meshtools.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) 2004 by Blender Foundation
 * All rights reserved.
 *
 * The Original Code is: all of this file.
 *
 * Contributor(s): none yet.
 *
 * ***** END GPL LICENSE BLOCK *****
 */

/*
    meshtools.c: no editmode (violated already :), tools operating on meshes
*/

#include <stddef.h>
#include <stdlib.h>
#include <math.h>
#include <float.h>

#include "MEM_guardedalloc.h"

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

#include "BLI_math.h"
#include "BLI_blenlib.h"
#include "BLI_utildefines.h"
#include "BLI_editVert.h"
#include "BLI_ghash.h"
#include "BLI_rand.h" /* for randome face sorting */
#include "BLI_threads.h"


#include "BKE_context.h"
#include "BKE_depsgraph.h"
#include "BKE_deform.h"
#include "BKE_DerivedMesh.h"
#include "BKE_key.h"
#include "BKE_library.h"
#include "BKE_main.h"
#include "BKE_mesh.h"
#include "BKE_material.h"
#include "BKE_report.h"
#include "BKE_multires.h"

#include "BLO_sys_types.h" // for intptr_t support

#include "ED_mesh.h"
#include "ED_object.h"
#include "ED_view3d.h"

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

/* own include */
#include "mesh_intern.h"


/* * ********************** no editmode!!! *********** */

/*********************** JOIN ***************************/

/* join selected meshes into the active mesh, context sensitive
return 0 if no join is made (error) and 1 of the join is done */

int join_mesh_exec(bContext *C, wmOperator *op)
{
    Main *bmain= CTX_data_main(C);
    Scene *scene= CTX_data_scene(C);
    Object *ob= CTX_data_active_object(C);
    Material **matar, *ma;
    Mesh *me;
    MVert *mvert, *mv;
    MEdge *medge = NULL;
    MFace *mface = NULL;
    Key *key, *nkey=NULL;
    KeyBlock *kb, *okb, *kbn;
    float imat[4][4], cmat[4][4], *fp1, *fp2, curpos;
    int a, b, totcol, totmat=0, totedge=0, totvert=0, totface=0, ok=0;
    int vertofs, *matmap=NULL;
    int i, j, index, haskey=0, edgeofs, faceofs;
    bDeformGroup *dg, *odg;
    MDeformVert *dvert;
    CustomData vdata, edata, fdata;

    if(scene->obedit) {
        BKE_report(op->reports, RPT_WARNING, "Cant join while in editmode");
        return OPERATOR_CANCELLED;
    }
    
    /* ob is the object we are adding geometry to */
    if(!ob || ob->type!=OB_MESH) {
        BKE_report(op->reports, RPT_WARNING, "Active object is not a mesh");
        return OPERATOR_CANCELLED;
    }
    
    /* count & check */
    CTX_DATA_BEGIN(C, Base*, base, selected_editable_bases) {
        if(base->object->type==OB_MESH) {
            me= base->object->data;
            
            totvert+= me->totvert;
            totedge+= me->totedge;
            totface+= me->totface;
            totmat+= base->object->totcol;
            
            if(base->object == ob)
                ok= 1;
            
            /* check for shapekeys */
            if(me->key)
                haskey++;
        }
    }
    CTX_DATA_END;
    
    /* that way the active object is always selected */ 
    if(ok==0) {
        BKE_report(op->reports, RPT_WARNING, "Active object is not a selected mesh");
        return OPERATOR_CANCELLED;
    }
    
    /* only join meshes if there are verts to join, there aren't too many, and we only had one mesh selected */
    me= (Mesh *)ob->data;
    key= me->key;

    if(totvert==0 || totvert==me->totvert) {
        BKE_report(op->reports, RPT_WARNING, "No mesh data to join");
        return OPERATOR_CANCELLED;
    }
    
    if(totvert > MESH_MAX_VERTS) {
        BKE_reportf(op->reports, RPT_WARNING, "Joining results in %d vertices, limit is " STRINGIFY(MESH_MAX_VERTS), totvert);
        return OPERATOR_CANCELLED;      
    }

    /* new material indices and material array */
    matar= MEM_callocN(sizeof(void*)*totmat, "join_mesh matar");
    if (totmat) matmap= MEM_callocN(sizeof(int)*totmat, "join_mesh matmap");
    totcol= ob->totcol;
    
    /* obact materials in new main array, is nicer start! */
    for(a=0; a<ob->totcol; a++) {
        matar[a]= give_current_material(ob, a+1);
        id_us_plus((ID *)matar[a]);
        /* increase id->us : will be lowered later */
    }
    
