa[v1];
    df1->v1 = v1;
    df1->v2 = GET_ES(v1, v2)
    df1->v3 = GET_ES(v1, v3)
    df1->v4 = GET_ES(v1, v4)
    df1->flag |= ME_FACE_SEL;

    facepa[cur+1] = vertpa[v2];
    df2->v1 = GET_ES(v1, v2)
    df2->v2 = v2;
    df2->v3 = GET_ES(v2, v3)
    df2->v4 = GET_ES(v1, v3)
    df2->flag |= ME_FACE_SEL;

    facepa[cur+2] = vertpa[v3];
    df3->v1 = GET_ES(v1, v3)
    df3->v2 = GET_ES(v2, v3)
    df3->v3 = v3;
    df3->v4 = GET_ES(v3, v4)
    df3->flag |= ME_FACE_SEL;

    facepa[cur+3] = vertpa[v4];
    df4->v1 = GET_ES(v1, v4)
    df4->v2 = GET_ES(v1, v3)
    df4->v3 = GET_ES(v3, v4)
    df4->v4 = v4;
    df4->flag |= ME_FACE_SEL;
}

static void remap_uvs_15(DerivedMesh *dm, DerivedMesh *split, int numlayer, int i, int cur, int c0, int c1, int c2, int c3)
{
    MTFace *mf, *df1, *df2, *df3, *df4;
    int l;

    for(l=0; l<numlayer; l++) {
        mf = CustomData_get_layer_n(&split->faceData, CD_MTFACE, l);
        df1 = mf+cur;
        df2 = df1 + 1;
        df3 = df1 + 2;
        df4 = df1 + 3;
        mf = CustomData_get_layer_n(&dm->faceData, CD_MTFACE, l);
        mf += i;

        copy_v2_v2(df1->uv[0], mf->uv[c0]);
        INT_UV(df1->uv[1], c0, c1)
        INT_UV(df1->uv[2], c0, c2)
        INT_UV(df1->uv[3], c0, c3)

        INT_UV(df2->uv[0], c0, c1)
        copy_v2_v2(df2->uv[1], mf->uv[c1]);
        INT_UV(df2->uv[2], c1, c2)
        INT_UV(df2->uv[3], c0, c2)

        INT_UV(df3->uv[0], c0, c2)
        INT_UV(df3->uv[1], c1, c2)
        copy_v2_v2(df3->uv[2], mf->uv[c2]);
        INT_UV(df3->uv[3], c2, c3)

        INT_UV(df4->uv[0], c0, c3)
        INT_UV(df4->uv[1], c0, c2)
        INT_UV(df4->uv[2], c2, c3)
        copy_v2_v2(df4->uv[3], mf->uv[c3]);
    }
}

static void remap_faces_7_11_13_14(DerivedMesh *dm, DerivedMesh *split, MFace *mf, int *facepa, int *vertpa, int i, EdgeHash *eh, int cur, int v1, int v2, int v3, int v4)
{
    MFace *df1 = get_dface(dm, split, cur, i, mf);
    MFace *df2 = get_dface(dm, split, cur+1, i, mf);
    MFace *df3 = get_dface(dm, split, cur+2, i, mf);

    facepa[cur] = vertpa[v1];
    df1->v1 = v1;
    df1->v2 = GET_ES(v1, v2)
    df1->v3 = GET_ES(v2, v3)
    df1->v4 = GET_ES(v1, v4)
    df1->flag |= ME_FACE_SEL;

    facepa[cur+1] = vertpa[v2];
    df2->v1 = GET_ES(v1, v2)
    df2->v2 = v2;
    df2->v3 = GET_ES(v2, v3)
    df2->v4 = 0;
    df2->flag &= ~ME_FACE_SEL;

    facepa[cur+2] = vertpa[v4];
    df3->v1 = GET_ES(v1, v4)
    df3->v2 = GET_ES(v2, v3)
    df3->v3 = v3;
    df3->v4 = v4;
    df3->flag |= ME_FACE_SEL;
}

