blender-archive/source/blender/blenkernel/intern/modifier.c

#include "string.h"
#include "stdarg.h"
#include "math.h"

#include "BLI_blenlib.h"
#include "BLI_rand.h"
#include "BLI_arithb.h"
#include "BLI_edgehash.h"

#include "MEM_guardedalloc.h"

#include "DNA_armature_types.h"
#include "DNA_effect_types.h"
#include "DNA_mesh_types.h"
#include "DNA_meshdata_types.h"
#include "DNA_modifier_types.h"
#include "DNA_object_types.h"
#include "DNA_object_force.h"
#include "DNA_scene_types.h"
#include "DNA_curve_types.h"

#include "BLI_editVert.h"

#include "MTC_matrixops.h"
#include "MTC_vectorops.h"

#include "BKE_anim.h"
#include "BKE_bad_level_calls.h"
#include "BKE_global.h"
#include "BKE_utildefines.h"
#include "BKE_DerivedMesh.h"
#include "BKE_booleanops.h"
#include "BKE_displist.h"
#include "BKE_modifier.h"
#include "BKE_lattice.h"
#include "BKE_subsurf.h"
#include "BKE_object.h"
#include "BKE_mesh.h"
#include "BKE_softbody.h"
#include "depsgraph_private.h"

#include "LOD_DependKludge.h"
#include "LOD_decimation.h"

#include "CCGSubSurf.h"

/* helper function for modifiers - usage is of this is discouraged, but
   avoids duplicate modifier code for DispListMesh and EditMesh */

DispListMesh *displistmesh_from_editmesh(EditMesh *em)
{
	DispListMesh *outDLM = MEM_callocN(sizeof(*outDLM), "em_mod_dlm");
	EditVert *eve, *preveve;
	EditEdge *eed;
	EditFace *efa;
	int i;

	for (i=0,eve=em->verts.first; eve; eve= eve->next)
		eve->prev = (EditVert*) i++;

	outDLM->totvert = BLI_countlist(&em->verts);
	outDLM->totedge = BLI_countlist(&em->edges);
	outDLM->totface = BLI_countlist(&em->faces);

	outDLM->mvert = MEM_mallocN(sizeof(*outDLM->mvert)*outDLM->totvert,
	                           "em_mod_mv");
	outDLM->medge = MEM_mallocN(sizeof(*outDLM->medge)*outDLM->totedge,
	                           "em_mod_med");
	outDLM->mface = MEM_mallocN(sizeof(*outDLM->mface)*outDLM->totface,
	                           "em_mod_mf");

	/* Need to be able to mark loose edges */
	for (eed=em->edges.first; eed; eed=eed->next) {
		eed->f2 = 0;
	}
	for (efa=em->faces.first; efa; efa=efa->next) {
		efa->e1->f2 = 1;
		efa->e2->f2 = 1;
		efa->e3->f2 = 1;
		if (efa->e4) efa->e4->f2 = 1;
	}

	for (i=0,eve=em->verts.first; i<outDLM->totvert; i++,eve=eve->next) {
		MVert *mv = &outDLM->mvert[i];

		VECCOPY(mv->co, eve->co);
		mv->mat_nr = 0;
		mv->flag = ME_VERT_STEPINDEX;
	}
	for (i=0,eed=em->edges.first; i<outDLM->totedge; i++,eed=eed->next) {
		MEdge *med = &outDLM->medge[i];

		med->v1 = (int) eed->v1->prev;
		med->v2 = (int) eed->v2->prev;
		med->crease = (unsigned char) (eed->crease*255.0f);
		med->flag = ME_EDGEDRAW|ME_EDGERENDER|ME_EDGE_STEPINDEX;
		
		if (eed->seam) med->flag |= ME_SEAM;
		if (!eed->f2) med->flag |= ME_LOOSEEDGE;
	}
	for (i=0,efa=em->faces.first; i<outDLM->totface; i++,efa=efa->next) {
		MFace *mf = &outDLM->mface[i];
		mf->v1 = (int) efa->v1->prev;
		mf->v2 = (int) efa->v2->prev;
		mf->v3 = (int) efa->v3->prev;
		mf->v4 = efa->v4?(int) efa->v4->prev:0;
		mf->mat_nr = efa->mat_nr;
		mf->flag = efa->flag|ME_FACE_STEPINDEX;
		test_index_face(mf, NULL, NULL, efa->v4?4:3);
	}

	for (preveve=NULL, eve=em->verts.first; eve; preveve=eve, eve= eve->next)
		eve->prev = preveve;

	return outDLM;
}

/***/

static int noneModifier_isDisabled(ModifierData *md)
{
	return 1;
}

/* Curve */

static void curveModifier_copyData(ModifierData *md, ModifierData *target)
{
	CurveModifierData *cmd = (CurveModifierData*) md;
	CurveModifierData *tcmd = (CurveModifierData*) target;

	tcmd->object = cmd->object;
}

static int curveModifier_isDisabled(ModifierData *md)
{
	CurveModifierData *cmd = (CurveModifierData*) md;

	return !cmd->object;
}

static void curveModifier_foreachObjectLink(ModifierData *md, Object *ob, void (*walk)(void *userData, Object *ob, Object **obpoin), void *userData)
{
	CurveModifierData *cmd = (CurveModifierData*) md;

	walk(userData, ob, &cmd->object);
}

static void curveModifier_updateDepgraph(ModifierData *md, DagForest *forest, Object *ob, DagNode *obNode)
{
	CurveModifierData *cmd = (CurveModifierData*) md;

	if (cmd->object) {
		DagNode *curNode = dag_get_node(forest, cmd->object);

		dag_add_relation(forest, curNode, obNode, DAG_RL_DATA_DATA|DAG_RL_OB_DATA);
	}
}

static void curveModifier_deformVerts(ModifierData *md, Object *ob, void *derivedData, float (*vertexCos)[3], int numVerts)
{
	CurveModifierData *cmd = (CurveModifierData*) md;

	curve_deform_verts(cmd->object, ob, vertexCos, numVerts, cmd->name);
}

static void curveModifier_deformVertsEM(ModifierData *md, Object *ob, void *editData, void *derivedData, float (*vertexCos)[3], int numVerts)
{
	curveModifier_deformVerts(md, ob, NULL, vertexCos, numVerts);
}

/* Lattice */

static void latticeModifier_copyData(ModifierData *md, ModifierData *target)
{
	LatticeModifierData *lmd = (LatticeModifierData*) md;
	LatticeModifierData *tlmd = (LatticeModifierData*) target;

	tlmd->object = lmd->object;
}

static int latticeModifier_isDisabled(ModifierData *md)
{
	LatticeModifierData *lmd = (LatticeModifierData*) md;

	return !lmd->object;
}

static void latticeModifier_foreachObjectLink(ModifierData *md, Object *ob, void (*walk)(void *userData, Object *ob, Object **obpoin), void *userData)
{
	LatticeModifierData *lmd = (LatticeModifierData*) md;

	walk(userData, ob, &lmd->object);
}

static void latticeModifier_updateDepgraph(ModifierData *md, DagForest *forest, Object *ob, DagNode *obNode)
{
	LatticeModifierData *lmd = (LatticeModifierData*) md;

	if (lmd->object) {
		DagNode *latNode = dag_get_node(forest, lmd->object);

		dag_add_relation(forest, latNode, obNode, DAG_RL_DATA_DATA|DAG_RL_OB_DATA);
	}
}

static void latticeModifier_deformVerts(ModifierData *md, Object *ob, void *derivedData, float (*vertexCos)[3], int numVerts)
{
	LatticeModifierData *lmd = (LatticeModifierData*) md;

	lattice_deform_verts(lmd->object, ob, vertexCos, numVerts, lmd->name);
}

static void latticeModifier_deformVertsEM(ModifierData *md, Object *ob, void *editData, void *derivedData, float (*vertexCos)[3], int numVerts)
{
	latticeModifier_deformVerts(md, ob, NULL, vertexCos, numVerts);
}

/* Subsurf */

static void subsurfModifier_initData(ModifierData *md)
{
	SubsurfModifierData *smd = (SubsurfModifierData*) md;
	
	smd->levels = 1;
	smd->renderLevels = 2;
	smd->flags |= eSubsurfModifierFlag_SubsurfUv;
}

static void subsurfModifier_copyData(ModifierData *md, ModifierData *target)
{
	SubsurfModifierData *smd = (SubsurfModifierData*) md;
	SubsurfModifierData *tsmd = (SubsurfModifierData*) target;

	tsmd->flags = smd->flags;
	tsmd->levels = smd->levels;
	tsmd->renderLevels = smd->renderLevels;
	tsmd->subdivType = smd->subdivType;
}

static void subsurfModifier_freeData(ModifierData *md)
{
	SubsurfModifierData *smd = (SubsurfModifierData*) md;

	if (smd->mCache) {
		ccgSubSurf_free(smd->mCache);
	}
	if (smd->emCache) {
		ccgSubSurf_free(smd->emCache);
	}
}	

static void *subsurfModifier_applyModifier(ModifierData *md, Object *ob, void *derivedData, float (*vertexCos)[3], int useRenderParams, int isFinalCalc)
{
	DerivedMesh *dm = derivedData;
	SubsurfModifierData *smd = (SubsurfModifierData*) md;
	Mesh *me = ob->data;

	if (dm) {
		DispListMesh *dlm = dm->convertToDispListMesh(dm, 0);
		int i;

		if (vertexCos) {
			int numVerts = dm->getNumVerts(dm);

			for (i=0; i<numVerts; i++) {
				VECCOPY(dlm->mvert[i].co, vertexCos[i]);
			}
		}

		dm = subsurf_make_derived_from_mesh(me, dlm, smd, useRenderParams, NULL, isFinalCalc);

		return dm;
	} else {
		return subsurf_make_derived_from_mesh(me, NULL, smd, useRenderParams, vertexCos, isFinalCalc);
	}
}

static void *subsurfModifier_applyModifierEM(ModifierData *md, Object *ob, void *editData, void *derivedData, float (*vertexCos)[3])
{
	EditMesh *em = editData;
	DerivedMesh *dm = derivedData;
	SubsurfModifierData *smd = (SubsurfModifierData*) md;

	if (dm) {
		DispListMesh *dlm = dm->convertToDispListMesh(dm, 0);

		dm = subsurf_make_derived_from_dlm_em(dlm, smd, vertexCos);

		return dm;
	} else {
		return subsurf_make_derived_from_editmesh(em, smd, vertexCos);
	}
}