    /* - if destination mesh had shapekeys, move them somewhere safe, and set up placeholders
     *  with arrays that are large enough to hold shapekey data for all meshes
     * -    if destination mesh didn't have shapekeys, but we encountered some in the meshes we're 
     *  joining, set up a new keyblock and assign to the mesh
     */
    if(key) {
        /* make a duplicate copy that will only be used here... (must remember to free it!) */
        nkey= copy_key(key);
        
        /* for all keys in old block, clear data-arrays */
        for(kb= key->block.first; kb; kb= kb->next) {
            if(kb->data) MEM_freeN(kb->data);
            kb->data= MEM_callocN(sizeof(float)*3*totvert, "join_shapekey");
            kb->totelem= totvert;
            kb->weights= NULL;
        }
    }
    else if(haskey) {
        /* add a new key-block and add to the mesh */
        key= me->key= add_key((ID *)me);
        key->type = KEY_RELATIVE;
    }
    
    /* first pass over objects - copying materials and vertexgroups across */
    CTX_DATA_BEGIN(C, Base*, base, selected_editable_bases) {
        /* only act if a mesh, and not the one we're joining to */
        if((ob!=base->object) && (base->object->type==OB_MESH)) {
            me= base->object->data;
            
            /* Join this object's vertex groups to the base one's */
            for(dg=base->object->defbase.first; dg; dg=dg->next) {
                /* See if this group exists in the object (if it doesn't, add it to the end) */
                if(!defgroup_find_name(ob, dg->name)) {
                    odg = MEM_callocN(sizeof(bDeformGroup), "join deformGroup");
                    memcpy(odg, dg, sizeof(bDeformGroup));
                    BLI_addtail(&ob->defbase, odg);
                }
            }
            if(ob->defbase.first && ob->actdef==0)
                ob->actdef=1;
            
            
            if(me->totvert) {
                /* Add this object's materials to the base one's if they don't exist already (but only if limits not exceeded yet) */
                if(totcol < MAXMAT) {
                    for(a=1; a<=base->object->totcol; a++) {
                        ma= give_current_material(base->object, a);

                        for(b=0; b<totcol; b++) {
                            if(ma == matar[b]) break;
                        }
                        if(b==totcol) {
                            matar[b]= ma;
                            if(ma) {
                                id_us_plus(&ma->id);
                            }
                            totcol++;
                        }
                        if(totcol >= MAXMAT)
                            break;
                    }
                }
                
                /* if this mesh has shapekeys, check if destination mesh already has matching entries too */
                if(me->key && key) {
                    for(kb= me->key->block.first; kb; kb= kb->next) {
                        /* if key doesn't exist in destination mesh, add it */
                        if(key_get_named_keyblock(key, kb->name) == NULL) {
                            /* copy this existing one over to the new shapekey block */
                            kbn= MEM_dupallocN(kb);
                            kbn->prev= kbn->next= NULL;
                            
                            /* adjust adrcode and other settings to fit (allocate a new data-array) */
                            kbn->data= MEM_callocN(sizeof(float)*3*totvert, "joined_shapekey");
                            kbn->totelem= totvert;
                            kbn->weights= NULL;
                            
                            okb= key->block.last;
                            curpos= (okb) ? okb->pos : -0.1f;
                            if(key->type == KEY_RELATIVE)
                                kbn->pos= curpos + 0.1f;
                            else
                                kbn->pos= curpos;
                            
                            BLI_addtail(&key->block, kbn);
                            kbn->adrcode= key->totkey;
                            key->totkey++;
                            if(key->totkey==1) key->refkey= kbn;
                            
                            // XXX 2.5 Animato
#if 0
                            /* also, copy corresponding ipo-curve to ipo-block if applicable */
                            if(me->key->ipo && key->ipo) {
                                // FIXME... this is a luxury item!
                                puts("FIXME: ignoring IPO's when joining shapekeys on Meshes for now...");
                            }
#endif
                        }
                    }
                }
            }
        }
    }
    CTX_DATA_END;
    
    /* setup new data for destination mesh */
    memset(&vdata, 0, sizeof(vdata));
    memset(&edata, 0, sizeof(edata));
    memset(&fdata, 0, sizeof(fdata));
    
    mvert= CustomData_add_layer(&vdata, CD_MVERT, CD_CALLOC, NULL, totvert);
    medge= CustomData_add_layer(&edata, CD_MEDGE, CD_CALLOC, NULL, totedge);
    mface= CustomData_add_layer(&fdata, CD_MFACE, CD_CALLOC, NULL, totface);

    vertofs= 0;
    edgeofs= 0;
    faceofs= 0;
    
    /* inverse transform for all selected meshes in this object */
    invert_m4_m4(imat, ob->obmat);
    
    CTX_DATA_BEGIN(C, Base*, base, selected_editable_bases) {
        /* only join if this is a mesh */
        if(base->object->type==OB_MESH) {
            me= base->object->data;
            
            if(me->totvert) {
                /* standard data */
                CustomData_merge(&me->vdata, &vdata, CD_MASK_MESH, CD_DEFAULT, totvert);
                CustomData_copy_data(&me->vdata, &vdata, 0, vertofs, me->totvert);
                