static void remap_uvs_7_11_13_14(DerivedMesh *dm, DerivedMesh *split, int numlayer, int i, int cur, int c0, int c1, int c2, int c3)
{
    MTFace *mf, *df1, *df2, *df3;
    int l;

    for(l=0; l<numlayer; l++) {
        mf = CustomData_get_layer_n(&split->faceData, CD_MTFACE, l);
        df1 = mf+cur;
        df2 = df1 + 1;
        df3 = df1 + 2;
        mf = CustomData_get_layer_n(&dm->faceData, CD_MTFACE, l);
        mf += i;

        copy_v2_v2(df1->uv[0], mf->uv[c0]);
        INT_UV(df1->uv[1], c0, c1)
        INT_UV(df1->uv[2], c1, c2)
        INT_UV(df1->uv[3], c0, c3)

        INT_UV(df2->uv[0], c0, c1)
        copy_v2_v2(df2->uv[1], mf->uv[c1]);
        INT_UV(df2->uv[2], c1, c2)

        INT_UV(df3->uv[0], c0, c3)
        INT_UV(df3->uv[1], c1, c2)
        copy_v2_v2(df3->uv[2], mf->uv[c2]);
        copy_v2_v2(df3->uv[3], mf->uv[c3]);
    }
}

static void remap_faces_19_21_22(DerivedMesh *dm, DerivedMesh *split, MFace *mf, int *facepa, int *vertpa, int i, EdgeHash *eh, int cur, int v1, int v2, int v3)
{
    MFace *df1 = get_dface(dm, split, cur, i, mf);
    MFace *df2 = get_dface(dm, split, cur+1, i, mf);

    facepa[cur] = vertpa[v1];
    df1->v1 = v1;
    df1->v2 = GET_ES(v1, v2)
    df1->v3 = GET_ES(v1, v3)
    df1->v4 = 0;
    df1->flag &= ~ME_FACE_SEL;

    facepa[cur+1] = vertpa[v2];
    df2->v1 = GET_ES(v1, v2)
    df2->v2 = v2;
    df2->v3 = v3;
    df2->v4 = GET_ES(v1, v3)
    df2->flag |= ME_FACE_SEL;
}

static void remap_uvs_19_21_22(DerivedMesh *dm, DerivedMesh *split, int numlayer, int i, int cur, int c0, int c1, int c2)
{
    MTFace *mf, *df1, *df2;
    int l;

    for(l=0; l<numlayer; l++) {
        mf = CustomData_get_layer_n(&split->faceData, CD_MTFACE, l);
        df1 = mf+cur;
        df2 = df1 + 1;
        mf = CustomData_get_layer_n(&dm->faceData, CD_MTFACE, l);
        mf += i;

        copy_v2_v2(df1->uv[0], mf->uv[c0]);
        INT_UV(df1->uv[1], c0, c1)
        INT_UV(df1->uv[2], c0, c2)

        INT_UV(df2->uv[0], c0, c1)
        copy_v2_v2(df2->uv[1], mf->uv[c1]);
        copy_v2_v2(df2->uv[2], mf->uv[c2]);
        INT_UV(df2->uv[3], c0, c2)
    }
}

static void remap_faces_23(DerivedMesh *dm, DerivedMesh *split, MFace *mf, int *facepa, int *vertpa, int i, EdgeHash *eh, int cur, int v1, int v2, int v3)
{
    MFace *df1 = get_dface(dm, split, cur, i, mf);
    MFace *df2 = get_dface(dm, split, cur+1, i, mf);
    MFace *df3 = get_dface(dm, split, cur+2, i, mf);

    facepa[cur] = vertpa[v1];
    df1->v1 = v1;
    df1->v2 = GET_ES(v1, v2)
    df1->v3 = GET_ES(v2, v3)
    df1->v4 = GET_ES(v1, v3)
    df1->flag |= ME_FACE_SEL;

    facepa[cur+1] = vertpa[v2];
    df2->v1 = GET_ES(v1, v2)
    df2->v2 = v2;
    df2->v3 = GET_ES(v2, v3)
    df2->v4 = 0;
    df2->flag &= ~ME_FACE_SEL;