/* Build */

static void buildModifier_initData(ModifierData *md)
{
	BuildModifierData *bmd = (BuildModifierData*) md;

	bmd->start = 1.0;
	bmd->length = 100.0;
}

static void buildModifier_copyData(ModifierData *md, ModifierData *target)
{
	BuildModifierData *bmd = (BuildModifierData*) md;
	BuildModifierData *tbmd = (BuildModifierData*) target;

	tbmd->start = bmd->start;
	tbmd->length = bmd->length;
	tbmd->randomize = bmd->randomize;
	tbmd->seed = bmd->seed;
}

static int buildModifier_dependsOnTime(ModifierData *md)
{
	return 1;
}

static void *buildModifier_applyModifier(ModifierData *md, Object *ob, void *derivedData, float (*vertexCos)[3], int useRenderParams, int isFinalCalc)
{
	DerivedMesh *dm = derivedData;
	BuildModifierData *bmd = (BuildModifierData*) md;
	DispListMesh *dlm=NULL, *ndlm = MEM_callocN(sizeof(*ndlm), "build_dlm");
	MVert *mvert;
	MEdge *medge;
	MFace *mface;
	MCol *mcol;
	TFace *tface;
	int totvert, totedge, totface;
	int i,j;
	float frac;

	if (dm) {
		dlm = dm->convertToDispListMesh(dm, 1);
		mvert = dlm->mvert;
		medge = dlm->medge;
		mface = dlm->mface;
		mcol = dlm->mcol;
		tface = dlm->tface;
		totvert = dlm->totvert;
		totedge = dlm->totedge;
		totface = dlm->totface;
	} else {
		Mesh *me = ob->data;
		mvert = me->mvert;
		medge = me->medge;
		mface = me->mface;
		mcol = me->mcol;
		tface = me->tface;
		totvert = me->totvert;
		totedge = me->totedge;
		totface = me->totface;
	}

	if (ob) {
		frac = bsystem_time(ob, 0, (float)G.scene->r.cfra, bmd->start-1.0f)/bmd->length;
	} else {
		frac = G.scene->r.cfra - bmd->start/bmd->length;
	}
	CLAMP(frac, 0.0, 1.0);

	ndlm->totface = totface*frac;
	ndlm->totedge = totedge*frac;
	if (ndlm->totface) {
		ndlm->mvert = MEM_mallocN(sizeof(*ndlm->mvert)*totvert, "build_mvert");
		memcpy(ndlm->mvert, mvert, sizeof(*mvert)*totvert);
		for (i=0; i<totvert; i++) {
			if (vertexCos)
				VECCOPY(ndlm->mvert[i].co, vertexCos[i]);
			ndlm->mvert[i].flag = 0;
		}

		if (bmd->randomize) {
			ndlm->mface = MEM_dupallocN(mface);
			BLI_array_randomize(ndlm->mface, sizeof(*mface), totface, bmd->seed);

			if (tface) {
				ndlm->tface = MEM_dupallocN(tface);
				BLI_array_randomize(ndlm->tface, sizeof(*tface), totface, bmd->seed);
			} else if (mcol) {
				ndlm->mcol = MEM_dupallocN(mcol);
				BLI_array_randomize(ndlm->mcol, sizeof(*mcol)*4, totface, bmd->seed);
			}
		} else {
			ndlm->mface = MEM_mallocN(sizeof(*ndlm->mface)*ndlm->totface, "build_mf");
			memcpy(ndlm->mface, mface, sizeof(*mface)*ndlm->totface);

			if (tface) {
				ndlm->tface = MEM_mallocN(sizeof(*ndlm->tface)*ndlm->totface, "build_tf");
				memcpy(ndlm->tface, tface, sizeof(*tface)*ndlm->totface);
			} else if (mcol) {
				ndlm->mcol = MEM_mallocN(sizeof(*ndlm->mcol)*4*ndlm->totface, "build_mcol");
				memcpy(ndlm->mcol, mcol, sizeof(*mcol)*4*ndlm->totface);
			}
		}

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

			ndlm->mvert[mf->v1].flag = 1;
			ndlm->mvert[mf->v2].flag = 1;
			ndlm->mvert[mf->v3].flag = 1;
			if (mf->v4) ndlm->mvert[mf->v4].flag = 1;
		}

			/* Store remapped indices in *((int*) mv->no) */
		ndlm->totvert = 0;
		for (i=0; i<totvert; i++) {
			MVert *mv = &ndlm->mvert[i];

			if (mv->flag) 
				*((int*) mv->no) = ndlm->totvert++;
		}

			/* Remap face vertex indices */
		for (i=0; i<ndlm->totface; i++) {
			MFace *mf = &ndlm->mface[i];

			mf->v1 = *((int*) ndlm->mvert[mf->v1].no);
			mf->v2 = *((int*) ndlm->mvert[mf->v2].no);
			mf->v3 = *((int*) ndlm->mvert[mf->v3].no);
			if (mf->v4) mf->v4 = *((int*) ndlm->mvert[mf->v4].no);
		}
			/* Copy in all edges that have both vertices (remap in process) */
		if (totedge) {
			ndlm->totedge = 0;
			ndlm->medge = MEM_mallocN(sizeof(*ndlm->medge)*totedge, "build_med");

			for (i=0; i<totedge; i++) {
				MEdge *med = &medge[i];

				if (ndlm->mvert[med->v1].flag && ndlm->mvert[med->v2].flag) {
					MEdge *nmed = &ndlm->medge[ndlm->totedge++];

					memcpy(nmed, med, sizeof(*med));

					nmed->v1 = *((int*) ndlm->mvert[nmed->v1].no);
					nmed->v2 = *((int*) ndlm->mvert[nmed->v2].no);
				}
			}
		}

			/* Collapse vertex array to remove unused verts */
		for(i=j=0; i<totvert; i++) {
			MVert *mv = &ndlm->mvert[i];

			if (mv->flag) {
				if (j!=i) 
					memcpy(&ndlm->mvert[j], mv, sizeof(*mv));
				j++;
			}
		}
	} else if (ndlm->totedge) {
		ndlm->mvert = MEM_mallocN(sizeof(*ndlm->mvert)*totvert, "build_mvert");
		memcpy(ndlm->mvert, mvert, sizeof(*mvert)*totvert);
		for (i=0; i<totvert; i++) {
			if (vertexCos)
				VECCOPY(ndlm->mvert[i].co, vertexCos[i]);
			ndlm->mvert[i].flag = 0;
		}

		if (bmd->randomize) {
			ndlm->medge = MEM_dupallocN(medge);
			BLI_array_randomize(ndlm->medge, sizeof(*medge), totedge, bmd->seed);
		} else {
			ndlm->medge = MEM_mallocN(sizeof(*ndlm->medge)*ndlm->totedge, "build_mf");
			memcpy(ndlm->medge, medge, sizeof(*medge)*ndlm->totedge);
		}

		for (i=0; i<ndlm->totedge; i++) {
			MEdge *med = &ndlm->medge[i];

			ndlm->mvert[med->v1].flag = 1;
			ndlm->mvert[med->v2].flag = 1;
		}

			/* Store remapped indices in *((int*) mv->no) */
		ndlm->totvert = 0;
		for (i=0; i<totvert; i++) {
			MVert *mv = &ndlm->mvert[i];

			if (mv->flag) 
				*((int*) mv->no) = ndlm->totvert++;
		}

			/* Remap edge vertex indices */
		for (i=0; i<ndlm->totedge; i++) {
			MEdge *med = &ndlm->medge[i];

			med->v1 = *((int*) ndlm->mvert[med->v1].no);
			med->v2 = *((int*) ndlm->mvert[med->v2].no);
		}

			/* Collapse vertex array to remove unused verts */
		for(i=j=0; i<totvert; i++) {
			MVert *mv = &ndlm->mvert[i];

			if (mv->flag) {
				if (j!=i) 
					memcpy(&ndlm->mvert[j], mv, sizeof(*mv));
				j++;
			}
		}
	} else {
		ndlm->totvert = totvert*frac;

		if (bmd->randomize) {
			ndlm->mvert = MEM_dupallocN(mvert);
			BLI_array_randomize(ndlm->mvert, sizeof(*mvert), totvert, bmd->seed);
		} else {
			ndlm->mvert = MEM_mallocN(sizeof(*ndlm->mvert)*ndlm->totvert, "build_mvert");
			memcpy(ndlm->mvert, mvert, sizeof(*mvert)*ndlm->totvert);
		}

		if (vertexCos) {
			for (i=0; i<ndlm->totvert; i++) {
				VECCOPY(ndlm->mvert[i].co, vertexCos[i]);
			}
		}
	}

	if (dlm) displistmesh_free(dlm);

	mesh_calc_normals(ndlm->mvert, ndlm->totvert, ndlm->mface, ndlm->totface, &ndlm->nors);
	
	return derivedmesh_from_displistmesh(ndlm, NULL);
}

/* Array */
/* Array modifier: duplicates the object multiple times along an axis
*/

static void arrayModifier_initData(ModifierData *md)
{
	ArrayModifierData *amd = (ArrayModifierData*) md;