                /* vertex groups */
                dvert= CustomData_get(&vdata, vertofs, CD_MDEFORMVERT);
                
                /* NB: vertex groups here are new version */
                if(dvert) {
                    for(i=0; i<me->totvert; i++) {
                        for(j=0; j<dvert[i].totweight; j++) {
                            /*  Find the old vertex group */
                            odg = BLI_findlink(&base->object->defbase, dvert[i].dw[j].def_nr);
                            if(odg) {
                                /*  Search for a match in the new object, and set new index */
                                for(dg=ob->defbase.first, index=0; dg; dg=dg->next, index++) {
                                    if(!strcmp(dg->name, odg->name)) {
                                        dvert[i].dw[j].def_nr = index;
                                        break;
                                    }
                                }
                            }
                        }
                    }
                }
                
                /* if this is the object we're merging into, no need to do anything */
                if(base->object != ob) {
                    /* watch this: switch matmul order really goes wrong */
                    mult_m4_m4m4(cmat, imat, base->object->obmat);
                    
                    /* transform vertex coordinates into new space */
                    for(a=0, mv=mvert; a < me->totvert; a++, mv++) {
                        mul_m4_v3(cmat, mv->co);
                    }
                    
                    /* for each shapekey in destination mesh:
                     *  - if there's a matching one, copy it across (will need to transform vertices into new space...)
                     *  - otherwise, just copy own coordinates of mesh (no need to transform vertex coordinates into new space)
                     */
                    if(key) {
                        /* if this mesh has any shapekeys, check first, otherwise just copy coordinates */
                        for(kb= key->block.first; kb; kb= kb->next) {
                            /* get pointer to where to write data for this mesh in shapekey's data array */
                            fp1= ((float *)kb->data) + (vertofs*3); 
                            
                            /* check if this mesh has such a shapekey */
                            okb= key_get_named_keyblock(me->key, kb->name);
                            if(okb) {
                                /* copy this mesh's shapekey to the destination shapekey (need to transform first) */
                                fp2= ((float *)(okb->data));
                                for(a=0; a < me->totvert; a++, fp1+=3, fp2+=3) {
                                    VECCOPY(fp1, fp2);
                                    mul_m4_v3(cmat, fp1);
                                }
                            }
                            else {
                                /* copy this mesh's vertex coordinates to the destination shapekey */
                                mv= mvert;
                                for(a=0; a < me->totvert; a++, fp1+=3, mv++) {
                                    VECCOPY(fp1, mv->co);
                                }
                            }
                        }
                    }
                }
                else {
                    /* for each shapekey in destination mesh:
                     *  - if it was an 'original', copy the appropriate data from nkey
                     *  - otherwise, copy across plain coordinates (no need to transform coordinates)
                     */
                    if(key) {
                        for(kb= key->block.first; kb; kb= kb->next) {
                            /* get pointer to where to write data for this mesh in shapekey's data array */
                            fp1= ((float *)kb->data) + (vertofs*3); 
                            
                            /* check if this was one of the original shapekeys */
                            okb= key_get_named_keyblock(nkey, kb->name);
                            if(okb) {
                                /* copy this mesh's shapekey to the destination shapekey */
                                fp2= ((float *)(okb->data));
                                for(a=0; a < me->totvert; a++, fp1+=3, fp2+=3) {
                                    VECCOPY(fp1, fp2);
                                }
                            }
                            else {
                                /* copy base-coordinates to the destination shapekey */
                                mv= mvert;
                                for(a=0; a < me->totvert; a++, fp1+=3, mv++) {
                                    VECCOPY(fp1, mv->co);
                                }
                            }
                        }
                    }
                }
                
                /* advance mvert pointer to end of base mesh's data */
                mvert+= me->totvert;
            }
            
            if(me->totface) {
                /* make mapping for materials */
                for(a=1; a<=base->object->totcol; a++) {
                    ma= give_current_material(base->object, a);

                    for(b=0; b<totcol; b++) {
                        if(ma == matar[b]) {
                            matmap[a-1]= b;
                            break;
                        }
                    }
                }
                
                if(base->object!=ob)
                    multiresModifier_prepare_join(scene, base->object, ob);