    facepa[cur+2] = vertpa[v3];
    df3->v1 = GET_ES(v1, v3)
    df3->v2 = GET_ES(v2, v3)
    df3->v3 = v3;
    df3->v4 = 0;
    df3->flag &= ~ME_FACE_SEL;
}

static void remap_uvs_23(DerivedMesh *dm, DerivedMesh *split, int numlayer, int i, int cur, int c0, int c1, int c2)
{
    MTFace *mf, *df1, *df2;
    int l;

    for(l=0; l<numlayer; l++) {
        mf = CustomData_get_layer_n(&split->faceData, CD_MTFACE, l);
        df1 = mf+cur;
        df2 = df1 + 1;
        mf = CustomData_get_layer_n(&dm->faceData, CD_MTFACE, l);
        mf += i;

        copy_v2_v2(df1->uv[0], mf->uv[c0]);
        INT_UV(df1->uv[1], c0, c1)
        INT_UV(df1->uv[2], c1, c2)
        INT_UV(df1->uv[3], c0, c2)

        INT_UV(df2->uv[0], c0, c1)
        copy_v2_v2(df2->uv[1], mf->uv[c1]);
        INT_UV(df2->uv[2], c1, c2)

        INT_UV(df2->uv[0], c0, c2)
        INT_UV(df2->uv[1], c1, c2)
        copy_v2_v2(df2->uv[2], mf->uv[c2]);
    }
}

static DerivedMesh * cutEdges(ExplodeModifierData *emd, DerivedMesh *dm)
{
    DerivedMesh *splitdm;
    MFace *mf=NULL,*df1=NULL;
    MFace *mface=dm->getFaceArray(dm);
    MVert *dupve, *mv;
    EdgeHash *edgehash;
    EdgeHashIterator *ehi;
    int totvert=dm->getNumVerts(dm);
    int totface=dm->getNumFaces(dm);

    int *facesplit = MEM_callocN(sizeof(int)*totface,"explode_facesplit");
    int *vertpa = MEM_callocN(sizeof(int)*totvert,"explode_vertpa2");
    int *facepa = emd->facepa;
    int *fs, totesplit=0,totfsplit=0,curdupface=0;
    int i, v1, v2, v3, v4, esplit,
        v[4]  = {0, 0, 0, 0}, /* To quite gcc barking... */
        uv[4] = {0, 0, 0, 0}; /* To quite gcc barking... */
    int numlayer;
    unsigned int ed_v1, ed_v2;

    edgehash= BLI_edgehash_new();

    /* recreate vertpa from facepa calculation */
    for (i=0,mf=mface; i<totface; i++,mf++) {
        vertpa[mf->v1]=facepa[i];
        vertpa[mf->v2]=facepa[i];
        vertpa[mf->v3]=facepa[i];
        if(mf->v4)
            vertpa[mf->v4]=facepa[i];
    }

    /* mark edges for splitting and how to split faces */
    for (i=0,mf=mface,fs=facesplit; i<totface; i++,mf++,fs++) {
        v1=vertpa[mf->v1];
        v2=vertpa[mf->v2];
        v3=vertpa[mf->v3];

        if(v1!=v2){
            BLI_edgehash_insert(edgehash, mf->v1, mf->v2, NULL);
            (*fs) |= 1;
        }

        if(v2!=v3){
            BLI_edgehash_insert(edgehash, mf->v2, mf->v3, NULL);
            (*fs) |= 2;
        }

        if(mf->v4){
            v4=vertpa[mf->v4];

            if(v3!=v4){
                BLI_edgehash_insert(edgehash, mf->v3, mf->v4, NULL);
                (*fs) |= 4;
            }

            if(v1!=v4){
                BLI_edgehash_insert(edgehash, mf->v1, mf->v4, NULL);
                (*fs) |= 8;
            }

            /* mark center vertex as a fake edge split */
            if(*fs == 15)
                BLI_edgehash_insert(edgehash, mf->v1, mf->v3, NULL);
        }
        else {
            (*fs) |= 16; /* mark face as tri */

            if(v1!=v3){
                BLI_edgehash_insert(edgehash, mf->v1, mf->v3, NULL);
                (*fs) |= 4;
            }
        }
    }