	/* default to 2 duplicates distributed along the x-axis by an
	   offset of 1 object-width
	*/
	amd->curve_ob = amd->offset_ob = NULL;
	amd->count = 2;
	amd->offset[0] = amd->offset[1] = amd->offset[2] = 0;
	amd->scale[0] = 1;
	amd->scale[1] = amd->scale[2] = 0;
	amd->length = 0;
	amd->merge_dist = 0.01;
	amd->fit_type = MOD_ARR_FIXEDCOUNT;
	amd->offset_type = MOD_ARR_OFF_RELATIVE;
	amd->flags = 0;
}

static void arrayModifier_copyData(ModifierData *md, ModifierData *target)
{
	ArrayModifierData *amd = (ArrayModifierData*) md;
	ArrayModifierData *tamd = (ArrayModifierData*) target;

	tamd->curve_ob = amd->curve_ob;
	tamd->offset_ob = amd->offset_ob;
	tamd->count = amd->count;
	VECCOPY(tamd->offset, amd->offset);
	VECCOPY(tamd->scale, amd->scale);
	tamd->length = amd->length;
	tamd->merge_dist = amd->merge_dist;
	tamd->fit_type = amd->fit_type;
	tamd->offset_type = amd->offset_type;
	tamd->flags = amd->flags;
}

static void arrayModifier_foreachObjectLink(ModifierData *md,
                  Object *ob,
                  void (*walk)(void *userData, Object *ob, Object **obpoin),
                  void *userData)
{
	ArrayModifierData *amd = (ArrayModifierData*) md;

	walk(userData, ob, &amd->curve_ob);
	walk(userData, ob, &amd->offset_ob);
}

static void arrayModifier_updateDepgraph(ModifierData *md,
                                         DagForest *forest,
                                         Object *ob,
                                         DagNode *obNode)
{
	ArrayModifierData *amd = (ArrayModifierData*) md;

	if (amd->curve_ob) {
		DagNode *curNode = dag_get_node(forest, amd->curve_ob);

		dag_add_relation(forest, curNode, obNode,
		                 DAG_RL_DATA_DATA|DAG_RL_OB_DATA);
	}
	if (amd->offset_ob) {
		DagNode *curNode = dag_get_node(forest, amd->offset_ob);

		dag_add_relation(forest, curNode, obNode,
		                 DAG_RL_DATA_DATA|DAG_RL_OB_DATA);
	}
}

float displistmesh_width(DispListMesh *dlm, int axis)
{
	int i;
	float min_co, max_co;
	MVert *mv;

	/* if there are no vertices, width is 0 */
	if(dlm->totvert == 0) return 0;

	/* find the minimum and maximum coordinates on the desired axis */
	min_co = max_co = dlm->mvert[0].co[axis];
	for (i=1; i < dlm->totvert; i++) {
		mv = &dlm->mvert[i];

		if(mv->co[axis] < min_co) min_co = mv->co[axis];
		if(mv->co[axis] > max_co) max_co = mv->co[axis];
	}

	return max_co - min_co;
}

typedef struct IndexMapEntry {
	/* the new vert index that this old vert index maps to */
	int new;
	/* -1 if this vert isn't merged, otherwise the old vert index it
	 * should be replaced with
	 */
	int merge;
	/* 1 if this vert's first copy is merged with the last copy of its
	 * merge target, otherwise 0
	 */
	short merge_final;
} IndexMapEntry;

static int calc_mapping(IndexMapEntry *indexMap, int oldVert, int copy)
{
	int newVert;

	if(indexMap[oldVert].merge < 0) {
		newVert = indexMap[oldVert].new + copy + 1;
	} else if(indexMap[oldVert].merge == oldVert) {
		/* This vert was merged with itself */
		newVert = indexMap[oldVert].new;
	} else {
		/* This vert wasn't merged with itself, so increment vert number. */
		newVert = indexMap[indexMap[oldVert].merge].new + copy;
	}

	return newVert;
}

static DispListMesh *arrayModifier_doArray(ArrayModifierData *amd,
                                           Object *ob, DispListMesh *inDLM,
                                           float (*vertexCos)[3],
                                           int initFlags)
{
	int i, j;
	/* offset matrix */
	float offset[4][4];
	float final_offset[4][4];
	float tmp_mat[4][4];
	float length = amd->length;
	int count = amd->count;
	DispListMesh *dlm = MEM_callocN(sizeof(*dlm), "array_dlm");

	IndexMapEntry *indexMap;

	EdgeHash *edges;

	MTC_Mat4One(offset);

	if(amd->offset_type & MOD_ARR_OFF_CONST)
		VecAddf(offset[3], offset[3], amd->offset);
	if(amd->offset_type & MOD_ARR_OFF_RELATIVE) {
		for(j = 0; j < 3; j++)
			offset[3][j] += amd->scale[j] * displistmesh_width(inDLM, j);
	}

	if((amd->offset_type & MOD_ARR_OFF_OBJ) && (amd->offset_ob)) {
		float obinv[4][4];
		float result_mat[4][4];

		if(ob)
			MTC_Mat4Invert(obinv, ob->obmat);
		else
			MTC_Mat4One(obinv);

		MTC_Mat4MulSerie(result_mat, offset,
		                 obinv, amd->offset_ob->obmat,
		                 NULL, NULL, NULL, NULL, NULL);
		MTC_Mat4CpyMat4(offset, result_mat);
	}

	if(amd->fit_type == MOD_ARR_FITCURVE && amd->curve_ob) {
		Curve *cu = amd->curve_ob->data;
		if(cu) {
			if(!cu->path)
				calc_curvepath(amd->curve_ob);

			if(cu->path)
				length = cu->path->totdist;
		}
	}

	/* calculate the maximum number of copies which will fit within the
	   prescribed length */
	if(amd->fit_type == MOD_ARR_FITLENGTH
	   || amd->fit_type == MOD_ARR_FITCURVE) {
		float dist = sqrt(MTC_dot3Float(offset[3], offset[3]));

		if(dist != 0)
			/* this gives length = first copy start to last copy end
			   add a tiny offset for floating point rounding errors */
			count = (length + 0.00001) / dist;
		else
			/* if the offset has no translation, just make one copy */
			count = 1;
	}

	if(count < 1)
		count = 1;

	dlm->totvert = dlm->totedge = dlm->totface = 0;
	indexMap = MEM_callocN(sizeof(*indexMap)*inDLM->totvert, "indexmap");

	/* allocate memory for count duplicates (including original) */
	dlm->mvert = MEM_callocN(sizeof(*dlm->mvert)*inDLM->totvert*count,
	                         "dlm_mvert");
	dlm->mface = MEM_callocN(sizeof(*dlm->mface)*inDLM->totface*count,
	                         "dlm_mface");

	if (inDLM->medge)
		dlm->medge = MEM_callocN(sizeof(*dlm->medge)*inDLM->totedge*count,
		                         "dlm_medge");
	if (inDLM->tface)
		dlm->tface = MEM_callocN(sizeof(*dlm->tface)*inDLM->totface*count,
		                         "dlm_tface");
	if (inDLM->mcol)
		dlm->mcol = MEM_callocN(sizeof(*dlm->mcol)*inDLM->totface*4*count,
		                        "dlm_mcol");

	/* calculate the offset matrix of the final copy (for merging) */ 
	MTC_Mat4One(final_offset);

	for(j=0; j < count - 1; j++) {
		MTC_Mat4MulMat4(tmp_mat, final_offset, offset);
		MTC_Mat4CpyMat4(final_offset, tmp_mat);
	}

	for (i=0; i<inDLM->totvert; i++) {
		MVert *inMV = &inDLM->mvert[i];
		MVert *mv = &dlm->mvert[dlm->totvert++];
		MVert *mv2;
		float co[3];

		*mv = *inMV;

		if (vertexCos) {
			VECCOPY(mv->co, vertexCos[i]);
		}
		if (initFlags) mv->flag |= ME_VERT_STEPINDEX;

		indexMap[i].new = dlm->totvert-1;
		indexMap[i].merge = -1; /* default to no merge */
		indexMap[i].merge_final = 0; /* default to no merge */

		VECCOPY(co, mv->co);
		
		/* Attempts to merge verts from one duplicate with verts from the
		 * next duplicate which are closer than amd->merge_dist.
		 * Only the first such vert pair is merged.
		 * If verts are merged in the first duplicate pair, they are merged
		 * in all pairs.
		 */
		if((count > 1) && (amd->flags & MOD_ARR_MERGE)) {
			float tmp_co[3];
			VECCOPY(tmp_co, mv->co);
			MTC_Mat4MulVecfl(offset, tmp_co);

			for(j = 0; j < inDLM->totvert; j++) {
				inMV = &inDLM->mvert[j];
				/* if this vert is within merge limit, merge */
				if(VecLenCompare(tmp_co, inMV->co, amd->merge_dist)) {
					indexMap[i].merge = j;

					/* test for merging with final copy of merge target */
					if(amd->flags & MOD_ARR_MERGEFINAL) {
						inMV = &inDLM->mvert[i];
						VECCOPY(tmp_co, inDLM->mvert[j].co);
						MTC_Mat4MulVecfl(final_offset, tmp_co);
						if(VecLenCompare(tmp_co, inMV->co, amd->merge_dist))
							indexMap[i].merge_final = 1;
					}
					break;
				}
			}
		}

		/* if no merging, generate copies of this vert */
		if(indexMap[i].merge < 0) {
			for(j=0; j < count - 1; j++) {
				mv2 = &dlm->mvert[dlm->totvert++];

				*mv2 = *mv;
				MTC_Mat4MulVecfl(offset, co);
				VECCOPY(mv2->co, co);
				mv2->flag &= ~ME_VERT_STEPINDEX;
			}
		} else if(indexMap[i].merge != i && indexMap[i].merge_final) {
			/* if this vert is not merging with itself, and it is merging
			 * with the final copy of its merge target, remove the first copy
			 */
			dlm->totvert--;
		}
	}