                CustomData_merge(&me->fdata, &fdata, CD_MASK_MESH, CD_DEFAULT, totface);
                CustomData_copy_data(&me->fdata, &fdata, 0, faceofs, me->totface);
                
                for(a=0; a<me->totface; a++, mface++) {
                    mface->v1+= vertofs;
                    mface->v2+= vertofs;
                    mface->v3+= vertofs;
                    if(mface->v4) mface->v4+= vertofs;
                    
                    if (matmap)
                        mface->mat_nr= matmap[(int)mface->mat_nr];
                    else 
                        mface->mat_nr= 0;
                }
                
                faceofs += me->totface;
            }
            
            if(me->totedge) {
                CustomData_merge(&me->edata, &edata, CD_MASK_MESH, CD_DEFAULT, totedge);
                CustomData_copy_data(&me->edata, &edata, 0, edgeofs, me->totedge);
                
                for(a=0; a<me->totedge; a++, medge++) {
                    medge->v1+= vertofs;
                    medge->v2+= vertofs;
                }
                
                edgeofs += me->totedge;
            }
            
            /* vertofs is used to help newly added verts be reattached to their edge/face 
             * (cannot be set earlier, or else reattaching goes wrong)
             */
            vertofs += me->totvert;
            
            /* free base, now that data is merged */
            if(base->object != ob)
                ED_base_object_free_and_unlink(bmain, scene, base);
        }
    }
    CTX_DATA_END;
    
    /* return to mesh we're merging to */
    me= ob->data;
    
    CustomData_free(&me->vdata, me->totvert);
    CustomData_free(&me->edata, me->totedge);
    CustomData_free(&me->fdata, me->totface);

    me->totvert= totvert;
    me->totedge= totedge;
    me->totface= totface;
    
    me->vdata= vdata;
    me->edata= edata;
    me->fdata= fdata;

    mesh_update_customdata_pointers(me);
    
    /* old material array */
    for(a=1; a<=ob->totcol; a++) {
        ma= ob->mat[a-1];
        if(ma) ma->id.us--;
    }
    for(a=1; a<=me->totcol; a++) {
        ma= me->mat[a-1];
        if(ma) ma->id.us--;
    }
    if(ob->mat) MEM_freeN(ob->mat);
    if(ob->matbits) MEM_freeN(ob->matbits);
    if(me->mat) MEM_freeN(me->mat);
    ob->mat= me->mat= NULL;
    ob->matbits= NULL;
    
    if(totcol) {
        me->mat= matar;
        ob->mat= MEM_callocN(sizeof(void *)*totcol, "join obmatar");
        ob->matbits= MEM_callocN(sizeof(char)*totcol, "join obmatbits");
    }
    else
        MEM_freeN(matar);
    
    ob->totcol= me->totcol= totcol;

    if (matmap) MEM_freeN(matmap);
    
    /* other mesh users */
    test_object_materials((ID *)me);
    
    /* free temp copy of destination shapekeys (if applicable) */
    if(nkey) {
        // XXX 2.5 Animato
#if 0
        /* free it's ipo too - both are not actually freed from memory yet as ID-blocks */
        if(nkey->ipo) {
            free_ipo(nkey->ipo);
            BLI_remlink(&bmain->ipo, nkey->ipo);
            MEM_freeN(nkey->ipo);
        }
#endif
        
        free_key(nkey);
        BLI_remlink(&bmain->key, nkey);
        MEM_freeN(nkey);
    }
    
    DAG_scene_sort(bmain, scene);   // removed objects, need to rebuild dag before editmode call

#if 0
    ED_object_enter_editmode(C, EM_WAITCURSOR);
    ED_object_exit_editmode(C, EM_FREEDATA|EM_WAITCURSOR|EM_DO_UNDO);
#else
    /* toggle editmode using lower level functions so this can be called from python */
    make_editMesh(scene, ob);
    load_editMesh(scene, ob);
    free_editMesh(me->edit_mesh);
    MEM_freeN(me->edit_mesh);
    me->edit_mesh= NULL;
    DAG_id_tag_update(&ob->id, OB_RECALC_OB|OB_RECALC_DATA);
#endif
    WM_event_add_notifier(C, NC_SCENE|ND_OB_ACTIVE, scene);

    return OPERATOR_FINISHED;
}

/*********************** JOIN AS SHAPES ***************************/

/* Append selected meshes vertex locations as shapes of the active mesh, 
  return 0 if no join is made (error) and 1 of the join is done */

int join_mesh_shapes_exec(bContext *C, wmOperator *op)
{
    Scene *scene= CTX_data_scene(C);
    Object *ob= CTX_data_active_object(C);
    Mesh *me= (Mesh *)ob->data;
    Mesh *selme=NULL;
    DerivedMesh *dm=NULL;
    Key *key=me->key;
    KeyBlock *kb;
    int ok=0, nonequal_verts=0;
    