    /* count splits & create indexes for new verts */
    ehi= BLI_edgehashIterator_new(edgehash);
    totesplit=totvert;
    for(; !BLI_edgehashIterator_isDone(ehi); BLI_edgehashIterator_step(ehi)) {
        BLI_edgehashIterator_setValue(ehi, SET_INT_IN_POINTER(totesplit));
        totesplit++;
    }
    BLI_edgehashIterator_free(ehi);

    /* count new faces due to splitting */
    for(i=0,fs=facesplit; i<totface; i++,fs++)
        totfsplit += add_faces[*fs];
    
    splitdm= CDDM_from_template(dm, totesplit, 0, totface+totfsplit);
    numlayer = CustomData_number_of_layers(&splitdm->faceData, CD_MTFACE);

    /* copy new faces & verts (is it really this painful with custom data??) */
    for(i=0; i<totvert; i++){
        MVert source;
        MVert *dest;
        dm->getVert(dm, i, &source);
        dest = CDDM_get_vert(splitdm, i);

        DM_copy_vert_data(dm, splitdm, i, i, 1);
        *dest = source;
    }

    /* override original facepa (original pointer is saved in caller function) */
    facepa= MEM_callocN(sizeof(int)*(totface+totfsplit),"explode_facepa");
    //memcpy(facepa,emd->facepa,totface*sizeof(int));
    emd->facepa=facepa;

    /* create new verts */
    ehi= BLI_edgehashIterator_new(edgehash);
    for(; !BLI_edgehashIterator_isDone(ehi); BLI_edgehashIterator_step(ehi)) {
        BLI_edgehashIterator_getKey(ehi, &ed_v1, &ed_v2);
        esplit= GET_INT_FROM_POINTER(BLI_edgehashIterator_getValue(ehi));
        mv=CDDM_get_vert(splitdm, ed_v2);
        dupve=CDDM_get_vert(splitdm,esplit);

        DM_copy_vert_data(splitdm,splitdm, ed_v2, esplit,1);

        *dupve=*mv;

        mv=CDDM_get_vert(splitdm, ed_v1);

        add_v3_v3(dupve->co, mv->co);
        mul_v3_fl(dupve->co, 0.5f);
    }
    BLI_edgehashIterator_free(ehi);

    /* create new faces */
    curdupface=0;//=totface;
    //curdupin=totesplit;
    for(i=0,fs=facesplit; i<totface; i++,fs++){
        mf = dm->getFaceData(dm, i, CD_MFACE);

        switch(*fs) {
        case 3:
        case 10:
        case 11:
        case 15:
            SET_VERTS(1, 2, 3, 4)
            break;
        case 5:
        case 6:
        case 7:
            SET_VERTS(2, 3, 4, 1)
            break;
        case 9:
        case 13:
            SET_VERTS(4, 1, 2, 3)
            break;
        case 12:
        case 14:
            SET_VERTS(3, 4, 1, 2)
            break;
        case 21:
        case 23:
            SET_VERTS(1, 2, 3, 4)
            break;
        case 19:
            SET_VERTS(2, 3, 1, 4)
            break;
        case 22:
            SET_VERTS(3, 1, 2, 4)
            break;
        }