	/* make a hashtable so we can avoid duplicate edges from merging */
	edges = BLI_edgehash_new();

	for (i=0; i<inDLM->totedge; i++) {
		MEdge *inMED = &inDLM->medge[i];
		MEdge med;
		MEdge *med2;
		int vert1, vert2;

		med = *inMED;
		med.v1 = indexMap[inMED->v1].new;
		med.v2 = indexMap[inMED->v2].new;

		/* if vertices are to be merged with the final copies of their
		 * merge targets, calculate that final copy
		 */
		if(indexMap[inMED->v1].merge_final) {
			med.v1 = calc_mapping(indexMap, indexMap[inMED->v1].merge,
			                      count - 2);
		}
		if(indexMap[inMED->v2].merge_final) {
			med.v2 = calc_mapping(indexMap, indexMap[inMED->v2].merge,
			                      count - 2);
		}

		if (initFlags) {
			med.flag |= ME_EDGEDRAW|ME_EDGERENDER|ME_EDGE_STEPINDEX;
		}

		if(!BLI_edgehash_haskey(edges, med.v1, med.v2)) {
			dlm->medge[dlm->totedge++] = med;
			BLI_edgehash_insert(edges, med.v1, med.v2, NULL);
		}

		for(j=0; j < count - 1; j++)
		{
			vert1 = calc_mapping(indexMap, inMED->v1, j);
			vert2 = calc_mapping(indexMap, inMED->v2, j);
			/* avoid duplicate edges */
			if(!BLI_edgehash_haskey(edges, vert1, vert2)) {
				med2 = &dlm->medge[dlm->totedge++];

				*med2 = med;
				med2->v1 = vert1;
				med2->v2 = vert2;
				med2->flag &= ~ME_EDGE_STEPINDEX;

				BLI_edgehash_insert(edges, med2->v1, med2->v2, NULL);
			}
		}
	}

	/* don't need the hashtable any more */
	BLI_edgehash_free(edges, NULL);

	for (i=0; i<inDLM->totface; i++) {
		MFace *inMF = &inDLM->mface[i];
		MFace *mf = &dlm->mface[dlm->totface++];
		MFace *mf2;
		TFace *tf = NULL;
		MCol *mc = NULL;

		*mf = *inMF;
		mf->v1 = indexMap[inMF->v1].new;
		mf->v2 = indexMap[inMF->v2].new;
		mf->v3 = indexMap[inMF->v3].new;
		mf->v4 = indexMap[inMF->v4].new;

		/* if vertices are to be merged with the final copies of their
		 * merge targets, calculate that final copy
		 */
		if(indexMap[inMF->v1].merge_final)
			mf->v1 = calc_mapping(indexMap, indexMap[inMF->v1].merge, count-2);
		if(indexMap[inMF->v2].merge_final)
			mf->v2 = calc_mapping(indexMap, indexMap[inMF->v2].merge, count-2);
		if(indexMap[inMF->v3].merge_final)
			mf->v3 = calc_mapping(indexMap, indexMap[inMF->v3].merge, count-2);
		if(indexMap[inMF->v4].merge_final)
			mf->v4 = calc_mapping(indexMap, indexMap[inMF->v4].merge, count-2);

		if (initFlags) mf->flag |= ME_FACE_STEPINDEX;

		if (inDLM->tface) {
			TFace *inTF = &inDLM->tface[i];
			TFace *tf = &dlm->tface[dlm->totface-1];

			*tf = *inTF;
		} else if (inDLM->mcol) {
			MCol *inMC = &inDLM->mcol[i*4];
			MCol *mc = &dlm->mcol[(dlm->totface-1)*4];

			mc[0] = inMC[0];
			mc[1] = inMC[1];
			mc[2] = inMC[2];
			mc[3] = inMC[3];
		}
		
		for(j=0; j < count - 1; j++)
		{
			mf2 = &dlm->mface[dlm->totface++];

			*mf2 = *mf;

			mf2->v1 = calc_mapping(indexMap, inMF->v1, j);
			mf2->v2 = calc_mapping(indexMap, inMF->v2, j);
			mf2->v3 = calc_mapping(indexMap, inMF->v3, j);
			if (inMF->v4)
				mf2->v4 = calc_mapping(indexMap, inMF->v4, j);

			mf2->flag &= ~ME_FACE_STEPINDEX;

			if (inDLM->tface) {
				TFace *inTF = &inDLM->tface[i];
				tf = &dlm->tface[dlm->totface-1];

				*tf = *inTF;
			} else if (inDLM->mcol) {
				MCol *inMC = &inDLM->mcol[i*4];
				mc = &dlm->mcol[(dlm->totface-1)*4];

				mc[0] = inMC[0];
				mc[1] = inMC[1];
				mc[2] = inMC[2];
				mc[3] = inMC[3];
			}

			test_index_face(mf2, mc, tf, inMF->v4?4:3);

			/* if the face has fewer than 3 vertices, don't create it */
			if(mf2->v3 == 0)
				dlm->totface--;
		}
	}

	MEM_freeN(indexMap);

	return dlm;
}

static void *arrayModifier_applyModifier_internal(ModifierData *md,
                                                  Object *ob,
                                                  void *derivedData,
                                                  float (*vertexCos)[3],
                                                  int useRenderParams,
                                                  int isFinalCalc)
{
	DerivedMesh *dm = derivedData;
	ArrayModifierData *amd = (ArrayModifierData*) md;
	DispListMesh *outDLM, *inDLM;

	if (dm) {
		inDLM = dm->convertToDispListMesh(dm, 1);
	} else {
		Mesh *me = ob->data;

		inDLM = MEM_callocN(sizeof(*inDLM), "inDLM");
		inDLM->dontFreeVerts = inDLM->dontFreeOther = 1;
		inDLM->mvert = me->mvert;
		inDLM->medge = me->medge;
		inDLM->mface = me->mface;
		inDLM->tface = me->tface;
		inDLM->mcol = me->mcol;
		inDLM->totvert = me->totvert;
		inDLM->totedge = me->totedge;
		inDLM->totface = me->totface;
	}

	outDLM = arrayModifier_doArray(amd, ob, inDLM, vertexCos, dm?0:1);

	displistmesh_free(inDLM);
	
	mesh_calc_normals(outDLM->mvert, outDLM->totvert, outDLM->mface,
	                  outDLM->totface, &outDLM->nors);

	return derivedmesh_from_displistmesh(outDLM, NULL);
}

static void *arrayModifier_applyModifier(ModifierData *md,
                                         Object *ob,
                                         void *derivedData,
                                         float (*vertexCos)[3],
                                         int useRenderParams,
                                         int isFinalCalc)
{
	return arrayModifier_applyModifier_internal(md, ob, derivedData,
	                                            vertexCos, 0, 1);
}

static void *arrayModifier_applyModifierEM(ModifierData *md,
                                           Object *ob,
                                           void *editData,
                                           void *derivedData,
                                           float (*vertexCos)[3])
{
	if (derivedData) {
		return arrayModifier_applyModifier_internal(md, ob, derivedData,
		                                            vertexCos, 0, 1);
	} else {
		ArrayModifierData *amd = (ArrayModifierData*) md;
		DispListMesh *outDLM, *inDLM = displistmesh_from_editmesh(editData);

		outDLM = arrayModifier_doArray(amd, ob, inDLM, vertexCos, 0);

		displistmesh_free(inDLM);

		mesh_calc_normals(outDLM->mvert, outDLM->totvert,
		                  outDLM->mface, outDLM->totface, &outDLM->nors);

		return derivedmesh_from_displistmesh(outDLM, NULL);
	}
}

/* Mirror */

static void mirrorModifier_initData(ModifierData *md)
{
	MirrorModifierData *mmd = (MirrorModifierData*) md;

	mmd->tolerance = 0.001;
}

static void mirrorModifier_copyData(ModifierData *md, ModifierData *target)
{
	MirrorModifierData *mmd = (MirrorModifierData*) md;
	MirrorModifierData *tmmd = (MirrorModifierData*) target;

	tmmd->axis = mmd->axis;
	tmmd->tolerance = mmd->tolerance;
}

static DispListMesh *mirrorModifier__doMirror(MirrorModifierData *mmd, DispListMesh *inDLM, float (*vertexCos)[3], int initFlags)
{
	int i, axis = mmd->axis;
	float tolerance = mmd->tolerance;
	DispListMesh *dlm = MEM_callocN(sizeof(*dlm), "mirror_dlm");
	int (*indexMap)[2];

	dlm->totvert = dlm->totedge = dlm->totface = 0;
	indexMap = MEM_mallocN(sizeof(*indexMap)*inDLM->totvert, "indexmap");
	dlm->mvert = MEM_callocN(sizeof(*dlm->mvert)*inDLM->totvert*2, "dlm_mvert");
	dlm->mface = MEM_callocN(sizeof(*dlm->mface)*inDLM->totface*2, "dlm_mface");

	if (inDLM->medge) dlm->medge = MEM_callocN(sizeof(*dlm->medge)*inDLM->totedge*2, "dlm_medge");
	if (inDLM->tface) dlm->tface = MEM_callocN(sizeof(*dlm->tface)*inDLM->totface*2, "dlm_tface");
	if (inDLM->mcol) dlm->mcol = MEM_callocN(sizeof(*dlm->mcol)*inDLM->totface*4*2, "dlm_mcol");

	for (i=0; i<inDLM->totvert; i++) {
		MVert *inMV = &inDLM->mvert[i];
		MVert *mv = &dlm->mvert[dlm->totvert++];
		int isShared = ABS(inMV->co[axis])<=tolerance;

				/* Because the topology result (# of vertices) must be the same
				 * if the mesh data is overridden by vertex cos, have to calc sharedness
				 * based on original coordinates. This is why we test before copy.
				 */
		*mv = *inMV;
		if (vertexCos) {
			VECCOPY(mv->co, vertexCos[i]);
		}
		if (initFlags) mv->flag |= ME_VERT_STEPINDEX;

		indexMap[i][0] = dlm->totvert-1;
		indexMap[i][1] = !isShared;

		if (isShared) {
			mv->co[axis] = 0;
			mv->flag |= ME_VERT_MERGED;
		} else {
			MVert *mv2 = &dlm->mvert[dlm->totvert++];