    CTX_DATA_BEGIN(C, Base*, base, selected_editable_bases) {
        if (base->object == ob) continue;
        
        if (base->object->type==OB_MESH) {
            selme = (Mesh *)base->object->data;
            
            if (selme->totvert==me->totvert)
                ok++;
            else
                nonequal_verts=1;
        }
    }
    CTX_DATA_END;
    
    if (!ok) {
        if (nonequal_verts)
            BKE_report(op->reports, RPT_WARNING, "Selected meshes must have equal numbers of vertices");
        else
            BKE_report(op->reports, RPT_WARNING, "No additional selected meshes with equal vertex count to join");
        return OPERATOR_CANCELLED;
    }
    
    if(key == NULL) {
        key= me->key= add_key((ID *)me);
        key->type= KEY_RELATIVE;

        /* first key added, so it was the basis. initialise it with the existing mesh */
        kb= add_keyblock(key, NULL);
        mesh_to_key(me, kb);
    }
    
    /* now ready to add new keys from selected meshes */
    CTX_DATA_BEGIN(C, Base*, base, selected_editable_bases) {
        if (base->object == ob) continue;
        
        if(base->object->type==OB_MESH) {
            selme = (Mesh *)base->object->data;
            
            if (selme->totvert==me->totvert) {
                dm = mesh_get_derived_deform(scene, base->object, CD_MASK_BAREMESH);
                
                if (!dm) continue;
                    
                kb= add_keyblock(key, base->object->id.name+2);
                
                DM_to_meshkey(dm, me, kb);
                
                dm->release(dm);
            }
        }
    }
    CTX_DATA_END;
    
    WM_event_add_notifier(C, NC_SCENE|ND_OB_ACTIVE, scene);
    
    return OPERATOR_FINISHED;
}

/* ********************* MESH VERTEX OCTREE LOOKUP ************* */

/* important note; this is unfinished, needs better API for editmode, and custom threshold */

#define MOC_RES         8
#define MOC_NODE_RES    8
#define MOC_THRESH      0.00002f

typedef struct MocNode {
    struct MocNode *next;
    intptr_t index[MOC_NODE_RES];
} MocNode;

static int mesh_octree_get_base_offs(float *co, float *offs, float *div)
{
    int vx, vy, vz;
    
    vx= floor( (co[0]-offs[0])/div[0] );
    vy= floor( (co[1]-offs[1])/div[1] );
    vz= floor( (co[2]-offs[2])/div[2] );
    
    CLAMP(vx, 0, MOC_RES-1);
    CLAMP(vy, 0, MOC_RES-1);
    CLAMP(vz, 0, MOC_RES-1);

    return (vx*MOC_RES*MOC_RES) + vy*MOC_RES + vz;
}

static void mesh_octree_add_node(MocNode **bt, intptr_t index)
{
    if(*bt==NULL) {
        *bt= MEM_callocN(sizeof(MocNode), "MocNode");
        (*bt)->index[0]= index;
    }
    else {
        int a;
        for(a=0; a<MOC_NODE_RES; a++) {
            if((*bt)->index[a]==index)
                return;
            else if((*bt)->index[a]==0) {
                (*bt)->index[a]= index;
                return;
            }
        }
        mesh_octree_add_node(&(*bt)->next, index);
    }
}

static void mesh_octree_free_node(MocNode **bt)
{
    if( (*bt)->next ) {
        mesh_octree_free_node(&(*bt)->next);
    }
    MEM_freeN(*bt);
}


/* temporal define, just to make nicer code below */
#define MOC_INDEX(vx, vy, vz)  (((vx)*MOC_RES*MOC_RES) + (vy)*MOC_RES + (vz))

static void mesh_octree_add_nodes(MocNode **basetable, float *co, float *offs, float *div, intptr_t index)
{
    float fx, fy, fz;
    int vx, vy, vz;
    
    if ( !finite(co[0]) ||
         !finite(co[1]) ||
         !finite(co[2]))
    {
        return;
    }
    
    fx= (co[0]-offs[0])/div[0];
    fy= (co[1]-offs[1])/div[1];
    fz= (co[2]-offs[2])/div[2];
    CLAMP(fx, 0.0f, MOC_RES-MOC_THRESH);
    CLAMP(fy, 0.0f, MOC_RES-MOC_THRESH);
    CLAMP(fz, 0.0f, MOC_RES-MOC_THRESH);
    
    vx= (int)floorf(fx);
    vy= (int)floorf(fy);
    vz= (int)floorf(fz);

    mesh_octree_add_node(basetable + MOC_INDEX(vx, vy, vz), index);

    if (vx > 0)
        if (fx-((float)vx)-MOC_THRESH < 0.0f)
            mesh_octree_add_node(basetable + MOC_INDEX(vx - 1, vy, vz), index);
    if (vx < MOC_RES - 2)
        if (fx-((float)vx)+MOC_THRESH > 1.0f)
            mesh_octree_add_node(basetable + MOC_INDEX(vx + 1, vy, vz), index);

    if (vy > 0)
        if (fy-((float)vy)-MOC_THRESH < 0.0f)
            mesh_octree_add_node(basetable + MOC_INDEX(vx, vy - 1, vz), index);
    if (vy < MOC_RES - 2)
        if (fy-((float)vy)+MOC_THRESH > 1.0f)
            mesh_octree_add_node(basetable + MOC_INDEX(vx, vy + 1, vz), index);

    if (vz > 0)
        if (fz-((float)vz)-MOC_THRESH < 0.0f)
            mesh_octree_add_node(basetable + MOC_INDEX(vx, vy, vz - 1), index);
    if (vz <MOC_RES - 2)
        if (fz-((float)vz)+MOC_THRESH > 1.0f)
            mesh_octree_add_node(basetable + MOC_INDEX(vx, vy, vz + 1), index);