        switch(*fs) {
        case 3:
        case 6:
        case 9:
        case 12:
            remap_faces_3_6_9_12(dm, splitdm, mf, facepa, vertpa, i, edgehash, curdupface, v[0], v[1], v[2], v[3]);
            if(numlayer)
                remap_uvs_3_6_9_12(dm, splitdm, numlayer, i, curdupface, uv[0], uv[1], uv[2], uv[3]);
            break;
        case 5:
        case 10:
            remap_faces_5_10(dm, splitdm, mf, facepa, vertpa, i, edgehash, curdupface, v[0], v[1], v[2], v[3]);
            if(numlayer)
                remap_uvs_5_10(dm, splitdm, numlayer, i, curdupface, uv[0], uv[1], uv[2], uv[3]);
            break;
        case 15:
            remap_faces_15(dm, splitdm, mf, facepa, vertpa, i, edgehash, curdupface, v[0], v[1], v[2], v[3]);
            if(numlayer)
                remap_uvs_15(dm, splitdm, numlayer, i, curdupface, uv[0], uv[1], uv[2], uv[3]);
            break;
        case 7:
        case 11:
        case 13:
        case 14:
            remap_faces_7_11_13_14(dm, splitdm, mf, facepa, vertpa, i, edgehash, curdupface, v[0], v[1], v[2], v[3]);
            if(numlayer)
                remap_uvs_7_11_13_14(dm, splitdm, numlayer, i, curdupface, uv[0], uv[1], uv[2], uv[3]);
            break;
        case 19:
        case 21:
        case 22:
            remap_faces_19_21_22(dm, splitdm, mf, facepa, vertpa, i, edgehash, curdupface, v[0], v[1], v[2]);
            if(numlayer)
                remap_uvs_19_21_22(dm, splitdm, numlayer, i, curdupface, uv[0], uv[1], uv[2]);
            break;
        case 23:
            remap_faces_23(dm, splitdm, mf, facepa, vertpa, i, edgehash, curdupface, v[0], v[1], v[2]);
            if(numlayer)
                remap_uvs_23(dm, splitdm, numlayer, i, curdupface, uv[0], uv[1], uv[2]);
            break;
        case 0:
        case 16:
            df1 = get_dface(dm, splitdm, curdupface, i, mf);
            facepa[curdupface] = vertpa[mf->v1];

            if(df1->v4)
                df1->flag |= ME_FACE_SEL;
            else
                df1->flag &= ~ME_FACE_SEL;
            break;
        }

        curdupface += add_faces[*fs]+1;
    }

    for(i=0; i<curdupface; i++) {
        mf = CDDM_get_face(splitdm, i);
        test_index_face(mf, &splitdm->faceData, i, (mf->flag & ME_FACE_SEL ? 4 : 3));
    }

    BLI_edgehash_free(edgehash, NULL);
    MEM_freeN(facesplit);
    MEM_freeN(vertpa);

    return splitdm;

}
static DerivedMesh * explodeMesh(ExplodeModifierData *emd, 
        ParticleSystemModifierData *psmd, Scene *scene, Object *ob, 
  DerivedMesh *to_explode)
{
    DerivedMesh *explode, *dm=to_explode;
    MFace *mf= NULL, *mface;
    /* ParticleSettings *part=psmd->psys->part; */ /* UNUSED */
    ParticleSimulationData sim= {NULL};
    ParticleData *pa=NULL, *pars=psmd->psys->particles;
    ParticleKey state, birth;
    EdgeHash *vertpahash;
    EdgeHashIterator *ehi;
    float *vertco= NULL, imat[4][4];
    float rot[4];
    float cfra;
    /* float timestep; */
    int *facepa=emd->facepa;
    int totdup=0,totvert=0,totface=0,totpart=0;
    int i, v;
    unsigned int ed_v1, ed_v2, mindex=0;
    MTFace *mtface = NULL, *mtf;

    totface= dm->getNumFaces(dm);
    totvert= dm->getNumVerts(dm);
    mface= dm->getFaceArray(dm);
    totpart= psmd->psys->totpart;

    sim.scene= scene;
    sim.ob= ob;
    sim.psys= psmd->psys;
    sim.psmd= psmd;

    /* timestep= psys_get_timestep(&sim); */

    cfra= BKE_curframe(scene);

    /* hash table for vertice <-> particle relations */
    vertpahash= BLI_edgehash_new();

    for (i=0; i<totface; i++) {
        /* do mindex + totvert to ensure the vertex index to be the first
         * with BLI_edgehashIterator_getKey */
        if(facepa[i]==totpart || cfra < (pars+facepa[i])->time)
            mindex = totvert+totpart;
        else 
            mindex = totvert+facepa[i];

        mf= &mface[i];