			*mv2 = *mv;
			mv2->co[axis] = -mv2->co[axis];
			mv2->flag &= ~ME_VERT_STEPINDEX;
		}
	}

	for (i=0; i<inDLM->totedge; i++) {
		MEdge *inMED = &inDLM->medge[i];
		MEdge *med = &dlm->medge[dlm->totedge++];

		*med = *inMED;
		med->v1 = indexMap[inMED->v1][0];
		med->v2 = indexMap[inMED->v2][0];
		if (initFlags) med->flag |= ME_EDGEDRAW|ME_EDGERENDER|ME_EDGE_STEPINDEX;

		if (indexMap[inMED->v1][1] || indexMap[inMED->v2][1]) {
			MEdge *med2 = &dlm->medge[dlm->totedge++];

			*med2 = *med;
			med2->v1 += indexMap[inMED->v1][1];
			med2->v2 += indexMap[inMED->v2][1];
			med2->flag &= ~ME_EDGE_STEPINDEX;
		}
	}

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

		*mf = *inMF;
		mf->v1 = indexMap[inMF->v1][0];
		mf->v2 = indexMap[inMF->v2][0];
		mf->v3 = indexMap[inMF->v3][0];
		mf->v4 = indexMap[inMF->v4][0];
		if (initFlags) mf->flag |= ME_FACE_STEPINDEX;

		if (inDLM->tface) {
			TFace *inTF = &inDLM->tface[i];
			TFace *tf = &dlm->tface[dlm->totface-1];

			*tf = *inTF;
		} else if (inDLM->mcol) {
			MCol *inMC = &inDLM->mcol[i*4];
			MCol *mc = &dlm->mcol[(dlm->totface-1)*4];

			mc[0] = inMC[0];
			mc[1] = inMC[1];
			mc[2] = inMC[2];
			mc[3] = inMC[3];
		}
		
		if (indexMap[inMF->v1][1] || indexMap[inMF->v2][1] || indexMap[inMF->v3][1] || (mf->v4 && indexMap[inMF->v4][1])) {
			MFace *mf2 = &dlm->mface[dlm->totface++];
			TFace *tf = NULL;
			MCol *mc = NULL;

			*mf2 = *mf;
			mf2->v1 += indexMap[inMF->v1][1];
			mf2->v2 += indexMap[inMF->v2][1];
			mf2->v3 += indexMap[inMF->v3][1];
			if (inMF->v4) mf2->v4 += indexMap[inMF->v4][1];
			mf2->flag &= ~ME_FACE_STEPINDEX;

			if (inDLM->tface) {
				TFace *inTF = &inDLM->tface[i];
				tf = &dlm->tface[dlm->totface-1];

				*tf = *inTF;
			} else if (inDLM->mcol) {
				MCol *inMC = &inDLM->mcol[i*4];
				mc = &dlm->mcol[(dlm->totface-1)*4];

				mc[0] = inMC[0];
				mc[1] = inMC[1];
				mc[2] = inMC[2];
				mc[3] = inMC[3];
			}

				/* Flip face normal */
			SWAP(int, mf2->v1, mf2->v3);
			if (tf) {
				SWAP(unsigned int, tf->col[0], tf->col[2]);
				SWAP(float, tf->uv[0][0], tf->uv[2][0]);
				SWAP(float, tf->uv[0][1], tf->uv[2][1]);
			} else if (mc) {
				SWAP(MCol, mc[0], mc[2]);
			}

			test_index_face(mf2, mc, tf, inMF->v4?4:3);
		}
	}

	MEM_freeN(indexMap);

	return dlm;
}

static void *mirrorModifier_applyModifier__internal(ModifierData *md, Object *ob, void *derivedData, float (*vertexCos)[3], int useRenderParams, int isFinalCalc)
{
	DerivedMesh *dm = derivedData;
	MirrorModifierData *mmd = (MirrorModifierData*) md;
	DispListMesh *outDLM, *inDLM;

	if (dm) {
		inDLM = dm->convertToDispListMesh(dm, 1);
	} else {
		Mesh *me = ob->data;

		inDLM = MEM_callocN(sizeof(*inDLM), "inDLM");
		inDLM->dontFreeVerts = inDLM->dontFreeOther = 1;
		inDLM->mvert = me->mvert;
		inDLM->medge = me->medge;
		inDLM->mface = me->mface;
		inDLM->tface = me->tface;
		inDLM->mcol = me->mcol;
		inDLM->totvert = me->totvert;
		inDLM->totedge = me->totedge;
		inDLM->totface = me->totface;
	}

	outDLM = mirrorModifier__doMirror(mmd, inDLM, vertexCos, dm?0:1);

	displistmesh_free(inDLM);
	
	mesh_calc_normals(outDLM->mvert, outDLM->totvert, outDLM->mface, outDLM->totface, &outDLM->nors);
	
	return derivedmesh_from_displistmesh(outDLM, NULL);
}

static void *mirrorModifier_applyModifier(ModifierData *md, Object *ob, void *derivedData, float (*vertexCos)[3], int useRenderParams, int isFinalCalc)
{
	return mirrorModifier_applyModifier__internal(md, ob, derivedData, vertexCos, 0, 1);
}

static void *mirrorModifier_applyModifierEM(ModifierData *md, Object *ob, void *editData, void *derivedData, float (*vertexCos)[3])
{
	if (derivedData) {
		return mirrorModifier_applyModifier__internal(md, ob, derivedData, vertexCos, 0, 1);
	} else {
		DispListMesh *inDLM, *outDLM;
		MirrorModifierData *mmd = (MirrorModifierData*) md;
		
		inDLM = displistmesh_from_editmesh((EditMesh*)editData);
		outDLM = mirrorModifier__doMirror(mmd, inDLM, vertexCos, 0);
		displistmesh_free(inDLM);

		mesh_calc_normals(outDLM->mvert, outDLM->totvert, outDLM->mface, outDLM->totface, &outDLM->nors);

		return derivedmesh_from_displistmesh(outDLM, NULL);
	}
}

/* Decimate */

static void decimateModifier_initData(ModifierData *md)
{
	DecimateModifierData *dmd = (DecimateModifierData*) md;

	dmd->percent = 1.0;
}

static void decimateModifier_copyData(ModifierData *md, ModifierData *target)
{
	DecimateModifierData *dmd = (DecimateModifierData*) md;
	DecimateModifierData *tdmd = (DecimateModifierData*) target;

	tdmd->percent = dmd->percent;
}

static void *decimateModifier_applyModifier(ModifierData *md, Object *ob, void *derivedData, float (*vertexCos)[3], int useRenderParams, int isFinalCalc)
{
	DecimateModifierData *dmd = (DecimateModifierData*) md;
	DerivedMesh *dm = derivedData;
	Mesh *me = ob->data;
	MVert *mvert;
	MFace *mface;
	DispListMesh *ndlm=NULL, *dlm=NULL;
	LOD_Decimation_Info lod;
	int totvert, totface;
	int a, numTris;

	if (dm) {
		dlm = dm->convertToDispListMesh(dm, 1);
		mvert = dlm->mvert;
		mface = dlm->mface;
		totvert = dlm->totvert;
		totface = dlm->totface;
	} else {
		mvert = me->mvert;
		mface = me->mface;
		totvert = me->totvert;
		totface = me->totface;
	}

	numTris = 0;
	for (a=0; a<totface; a++) {
		MFace *mf = &mface[a];
		numTris++;
		if (mf->v4) numTris++;
	}

	if(numTris<3) {
		modifier_setError(md, "There must be more than 3 input faces (triangles).");
		goto exit;
	}

	lod.vertex_buffer= MEM_mallocN(3*sizeof(float)*totvert, "vertices");
	lod.vertex_normal_buffer= MEM_mallocN(3*sizeof(float)*totvert, "normals");
	lod.triangle_index_buffer= MEM_mallocN(3*sizeof(int)*numTris, "trias");
	lod.vertex_num= totvert;
	lod.face_num= numTris;

	for(a=0; a<totvert; a++) {
		MVert *mv = &mvert[a];
		float *vbCo = &lod.vertex_buffer[a*3];
		float *vbNo = &lod.vertex_normal_buffer[a*3];

		if (vertexCos) {
			VECCOPY(vbCo, vertexCos[a]);
		} else {
			VECCOPY(vbCo, mv->co);
		}

		vbNo[0] = mv->no[0]/32767.0f;
		vbNo[1] = mv->no[1]/32767.0f;
		vbNo[2] = mv->no[2]/32767.0f;
	}

	numTris = 0;
	for(a=0; a<totface; a++) {
		MFace *mf = &mface[a];
		int *tri = &lod.triangle_index_buffer[3*numTris++];
		tri[0]= mf->v1;
		tri[1]= mf->v2;
		tri[2]= mf->v3;

		if(mf->v4) {
			tri = &lod.triangle_index_buffer[3*numTris++];
			tri[0]= mf->v1;
			tri[1]= mf->v3;
			tri[2]= mf->v4;
		}
	}

	dmd->faceCount = 0;
	if(LOD_LoadMesh(&lod) ) {
		if( LOD_PreprocessMesh(&lod) ) {
			/* we assume the decim_faces tells how much to reduce */

			while(lod.face_num > numTris*dmd->percent) {
				if( LOD_CollapseEdge(&lod)==0) break;
			}

			ndlm= MEM_callocN(sizeof(DispListMesh), "dispmesh");
			ndlm->mvert= MEM_callocN(lod.vertex_num*sizeof(MVert), "mvert");
			ndlm->totvert= lod.vertex_num;
			if(lod.vertex_num>2) {
				ndlm->mface= MEM_callocN(lod.face_num*sizeof(MFace), "mface");
				ndlm->totface= dmd->faceCount = lod.face_num;
			}
			for(a=0; a<lod.vertex_num; a++) {
				MVert *mv = &ndlm->mvert[a];
				float *vbCo = &lod.vertex_buffer[a*3];
				