}

static intptr_t mesh_octree_find_index(MocNode **bt, MVert *mvert, float *co)
{
    float *vec;
    int a;
    
    if(*bt==NULL)
        return -1;
    
    for(a=0; a<MOC_NODE_RES; a++) {
        if((*bt)->index[a]) {
            /* does mesh verts and editmode, code looks potential dangerous, octree should really be filled OK! */
            if(mvert) {
                vec= (mvert+(*bt)->index[a]-1)->co;
                if(compare_v3v3(vec, co, MOC_THRESH))
                    return (*bt)->index[a]-1;
            }
            else {
                EditVert *eve= (EditVert *)((*bt)->index[a]);
                if(compare_v3v3(eve->co, co, MOC_THRESH))
                    return (*bt)->index[a];
            }
        }
        else return -1;
    }
    if( (*bt)->next)
        return mesh_octree_find_index(&(*bt)->next, mvert, co);
    
    return -1;
}

static struct {
    MocNode **table;
    float offs[3], div[3];
} MeshOctree = {NULL, {0, 0, 0}, {0, 0, 0}};

/* mode is 's' start, or 'e' end, or 'u' use */
/* if end, ob can be NULL */
intptr_t mesh_octree_table(Object *ob, EditMesh *em, float *co, char mode)
{
    MocNode **bt;
    
    if(mode=='u') {     /* use table */
        if(MeshOctree.table==NULL)
            mesh_octree_table(ob, em, NULL, 's');

        if(MeshOctree.table) {
            Mesh *me= ob->data;
            bt= MeshOctree.table + mesh_octree_get_base_offs(co, MeshOctree.offs, MeshOctree.div);
            if(em)
                return mesh_octree_find_index(bt, NULL, co);
            else
                return mesh_octree_find_index(bt, me->mvert, co);
        }
        return -1;
    }
    else if(mode=='s') {    /* start table */
        Mesh *me= ob->data;
        float min[3], max[3];

        /* we compute own bounding box and don't reuse ob->bb because
         * we are using the undeformed coordinates*/
        INIT_MINMAX(min, max);

        if(em && me->edit_mesh==em) {
            EditVert *eve;
            
            for(eve= em->verts.first; eve; eve= eve->next)
                DO_MINMAX(eve->co, min, max)
        }
        else {      
            MVert *mvert;
            int a;
            
            for(a=0, mvert= me->mvert; a<me->totvert; a++, mvert++)
                DO_MINMAX(mvert->co, min, max);
        }
        
        /* for quick unit coordinate calculus */
        VECCOPY(MeshOctree.offs, min);
        MeshOctree.offs[0]-= MOC_THRESH;        /* we offset it 1 threshold unit extra */
        MeshOctree.offs[1]-= MOC_THRESH;
        MeshOctree.offs[2]-= MOC_THRESH;
        
        sub_v3_v3v3(MeshOctree.div, max, min);
        MeshOctree.div[0]+= 2*MOC_THRESH;   /* and divide with 2 threshold unit more extra (try 8x8 unit grid on paint) */
        MeshOctree.div[1]+= 2*MOC_THRESH;
        MeshOctree.div[2]+= 2*MOC_THRESH;
        
        mul_v3_fl(MeshOctree.div, 1.0f/MOC_RES);
        if(MeshOctree.div[0]==0.0f) MeshOctree.div[0]= 1.0f;
        if(MeshOctree.div[1]==0.0f) MeshOctree.div[1]= 1.0f;
        if(MeshOctree.div[2]==0.0f) MeshOctree.div[2]= 1.0f;
            
        if(MeshOctree.table) /* happens when entering this call without ending it */
            mesh_octree_table(ob, em, co, 'e');
        