        /* set face vertices to exist in particle group */
        BLI_edgehash_insert(vertpahash, mf->v1, mindex, NULL);
        BLI_edgehash_insert(vertpahash, mf->v2, mindex, NULL);
        BLI_edgehash_insert(vertpahash, mf->v3, mindex, NULL);
        if(mf->v4)
            BLI_edgehash_insert(vertpahash, mf->v4, mindex, NULL);
    }

    /* make new vertice indexes & count total vertices after duplication */
    ehi= BLI_edgehashIterator_new(vertpahash);
    for(; !BLI_edgehashIterator_isDone(ehi); BLI_edgehashIterator_step(ehi)) {
        BLI_edgehashIterator_setValue(ehi, SET_INT_IN_POINTER(totdup));
        totdup++;
    }
    BLI_edgehashIterator_free(ehi);

    /* the final duplicated vertices */
    explode= CDDM_from_template(dm, totdup, 0,totface);
    mtface = CustomData_get_layer_named(&explode->faceData, CD_MTFACE, emd->uvname);
    /*dupvert= CDDM_get_verts(explode);*/

    /* getting back to object space */
    invert_m4_m4(imat,ob->obmat);

    psmd->psys->lattice = psys_get_lattice(&sim);

    /* duplicate & displace vertices */
    ehi= BLI_edgehashIterator_new(vertpahash);
    for(; !BLI_edgehashIterator_isDone(ehi); BLI_edgehashIterator_step(ehi)) {
        MVert source;
        MVert *dest;

        /* get particle + vertex from hash */
        BLI_edgehashIterator_getKey(ehi, &ed_v1, &ed_v2);
        ed_v2 -= totvert;
        v= GET_INT_FROM_POINTER(BLI_edgehashIterator_getValue(ehi));

        dm->getVert(dm, ed_v1, &source);
        dest = CDDM_get_vert(explode,v);

        DM_copy_vert_data(dm, explode, ed_v1, v, 1);
        *dest = source;

        if(ed_v2 != totpart) {
            /* get particle */
            pa= pars + ed_v2;

            psys_get_birth_coordinates(&sim, pa, &birth, 0, 0);

            state.time=cfra;
            psys_get_particle_state(&sim, ed_v2, &state, 1);

            vertco=CDDM_get_vert(explode,v)->co;
            mul_m4_v3(ob->obmat,vertco);

            sub_v3_v3(vertco, birth.co);

            /* apply rotation, size & location */
            sub_qt_qtqt(rot, state.rot, birth.rot);
            mul_qt_v3(rot, vertco);

            if(emd->flag & eExplodeFlag_PaSize)
                mul_v3_fl(vertco,pa->size);

            add_v3_v3(vertco, state.co);

            mul_m4_v3(imat, vertco);
        }
    }
    BLI_edgehashIterator_free(ehi);

    /*map new vertices to faces*/
    for (i=0; i<totface; i++) {
        MFace source;
        int orig_v4;

        if(facepa[i]!=totpart)
        {
            pa=pars+facepa[i];

            if(pa->alive==PARS_UNBORN && (emd->flag&eExplodeFlag_Unborn)==0) continue;
            if(pa->alive==PARS_ALIVE && (emd->flag&eExplodeFlag_Alive)==0) continue;
            if(pa->alive==PARS_DEAD && (emd->flag&eExplodeFlag_Dead)==0) continue;
        }

        dm->getFace(dm,i,&source);
        mf=CDDM_get_face(explode,i);
        
        orig_v4 = source.v4;

        if(facepa[i]!=totpart && cfra < pa->time)
            mindex = totvert+totpart;
        else 
            mindex = totvert+facepa[i];

        source.v1 = edgecut_get(vertpahash, source.v1, mindex);
        source.v2 = edgecut_get(vertpahash, source.v2, mindex);
        source.v3 = edgecut_get(vertpahash, source.v3, mindex);
        if(source.v4)
            source.v4 = edgecut_get(vertpahash, source.v4, mindex);

        DM_copy_face_data(dm,explode,i,i,1);

        *mf = source;