				VECCOPY(mv->co, vbCo);
			}

			if(lod.vertex_num>2) {
				for(a=0; a<lod.face_num; a++) {
					MFace *mf = &ndlm->mface[a];
					int *tri = &lod.triangle_index_buffer[a*3];
					mf->v1 = tri[0];
					mf->v2 = tri[1];
					mf->v3 = tri[2];
					test_index_face(mf, NULL, NULL, 3);
				}
				displistmesh_add_edges(ndlm);
			}
		}
		else {
			modifier_setError(md, "Out of memory.");
		}

		LOD_FreeDecimationData(&lod);
	}
	else {
		modifier_setError(md, "Non-manifold mesh as input.");
	}

	MEM_freeN(lod.vertex_buffer);
	MEM_freeN(lod.vertex_normal_buffer);
	MEM_freeN(lod.triangle_index_buffer);

exit:
	if (dlm) displistmesh_free(dlm);

	if (ndlm) {
		mesh_calc_normals(ndlm->mvert, ndlm->totvert, ndlm->mface, ndlm->totface, &ndlm->nors);

		return derivedmesh_from_displistmesh(ndlm, NULL);
	} else {
		return NULL;
	}
}

/* Wave */

static void waveModifier_initData(ModifierData *md) 
{
	WaveModifierData *wmd = (WaveModifierData*) md; // whadya know, moved here from Iraq
		
	wmd->flag |= (WAV_X+WAV_Y+WAV_CYCL);
	
	wmd->height= 0.5f;
	wmd->width= 1.5f;
	wmd->speed= 0.5f;
	wmd->narrow= 1.5f;
	wmd->lifetime= 0.0f;
	wmd->damp= 10.0f;
}

static void waveModifier_copyData(ModifierData *md, ModifierData *target)
{
	WaveModifierData *wmd = (WaveModifierData*) md;
	WaveModifierData *twmd = (WaveModifierData*) target;

	twmd->damp = wmd->damp;
	twmd->flag = wmd->flag;
	twmd->height = wmd->height;
	twmd->lifetime = wmd->lifetime;
	twmd->narrow = wmd->narrow;
	twmd->speed = wmd->speed;
	twmd->startx = wmd->startx;
	twmd->starty = wmd->starty;
	twmd->timeoffs = wmd->timeoffs;
	twmd->width = wmd->width;
}

static int waveModifier_dependsOnTime(ModifierData *md)
{
	return 1;
}

static void waveModifier_deformVerts(ModifierData *md, Object *ob, void *derivedData, float (*vertexCos)[3], int numVerts)
{
	WaveModifierData *wmd = (WaveModifierData*) md;
	float ctime = bsystem_time(ob, 0, (float)G.scene->r.cfra, 0.0);
	float minfac = (float)(1.0/exp(wmd->width*wmd->narrow*wmd->width*wmd->narrow));
	float lifefac = wmd->height;

	if(wmd->damp==0) wmd->damp= 10.0f;

	if(wmd->lifetime!=0.0) {
		float x= ctime - wmd->timeoffs;

		if(x>wmd->lifetime) {
			lifefac= x-wmd->lifetime;
			
			if(lifefac > wmd->damp) lifefac= 0.0;
			else lifefac= (float)(wmd->height*(1.0 - sqrt(lifefac/wmd->damp)));
		}
	}

	if(lifefac!=0.0) {
		int i;

		for (i=0; i<numVerts; i++) {
			float *co = vertexCos[i];
			float x= co[0]-wmd->startx;
			float y= co[1]-wmd->starty;
			float amplit;

			if(wmd->flag & WAV_X) {
				if(wmd->flag & WAV_Y) amplit= (float)sqrt( (x*x + y*y));
				else amplit= x;
			}
			else amplit= y;
			
			/* this way it makes nice circles */
			amplit-= (ctime-wmd->timeoffs)*wmd->speed;

			if(wmd->flag & WAV_CYCL) {
				amplit = (float)fmod(amplit-wmd->width, 2.0*wmd->width) + wmd->width;
			}

				/* GAUSSIAN */
			if(amplit> -wmd->width && amplit<wmd->width) {
				amplit = amplit*wmd->narrow;
				amplit= (float)(1.0/exp(amplit*amplit) - minfac);

				co[2]+= lifefac*amplit;
			}
		}
	}
}

static void waveModifier_deformVertsEM(ModifierData *md, Object *ob, void *editData, void *derivedData, float (*vertexCos)[3], int numVerts)
{
	waveModifier_deformVerts(md, ob, NULL, vertexCos, numVerts);
}

/* Armature */

static void armatureModifier_initData(ModifierData *md)
{
	ArmatureModifierData *amd = (ArmatureModifierData*) md;
	
	amd->deformflag = ARM_DEF_ENVELOPE|ARM_DEF_VGROUP;
}

static void armatureModifier_copyData(ModifierData *md, ModifierData *target)
{
	ArmatureModifierData *amd = (ArmatureModifierData*) md;
	ArmatureModifierData *tamd = (ArmatureModifierData*) target;

	tamd->object = amd->object;
	tamd->deformflag = amd->deformflag;
}

static int armatureModifier_isDisabled(ModifierData *md)
{
	ArmatureModifierData *amd = (ArmatureModifierData*) md;

	return !amd->object;
}

static void armatureModifier_foreachObjectLink(ModifierData *md, Object *ob, void (*walk)(void *userData, Object *ob, Object **obpoin), void *userData)
{
	ArmatureModifierData *amd = (ArmatureModifierData*) md;

	walk(userData, ob, &amd->object);
}

static void armatureModifier_updateDepgraph(ModifierData *md, DagForest *forest, Object *ob, DagNode *obNode)
{
	ArmatureModifierData *amd = (ArmatureModifierData*) md;

	if (amd->object) {
		DagNode *curNode = dag_get_node(forest, amd->object);

		dag_add_relation(forest, curNode, obNode, DAG_RL_DATA_DATA|DAG_RL_OB_DATA);
	}
}

static void armatureModifier_deformVerts(ModifierData *md, Object *ob, void *derivedData, float (*vertexCos)[3], int numVerts)
{
	ArmatureModifierData *amd = (ArmatureModifierData*) md;

	armature_deform_verts(amd->object, ob, vertexCos, numVerts, amd->deformflag);
}

static void armatureModifier_deformVertsEM(ModifierData *md, Object *ob, void *editData, void *derivedData, float (*vertexCos)[3], int numVerts)
{
	ArmatureModifierData *amd = (ArmatureModifierData*) md;

	armature_deform_verts(amd->object, ob, vertexCos, numVerts, amd->deformflag);
}

/* Hook */

static void hookModifier_initData(ModifierData *md) 
{
	HookModifierData *hmd = (HookModifierData*) md;

	hmd->force= 1.0;
}

static void hookModifier_copyData(ModifierData *md, ModifierData *target)
{
	HookModifierData *hmd = (HookModifierData*) md;
	HookModifierData *thmd = (HookModifierData*) target;

	VECCOPY(thmd->cent, hmd->cent);
	thmd->falloff = hmd->falloff;
	thmd->force = hmd->force;
	thmd->object = hmd->object;
	thmd->totindex = hmd->totindex;
	thmd->indexar = MEM_dupallocN(hmd->indexar);
	memcpy(thmd->parentinv, hmd->parentinv, sizeof(hmd->parentinv));
}

static void hookModifier_freeData(ModifierData *md)
{
	HookModifierData *hmd = (HookModifierData*) md;

	if (hmd->indexar) MEM_freeN(hmd->indexar);
}

static int hookModifier_isDisabled(ModifierData *md)
{
	HookModifierData *hmd = (HookModifierData*) md;

	return !hmd->object;
}

static void hookModifier_foreachObjectLink(ModifierData *md, Object *ob, void (*walk)(void *userData, Object *ob, Object **obpoin), void *userData)
{
	HookModifierData *hmd = (HookModifierData*) md;

	walk(userData, ob, &hmd->object);
}

static void hookModifier_updateDepgraph(ModifierData *md, DagForest *forest, Object *ob, DagNode *obNode)
{
	HookModifierData *hmd = (HookModifierData*) md;

	if (hmd->object) {
		DagNode *curNode = dag_get_node(forest, hmd->object);

		dag_add_relation(forest, curNode, obNode, DAG_RL_OB_DATA);
	}
}

static void hookModifier_deformVerts(ModifierData *md, Object *ob, void *derivedData, float (*vertexCos)[3], int numVerts)
{
	HookModifierData *hmd = (HookModifierData*) md;
	float vec[3], mat[4][4];
	int i;

	Mat4Invert(ob->imat, ob->obmat);
	Mat4MulSerie(mat, ob->imat, hmd->object->obmat, hmd->parentinv, NULL, NULL, NULL, NULL, NULL);

	/* vertex indices? */
	if(hmd->indexar) {
		for (i=0; i<hmd->totindex; i++) {
			int index = hmd->indexar[i];

				/* This should always be true and I don't generally like 
				 * "paranoid" style code like this, but old files can have
				 * indices that are out of range because old blender did
				 * not correct them on exit editmode. - zr
				 */
			if (index<numVerts) {
				float *co = vertexCos[index];
				float fac = hmd->force;

				if(hmd->falloff!=0.0) {
					float len= VecLenf(co, hmd->cent);
					if(len > hmd->falloff) fac = 0.0;
					else if(len>0.0) fac *= sqrt(1.0 - len/hmd->falloff);
				}

				if(fac!=0.0) {
					VecMat4MulVecfl(vec, mat, co);
					VecLerpf(co, co, vec, fac);
				}
			}
		}
	}
	else {	/* vertex group hook */
		bDeformGroup *curdef;
		Mesh *me= ob->data;
		int index=0;
		