        MeshOctree.table= MEM_callocN(MOC_RES*MOC_RES*MOC_RES*sizeof(void *), "sym table");
        
        if(em && me->edit_mesh==em) {
            EditVert *eve;

            for(eve= em->verts.first; eve; eve= eve->next) {
                mesh_octree_add_nodes(MeshOctree.table, eve->co, MeshOctree.offs, MeshOctree.div, (intptr_t)(eve));
            }
        }
        else {      
            MVert *mvert;
            int a;
            
            for(a=0, mvert= me->mvert; a<me->totvert; a++, mvert++)
                mesh_octree_add_nodes(MeshOctree.table, mvert->co, MeshOctree.offs, MeshOctree.div, a+1);
        }
    }
    else if(mode=='e') { /* end table */
        if(MeshOctree.table) {
            int a;
            
            for(a=0, bt=MeshOctree.table; a<MOC_RES*MOC_RES*MOC_RES; a++, bt++) {
                if(*bt) mesh_octree_free_node(bt);
            }
            MEM_freeN(MeshOctree.table);
            MeshOctree.table= NULL;
        }
    }
    return 0;
}

MirrTopoStore_t mesh_topo_store= {NULL, -1. -1, -1};

/* mode is 's' start, or 'e' end, or 'u' use */
/* if end, ob can be NULL */
/* note, is supposed return -1 on error, which callers are currently checking for, but is not used so far */
int mesh_mirrtopo_table(Object *ob, char mode)
{
    if(mode=='u') {     /* use table */
        if (ED_mesh_mirrtopo_recalc_check(ob->data, ob->mode, &mesh_topo_store)) {
            mesh_mirrtopo_table(ob, 's');
        }
    }
    else if(mode=='s') { /* start table */
        ED_mesh_mirrtopo_init(ob->data, ob->mode, &mesh_topo_store, FALSE);
    }
    else if(mode=='e') { /* end table */
        ED_mesh_mirrtopo_free(&mesh_topo_store);
    }
    return 0;
}

static int mesh_get_x_mirror_vert_spacial(Object *ob, int index)
{
    Mesh *me= ob->data;
    MVert *mvert;
    float vec[3];
    
    mvert= me->mvert+index;
    vec[0]= -mvert->co[0];
    vec[1]= mvert->co[1];
    vec[2]= mvert->co[2];
    
    return mesh_octree_table(ob, NULL, vec, 'u');
}

static int mesh_get_x_mirror_vert_topo(Object *ob, int index)
{
    if (mesh_mirrtopo_table(ob, 'u')==-1)
        return -1;

    return mesh_topo_store.index_lookup[index];
}

int mesh_get_x_mirror_vert(Object *ob, int index)
{
    if (((Mesh *)ob->data)->editflag & ME_EDIT_MIRROR_TOPO) {
        return mesh_get_x_mirror_vert_topo(ob, index);
    } else {
        return mesh_get_x_mirror_vert_spacial(ob, index);
    }
}

static EditVert *editmesh_get_x_mirror_vert_spacial(Object *ob, EditMesh *em, float *co)
{
    float vec[3];
    intptr_t poinval;
    
    /* ignore nan verts */
    if (!finite(co[0]) ||
        !finite(co[1]) ||
        !finite(co[2])
       )
        return NULL;
    
    vec[0]= -co[0];
    vec[1]= co[1];
    vec[2]= co[2];
    
    poinval= mesh_octree_table(ob, em, vec, 'u');
    if(poinval != -1)
        return (EditVert *)(poinval);
    return NULL;
}

static EditVert *editmesh_get_x_mirror_vert_topo(Object *ob, struct EditMesh *em, EditVert *eve, int index)
{
    intptr_t poinval;
    if (mesh_mirrtopo_table(ob, 'u')==-1)
        return NULL;

    if (index == -1) {
        index = BLI_findindex(&em->verts, eve);

        if (index == -1) {
            return NULL;
        }
    }

    poinval= mesh_topo_store.index_lookup[index];

    if(poinval != -1)
        return (EditVert *)(poinval);
    return NULL;
}   

EditVert *editmesh_get_x_mirror_vert(Object *ob, struct EditMesh *em, EditVert *eve, float *co, int index)
{
    if (((Mesh *)ob->data)->editflag & ME_EDIT_MIRROR_TOPO) {
        return editmesh_get_x_mirror_vert_topo(ob, em, eve, index);
    } else {
        return editmesh_get_x_mirror_vert_spacial(ob, em, co);
    }
}


#if 0
float *editmesh_get_mirror_uv(int axis, float *uv, float *mirrCent, float *face_cent)
{
    float vec[2];
    float cent_vec[2];
    float cent[2];

    /* ignore nan verts */
    if (isnan(uv[0]) || !finite(uv[0]) ||
        isnan(uv[1]) || !finite(uv[1])
       )
        return NULL;

    if (axis) {
        vec[0]= uv[0];
        vec[1]= -((uv[1])-mirrCent[1]) + mirrCent[1];

        cent_vec[0] = face_cent[0];
        cent_vec[1]= -((face_cent[1])-mirrCent[1]) + mirrCent[1];
    } else {
        vec[0]= -((uv[0])-mirrCent[0]) + mirrCent[0];
        vec[1]= uv[1];

        cent_vec[0]= -((face_cent[0])-mirrCent[0]) + mirrCent[0];
        cent_vec[1] = face_cent[1];
    }