        /* override uv channel for particle age */
        if(mtface) {
            float age = (cfra - pa->time)/pa->lifetime;
            /* Clamp to this range to avoid flipping to the other side of the coordinates. */
            CLAMP(age, 0.001f, 0.999f);

            mtf = mtface + i;

            mtf->uv[0][0] = mtf->uv[1][0] = mtf->uv[2][0] = mtf->uv[3][0] = age;
            mtf->uv[0][1] = mtf->uv[1][1] = mtf->uv[2][1] = mtf->uv[3][1] = 0.5f;
        }

        test_index_face(mf, &explode->faceData, i, (orig_v4 ? 4 : 3));
    }

    /* cleanup */
    BLI_edgehash_free(vertpahash, NULL);

    /* finalization */
    CDDM_calc_edges(explode);
    CDDM_calc_normals(explode);

    if(psmd->psys->lattice){
        end_latt_deform(psmd->psys->lattice);
        psmd->psys->lattice= NULL;
    }

    return explode;
}

static ParticleSystemModifierData * findPrecedingParticlesystem(Object *ob, ModifierData *emd)
{
    ModifierData *md;
    ParticleSystemModifierData *psmd= NULL;

    for (md=ob->modifiers.first; emd!=md; md=md->next){
        if(md->type==eModifierType_ParticleSystem)
            psmd= (ParticleSystemModifierData*) md;
    }
    return psmd;
}
static DerivedMesh * applyModifier(ModifierData *md, Object *ob,
                        DerivedMesh *derivedData,
                        int UNUSED(useRenderParams),
                        int UNUSED(isFinalCalc))
{
    DerivedMesh *dm = derivedData;
    ExplodeModifierData *emd= (ExplodeModifierData*) md;
    ParticleSystemModifierData *psmd=findPrecedingParticlesystem(ob,md);

    if(psmd){
        ParticleSystem * psys=psmd->psys;

        if(psys==NULL || psys->totpart==0) return derivedData;
        if(psys->part==NULL || psys->particles==NULL) return derivedData;
        if(psmd->dm==NULL) return derivedData;

        /* 1. find faces to be exploded if needed */
        if(emd->facepa == NULL
                 || psmd->flag&eParticleSystemFlag_Pars
                 || emd->flag&eExplodeFlag_CalcFaces
                 || MEM_allocN_len(emd->facepa)/sizeof(int) != dm->getNumFaces(dm))
        {
            if(psmd->flag & eParticleSystemFlag_Pars)
                psmd->flag &= ~eParticleSystemFlag_Pars;
            
            if(emd->flag & eExplodeFlag_CalcFaces)
                emd->flag &= ~eExplodeFlag_CalcFaces;

            createFacepa(emd,psmd,derivedData);
        }
        /* 2. create new mesh */
        if(emd->flag & eExplodeFlag_EdgeCut){
            int *facepa = emd->facepa;
            DerivedMesh *splitdm=cutEdges(emd,dm);
            DerivedMesh *explode=explodeMesh(emd, psmd, md->scene, ob, splitdm);

            MEM_freeN(emd->facepa);
            emd->facepa=facepa;
            splitdm->release(splitdm);
            return explode;
        }
        else
            return explodeMesh(emd, psmd, md->scene, ob, derivedData);
    }
    return derivedData;
}


ModifierTypeInfo modifierType_Explode = {
    /* name */              "Explode",
    /* structName */        "ExplodeModifierData",
    /* structSize */        sizeof(ExplodeModifierData),
    /* type */              eModifierTypeType_Constructive,
    /* flags */             eModifierTypeFlag_AcceptsMesh,
    /* copyData */          copyData,
    /* deformVerts */       NULL,
    /* deformMatrices */    NULL,
    /* deformVertsEM */     NULL,
    /* deformMatricesEM */  NULL,
    /* applyModifier */     applyModifier,
    /* applyModifierEM */   NULL,
    /* initData */          initData,
    /* requiredDataMask */  requiredDataMask,
    /* freeData */          freeData,
    /* isDisabled */        NULL,
    /* updateDepgraph */    NULL,
    /* dependsOnTime */     dependsOnTime,
    /* dependsOnNormals */  NULL,
    /* foreachObjectLink */ NULL,
    /* foreachIDLink */     NULL,
    /* foreachTexLink */    NULL,
};