		/* find the group (weak loop-in-loop) */
		for (curdef = ob->defbase.first; curdef; curdef=curdef->next, index++)
			if (!strcmp(curdef->name, hmd->name))
				break;
		
		if(curdef && me->dvert) {
			MDeformVert *dvert= me->dvert;
			int i, j;
			
			for (i=0; i < me->totvert; i++, dvert++) {
				for(j=0; j<dvert->totweight; j++) {
					if (dvert->dw[j].def_nr == index) {
						float fac = hmd->force*dvert->dw[j].weight;
						float *co = vertexCos[i];
						
						if(hmd->falloff!=0.0) {
							float len= VecLenf(co, hmd->cent);
							if(len > hmd->falloff) fac = 0.0;
							else if(len>0.0) fac *= sqrt(1.0 - len/hmd->falloff);
						}
						
						VecMat4MulVecfl(vec, mat, co);
						VecLerpf(co, co, vec, fac);

					}
				}
			}
		}

	}
}

static void hookModifier_deformVertsEM(ModifierData *md, Object *ob, void *editData, void *derivedData, float (*vertexCos)[3], int numVerts)
{
	hookModifier_deformVerts(md, ob, derivedData, vertexCos, numVerts);
}

/* Softbody */

static void softbodyModifier_deformVerts(ModifierData *md, Object *ob, void *derivedData, float (*vertexCos)[3], int numVerts)
{
	sbObjectStep(ob, (float)G.scene->r.cfra, vertexCos, numVerts);
}

/* Boolean */

static void booleanModifier_copyData(ModifierData *md, ModifierData *target)
{
	BooleanModifierData *bmd = (BooleanModifierData*) md;
	BooleanModifierData *tbmd = (BooleanModifierData*) target;

	tbmd->object = bmd->object;
	tbmd->operation = bmd->operation;
}

static int booleanModifier_isDisabled(ModifierData *md)
{
	BooleanModifierData *bmd = (BooleanModifierData*) md;

	return !bmd->object;
}

static void booleanModifier_foreachObjectLink(ModifierData *md, Object *ob, void (*walk)(void *userData, Object *ob, Object **obpoin), void *userData)
{
	BooleanModifierData *bmd = (BooleanModifierData*) md;

	walk(userData, ob, &bmd->object);
}

static void booleanModifier_updateDepgraph(ModifierData *md, DagForest *forest, Object *ob, DagNode *obNode)
{
	BooleanModifierData *bmd = (BooleanModifierData*) md;

	if (bmd->object) {
		DagNode *curNode = dag_get_node(forest, bmd->object);

		dag_add_relation(forest, curNode, obNode, DAG_RL_DATA_DATA|DAG_RL_OB_DATA);
	}
}

static void *booleanModifier_applyModifier(ModifierData *md, Object *ob, void *derivedData, float (*vertexCos)[3], int useRenderParams, int isFinalCalc)
{	
		// XXX doesn't handle derived data
	BooleanModifierData *bmd = (BooleanModifierData*) md;
	
	/* we do a quick sanity check */
	if( ((Mesh *)ob->data)->totface>3 && bmd->object && ((Mesh *)bmd->object->data)->totface>3) {
		DispListMesh *dlm= NewBooleanMeshDLM(bmd->object, ob, 1+bmd->operation);
		
		/* if new mesh returned, get derived mesh; otherwise there was
		 * an error, so delete the modifier object */

		if( dlm )
			return derivedmesh_from_displistmesh(dlm, NULL);
		else
			bmd->object = NULL;
	}
	return derivedData;
}

/***/

static ModifierTypeInfo typeArr[NUM_MODIFIER_TYPES];
static int typeArrInit = 1;

ModifierTypeInfo *modifierType_getInfo(ModifierType type)
{
	if (typeArrInit) {
		ModifierTypeInfo *mti;

		memset(typeArr, 0, sizeof(typeArr));

		/* Initialize and return the appropriate type info structure,
		 * assumes that modifier has:
		 *  name == typeName, 
		 *  structName == typeName + 'ModifierData'
		 */
#define INIT_TYPE(typeName) \
	(	strcpy(typeArr[eModifierType_##typeName].name, #typeName), \
		strcpy(typeArr[eModifierType_##typeName].structName, #typeName "ModifierData"), \
		typeArr[eModifierType_##typeName].structSize = sizeof(typeName##ModifierData), \
		&typeArr[eModifierType_##typeName])

		mti = &typeArr[eModifierType_None];
		strcpy(mti->name, "None");
		strcpy(mti->structName, "ModifierData");
		mti->structSize = sizeof(ModifierData);
		mti->type = eModifierType_None;
		mti->flags = eModifierTypeFlag_AcceptsMesh|eModifierTypeFlag_AcceptsCVs;
		mti->isDisabled = noneModifier_isDisabled;

		mti = INIT_TYPE(Curve);
		mti->type = eModifierTypeType_OnlyDeform;
		mti->flags = eModifierTypeFlag_AcceptsCVs | eModifierTypeFlag_SupportsEditmode | eModifierTypeFlag_RequiresOriginalData;
		mti->copyData = curveModifier_copyData;
		mti->isDisabled = curveModifier_isDisabled;
		mti->foreachObjectLink = curveModifier_foreachObjectLink;
		mti->updateDepgraph = curveModifier_updateDepgraph;
		mti->deformVerts = curveModifier_deformVerts;
		mti->deformVertsEM = curveModifier_deformVertsEM;

		mti = INIT_TYPE(Lattice);
		mti->type = eModifierTypeType_OnlyDeform;
		mti->flags = eModifierTypeFlag_AcceptsCVs | eModifierTypeFlag_SupportsEditmode | eModifierTypeFlag_RequiresOriginalData;
		mti->copyData = latticeModifier_copyData;
		mti->isDisabled = latticeModifier_isDisabled;
		mti->foreachObjectLink = latticeModifier_foreachObjectLink;
		mti->updateDepgraph = latticeModifier_updateDepgraph;
		mti->deformVerts = latticeModifier_deformVerts;
		mti->deformVertsEM = latticeModifier_deformVertsEM;

		mti = INIT_TYPE(Subsurf);
		mti->type = eModifierTypeType_Constructive;
		mti->flags = eModifierTypeFlag_AcceptsMesh | eModifierTypeFlag_SupportsMapping | eModifierTypeFlag_SupportsEditmode | eModifierTypeFlag_EnableInEditmode;
		mti->initData = subsurfModifier_initData;
		mti->copyData = subsurfModifier_copyData;
		mti->freeData = subsurfModifier_freeData;
		mti->applyModifier = subsurfModifier_applyModifier;
		mti->applyModifierEM = subsurfModifier_applyModifierEM;

		mti = INIT_TYPE(Build);
		mti->type = eModifierTypeType_Nonconstructive;
		mti->flags = eModifierTypeFlag_AcceptsMesh;
		mti->initData = buildModifier_initData;
		mti->copyData = buildModifier_copyData;
		mti->dependsOnTime = buildModifier_dependsOnTime;
		mti->applyModifier = buildModifier_applyModifier;

		mti = INIT_TYPE(Array);
		mti->type = eModifierTypeType_Constructive;
		mti->flags = eModifierTypeFlag_AcceptsMesh
		             | eModifierTypeFlag_SupportsMapping
		             | eModifierTypeFlag_SupportsEditmode
		             | eModifierTypeFlag_EnableInEditmode;
		mti->initData = arrayModifier_initData;
		mti->copyData = arrayModifier_copyData;
		mti->foreachObjectLink = arrayModifier_foreachObjectLink;
		mti->updateDepgraph = arrayModifier_updateDepgraph;
		mti->applyModifier = arrayModifier_applyModifier;
		mti->applyModifierEM = arrayModifier_applyModifierEM;

		mti = INIT_TYPE(Mirror);
		mti->type = eModifierTypeType_Constructive;
		mti->flags = eModifierTypeFlag_AcceptsMesh | eModifierTypeFlag_SupportsMapping | eModifierTypeFlag_SupportsEditmode | eModifierTypeFlag_EnableInEditmode;
		mti->initData = mirrorModifier_initData;
		mti->copyData = mirrorModifier_copyData;
		mti->applyModifier = mirrorModifier_applyModifier;
		mti->applyModifierEM = mirrorModifier_applyModifierEM;

		mti = INIT_TYPE(Decimate);
		mti->type = eModifierTypeType_Nonconstructive;
		mti->flags = eModifierTypeFlag_AcceptsMesh;
		mti->initData = decimateModifier_initData;
		mti->copyData = decimateModifier_copyData;
		mti->applyModifier = decimateModifier_applyModifier;

		mti = INIT_TYPE(Wave);
		mti->type = eModifierTypeType_OnlyDeform;
		mti->flags = eModifierTypeFlag_AcceptsCVs | eModifierTypeFlag_SupportsEditmode;
		mti->initData = waveModifier_initData;
		mti->copyData = waveModifier_copyData;
		mti->dependsOnTime = waveModifier_dependsOnTime;
		mti->deformVerts = waveModifier_deformVerts;
		mti->deformVertsEM = waveModifier_deformVertsEM;

		mti = INIT_TYPE(Armature);
		mti->type = eModifierTypeType_OnlyDeform;
		mti->flags = eModifierTypeFlag_AcceptsCVs | eModifierTypeFlag_SupportsEditmode | eModifierTypeFlag_RequiresOriginalData;
		mti->initData = armatureModifier_initData;
		mti->copyData = armatureModifier_copyData;
		mti->isDisabled = armatureModifier_isDisabled;
		mti->foreachObjectLink = armatureModifier_foreachObjectLink;
		mti->updateDepgraph = armatureModifier_updateDepgraph;
		mti->deformVerts = armatureModifier_deformVerts;
		mti->deformVertsEM = armatureModifier_deformVertsEM;