    /* TODO - Optimize */
    {
        EditFace *efa;
        int i, len;
        for(efa=em->faces.first; efa; efa=efa->next) {
            MTFace *tf= (MTFace *)CustomData_em_get(&em->fdata, efa->data, CD_MTFACE);
            uv_center(tf->uv, cent, (void *)efa->v4);

            if ( (fabs(cent[0] - cent_vec[0]) < 0.001) && (fabs(cent[1] - cent_vec[1]) < 0.001) ) {
                len = efa->v4 ? 4 : 3;
                for (i=0; i<len; i++) {
                    if ( (fabs(tf->uv[i][0] - vec[0]) < 0.001) && (fabs(tf->uv[i][1] - vec[1]) < 0.001) ) {
                        return tf->uv[i];
                    }
                }
            }
        }
    }

    return NULL;
}
#endif

static unsigned int mirror_facehash(const void *ptr)
{
    const MFace *mf= ptr;
    int v0, v1;

    if(mf->v4) {
        v0= MIN4(mf->v1, mf->v2, mf->v3, mf->v4);
        v1= MAX4(mf->v1, mf->v2, mf->v3, mf->v4);
    }
    else {
        v0= MIN3(mf->v1, mf->v2, mf->v3);
        v1= MAX3(mf->v1, mf->v2, mf->v3);
    }

    return ((v0*39)^(v1*31));
}

static int mirror_facerotation(MFace *a, MFace *b)
{
    if(b->v4) {
        if(a->v1==b->v1 && a->v2==b->v2 && a->v3==b->v3 && a->v4==b->v4)
            return 0;
        else if(a->v4==b->v1 && a->v1==b->v2 && a->v2==b->v3 && a->v3==b->v4)
            return 1;
        else if(a->v3==b->v1 && a->v4==b->v2 && a->v1==b->v3 && a->v2==b->v4)
            return 2;
        else if(a->v2==b->v1 && a->v3==b->v2 && a->v4==b->v3 && a->v1==b->v4)
            return 3;
    }
    else {
        if(a->v1==b->v1 && a->v2==b->v2 && a->v3==b->v3)
            return 0;
        else if(a->v3==b->v1 && a->v1==b->v2 && a->v2==b->v3)
            return 1;
        else if(a->v2==b->v1 && a->v3==b->v2 && a->v1==b->v3)
            return 2;
    }
    
    return -1;
}

static int mirror_facecmp(const void *a, const void *b)
{
    return (mirror_facerotation((MFace*)a, (MFace*)b) == -1);
}

int *mesh_get_x_mirror_faces(Object *ob, EditMesh *em)
{
    Mesh *me= ob->data;
    MVert *mv, *mvert= me->mvert;
    MFace mirrormf, *mf, *hashmf, *mface= me->mface;
    GHash *fhash;
    int *mirrorverts, *mirrorfaces;
    int a;

    mirrorverts= MEM_callocN(sizeof(int)*me->totvert, "MirrorVerts");
    mirrorfaces= MEM_callocN(sizeof(int)*2*me->totface, "MirrorFaces");

    mesh_octree_table(ob, em, NULL, 's');

    for(a=0, mv=mvert; a<me->totvert; a++, mv++)
        mirrorverts[a]= mesh_get_x_mirror_vert(ob, a);

    mesh_octree_table(ob, em, NULL, 'e');

    fhash= BLI_ghash_new(mirror_facehash, mirror_facecmp, "mirror_facehash gh");
    for(a=0, mf=mface; a<me->totface; a++, mf++)
        BLI_ghash_insert(fhash, mf, mf);

    for(a=0, mf=mface; a<me->totface; a++, mf++) {
        mirrormf.v1= mirrorverts[mf->v3];
        mirrormf.v2= mirrorverts[mf->v2];
        mirrormf.v3= mirrorverts[mf->v1];
        mirrormf.v4= (mf->v4)? mirrorverts[mf->v4]: 0;

        /* make sure v4 is not 0 if a quad */
        if(mf->v4 && mirrormf.v4==0) {
            SWAP(unsigned int, mirrormf.v1, mirrormf.v3);
            SWAP(unsigned int, mirrormf.v2, mirrormf.v4);
        }

        hashmf= BLI_ghash_lookup(fhash, &mirrormf);
        if(hashmf) {
            mirrorfaces[a*2]= hashmf - mface;
            mirrorfaces[a*2+1]= mirror_facerotation(&mirrormf, hashmf);
        }
        else
            mirrorfaces[a*2]= -1;
    }

    BLI_ghash_free(fhash, NULL, NULL);
    MEM_freeN(mirrorverts);
    
    return mirrorfaces;
}