		mti = INIT_TYPE(Hook);
		mti->type = eModifierTypeType_OnlyDeform;
		mti->flags = eModifierTypeFlag_AcceptsCVs | eModifierTypeFlag_SupportsEditmode | eModifierTypeFlag_RequiresOriginalData;
		mti->initData = hookModifier_initData;
		mti->copyData = hookModifier_copyData;
		mti->freeData = hookModifier_freeData;
		mti->isDisabled = hookModifier_isDisabled;
		mti->foreachObjectLink = hookModifier_foreachObjectLink;
		mti->updateDepgraph = hookModifier_updateDepgraph;
		mti->deformVerts = hookModifier_deformVerts;
		mti->deformVertsEM = hookModifier_deformVertsEM;

		mti = INIT_TYPE(Softbody);
		mti->type = eModifierTypeType_OnlyDeform;
		mti->flags = eModifierTypeFlag_AcceptsCVs | eModifierTypeFlag_RequiresOriginalData;
		mti->deformVerts = softbodyModifier_deformVerts;

		mti = INIT_TYPE(Boolean);
		mti->type = eModifierTypeType_Nonconstructive;
		mti->flags = eModifierTypeFlag_AcceptsMesh;
		mti->copyData = booleanModifier_copyData;
		mti->isDisabled = booleanModifier_isDisabled;
		mti->applyModifier = booleanModifier_applyModifier;
		mti->foreachObjectLink = booleanModifier_foreachObjectLink;
		mti->updateDepgraph = booleanModifier_updateDepgraph;

		typeArrInit = 0;
#undef INIT_TYPE
	}

	if (type>=0 && type<NUM_MODIFIER_TYPES && typeArr[type].name[0]!='\0') {
		return &typeArr[type];
	} else {
		return NULL;
	}
}

/***/

ModifierData *modifier_new(int type)
{
	ModifierTypeInfo *mti = modifierType_getInfo(type);
	ModifierData *md = MEM_callocN(mti->structSize, mti->structName);

	strcpy(md->name, mti->name);

	md->type = type;
	md->mode = eModifierMode_Realtime|eModifierMode_Render|eModifierMode_Expanded;

	if (mti->flags&eModifierTypeFlag_EnableInEditmode)
		md->mode |= eModifierMode_Editmode;

	if (mti->initData) mti->initData(md);

	return md;
}

void modifier_free(ModifierData *md) 
{
	ModifierTypeInfo *mti = modifierType_getInfo(md->type);

	if (mti->freeData) mti->freeData(md);
	if (md->error) MEM_freeN(md->error);

	MEM_freeN(md);
}

int modifier_dependsOnTime(ModifierData *md) 
{
	ModifierTypeInfo *mti = modifierType_getInfo(md->type);

	return mti->dependsOnTime && mti->dependsOnTime(md);
}

int modifier_supportsMapping(ModifierData *md)
{
	ModifierTypeInfo *mti = modifierType_getInfo(md->type);

	return (	(mti->flags&eModifierTypeFlag_SupportsEditmode) &&
				(	(mti->type==eModifierTypeType_OnlyDeform ||
					(mti->flags&eModifierTypeFlag_SupportsMapping))) );
}

ModifierData *modifiers_findByType(Object *ob, ModifierType type)
{
	ModifierData *md = ob->modifiers.first;

	for (; md; md=md->next)
		if (md->type==type)
			break;

	return md;
}

void modifiers_clearErrors(Object *ob)
{
	ModifierData *md = ob->modifiers.first;
	int qRedraw = 0;

	for (; md; md=md->next) {
		if (md->error) {
			MEM_freeN(md->error);
			md->error = NULL;

			qRedraw = 1;
		}
	}

	if (qRedraw) allqueue(REDRAWBUTSEDIT, 0);
}

void modifiers_foreachObjectLink(Object *ob, void (*walk)(void *userData, Object *ob, Object **obpoin), void *userData)
{
	ModifierData *md = ob->modifiers.first;

	for (; md; md=md->next) {
		ModifierTypeInfo *mti = modifierType_getInfo(md->type);

		if (mti->foreachObjectLink) mti->foreachObjectLink(md, ob, walk, userData);
	}
}

void modifier_copyData(ModifierData *md, ModifierData *target)
{
	ModifierTypeInfo *mti = modifierType_getInfo(md->type);

	target->mode = md->mode;

	if (mti->copyData)
		mti->copyData(md, target);
}

int modifier_couldBeCage(ModifierData *md)
{
	ModifierTypeInfo *mti = modifierType_getInfo(md->type);

	return (	(md->mode&eModifierMode_Realtime) &&
				(md->mode&eModifierMode_Editmode) &&
				(!mti->isDisabled || !mti->isDisabled(md)) &&
				modifier_supportsMapping(md));	
}

void modifier_setError(ModifierData *md, char *format, ...)
{
	char buffer[2048];
	va_list ap;

	va_start(ap, format);
	vsprintf(buffer, format, ap);
	va_end(ap);

	if (md->error)
		MEM_freeN(md->error);

	md->error = BLI_strdup(buffer);

	allqueue(REDRAWBUTSEDIT, 0);
}

/* used for buttons, to find out if the 'draw deformed in editmode' option is there */
/* also used in transform_conversion.c, to detect CrazySpace [tm] (2nd arg then is NULL) */
int modifiers_getCageIndex(Object *ob, int *lastPossibleCageIndex_r)
{
	ModifierData *md = ob->modifiers.first;
	int i, cageIndex = -1;

		/* Find the last modifier acting on the cage. */
	for (i=0; md; i++,md=md->next) {
		ModifierTypeInfo *mti = modifierType_getInfo(md->type);

		if (!(md->mode&eModifierMode_Realtime)) continue;
		if (!(md->mode&eModifierMode_Editmode)) continue;
		if (mti->isDisabled && mti->isDisabled(md)) continue;
		if (!(mti->flags&eModifierTypeFlag_SupportsEditmode)) continue;

		if (!modifier_supportsMapping(md))
			break;

		if (lastPossibleCageIndex_r) *lastPossibleCageIndex_r = i;
		if (md->mode&eModifierMode_OnCage)
			cageIndex = i;
	}

	return cageIndex;
}


int modifiers_isSoftbodyEnabled(Object *ob)
{
	ModifierData *md = modifiers_findByType(ob, eModifierType_Softbody);

		/* Softbody not allowed in this situation, enforce! */
	/* if (md && ob->pd && ob->pd->deflect) {	*/
	/* no reason for that any more BM */
	if (0) {
		md->mode &= ~(eModifierMode_Realtime|eModifierMode_Render|eModifierMode_Editmode);
		md = NULL;
	}

	return (md && md->mode&(eModifierMode_Realtime|eModifierMode_Render));
}

ModifierData *modifiers_getVirtualModifierList(Object *ob)
{
		/* Kinda hacky, but should be fine since we are never
		 * reentrant and avoid free hassles.
		 */
	static ArmatureModifierData amd;
	static CurveModifierData cmd;
	static LatticeModifierData lmd;
	static int init = 1;

	if (init) {
		ModifierData *md;

		md = modifier_new(eModifierType_Armature);
		amd = *((ArmatureModifierData*) md);
		modifier_free(md);

		md = modifier_new(eModifierType_Curve);
		cmd = *((CurveModifierData*) md);
		modifier_free(md);

		md = modifier_new(eModifierType_Lattice);
		lmd = *((LatticeModifierData*) md);
		modifier_free(md);

		amd.modifier.mode |= eModifierMode_Virtual;
		cmd.modifier.mode |= eModifierMode_Virtual;
		lmd.modifier.mode |= eModifierMode_Virtual;

		init = 0;
	}

	if (ob->parent) {
		if(ob->parent->type==OB_ARMATURE && ob->partype==PARSKEL) {
			amd.object = ob->parent;
			amd.modifier.next = ob->modifiers.first;
			amd.deformflag= ((bArmature *)(ob->parent->data))->deformflag;
			return &amd.modifier;
		} else if(ob->parent->type==OB_CURVE && ob->partype==PARSKEL) {
			cmd.object = ob->parent;
			cmd.modifier.next = ob->modifiers.first;
			return &cmd.modifier;
		} else if(ob->parent->type==OB_LATTICE && ob->partype==PARSKEL) {
			lmd.object = ob->parent;
			lmd.modifier.next = ob->modifiers.first;
			return &lmd.modifier;
		}
	}

	return ob->modifiers.first;
}
/* Takes an object and returns its first selected armature, else just its armature
   This should work for multiple armatures per object */
Object *modifiers_isDeformedByArmature(Object *ob)
{
	ModifierData *md = modifiers_getVirtualModifierList(ob);
	ArmatureModifierData *amd= NULL;
	
	/* return the first selected armaturem, this lets us use multiple armatures */
	for (; md; md=md->next) {
		if (md->type==eModifierType_Armature) {
			amd = (ArmatureModifierData*) md;
			if (amd->object && (amd->object->flag & SELECT))
				return amd->object;
		}
	}
	
	if (amd) /* if were still here then return the last armature */
		return amd->object;
	
	return NULL;
}

int modifiers_usesArmature(Object *ob, bArmature *arm)
{
	ModifierData *md = modifiers_getVirtualModifierList(ob);

	for (; md; md=md->next) {
		if (md->type==eModifierType_Armature) {
			ArmatureModifierData *amd = (ArmatureModifierData*) md;
			if (amd->object->data==arm) 
				return 1;
		}
	}

	return 0;
}

int modifiers_isDeformed(Object *ob)
{
	ModifierData *md = modifiers_getVirtualModifierList(ob);
	
	for (; md; md=md->next) {
		if(ob==G.obedit && (md->mode & eModifierMode_Editmode)==0);
		else {
			if (md->type==eModifierType_Armature)
				return 1;
			if (md->type==eModifierType_Curve)
				return 1;
			if (md->type==eModifierType_Lattice)
				return 1;
		}
	}
	return 0;
}