/*
 * ***** BEGIN GPL LICENSE BLOCK *****
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
 * All rights reserved.
 *
 * The Original Code is: all of this file.
 *
 * Contributor(s): none yet.
 *
 * ***** END GPL LICENSE BLOCK *****
 */

/** \file blender/blenkernel/intern/lattice.c
 *  \ingroup bke
 */



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

#include "MEM_guardedalloc.h"

#include "BLI_blenlib.h"
#include "BLI_bpath.h"
#include "BLI_math.h"
#include "BLI_utildefines.h"

#include "DNA_mesh_types.h"
#include "DNA_meshdata_types.h"
#include "DNA_scene_types.h"
#include "DNA_object_types.h"
#include "DNA_lattice_types.h"
#include "DNA_curve_types.h"
#include "DNA_key_types.h"

#include "BKE_animsys.h"
#include "BKE_anim.h"
#include "BKE_cdderivedmesh.h"
#include "BKE_displist.h"
#include "BKE_global.h"
#include "BKE_key.h"
#include "BKE_lattice.h"
#include "BKE_library.h"
#include "BKE_main.h"
#include "BKE_mesh.h"
#include "BKE_modifier.h"

#include "BKE_deform.h"

//XXX #include "BIF_editdeform.h"

void calc_lat_fudu(int flag, int res, float *fu, float *du)
{
	if (res==1) {
		*fu= 0.0;
		*du= 0.0;
	}
	else if (flag & LT_GRID) {
		*fu= -0.5f*(res-1);
		*du= 1.0f;
	}
	else {
		*fu= -1.0f;
		*du= 2.0f/(res-1);
	}
}

void resizelattice(Lattice *lt, int uNew, int vNew, int wNew, Object *ltOb)
{
	BPoint *bp;
	int i, u, v, w;
	float fu, fv, fw, uc, vc, wc, du=0.0, dv=0.0, dw=0.0;
	float *co, (*vertexCos)[3] = NULL;
	
	/* vertex weight groups are just freed all for now */
	if (lt->dvert) {
		free_dverts(lt->dvert, lt->pntsu*lt->pntsv*lt->pntsw);
		lt->dvert= NULL;
	}
	
	while (uNew*vNew*wNew > 32000) {
		if ( uNew>=vNew && uNew>=wNew) uNew--;
		else if ( vNew>=uNew && vNew>=wNew) vNew--;
		else wNew--;
	}

	vertexCos = MEM_mallocN(sizeof(*vertexCos)*uNew*vNew*wNew, "tmp_vcos");

	calc_lat_fudu(lt->flag, uNew, &fu, &du);
	calc_lat_fudu(lt->flag, vNew, &fv, &dv);
	calc_lat_fudu(lt->flag, wNew, &fw, &dw);

		/* If old size is different then resolution changed in interface,
		 * try to do clever reinit of points. Pretty simply idea, we just
		 * deform new verts by old lattice, but scaling them to match old
		 * size first.
		 */
	if (ltOb) {
		if (uNew!=1 && lt->pntsu!=1) {
			fu = lt->fu;
			du = (lt->pntsu-1)*lt->du/(uNew-1);
		}

		if (vNew!=1 && lt->pntsv!=1) {
			fv = lt->fv;
			dv = (lt->pntsv-1)*lt->dv/(vNew-1);
		}

		if (wNew!=1 && lt->pntsw!=1) {
			fw = lt->fw;
			dw = (lt->pntsw-1)*lt->dw/(wNew-1);
		}
	}

	co = vertexCos[0];
	for (w=0,wc=fw; w<wNew; w++,wc+=dw) {
		for (v=0,vc=fv; v<vNew; v++,vc+=dv) {
			for (u=0,uc=fu; u<uNew; u++,co+=3,uc+=du) {
				co[0] = uc;
				co[1] = vc;
				co[2] = wc;
			}
		}
	}
	
	if (ltOb) {
		float mat[4][4];
		int typeu = lt->typeu, typev = lt->typev, typew = lt->typew;

			/* works best if we force to linear type (endpoints match) */
		lt->typeu = lt->typev = lt->typew = KEY_LINEAR;

			/* prevent using deformed locations */
		freedisplist(&ltOb->disp);

		copy_m4_m4(mat, ltOb->obmat);
		unit_m4(ltOb->obmat);
		lattice_deform_verts(ltOb, NULL, NULL, vertexCos, uNew*vNew*wNew, NULL, 1.0f);
		copy_m4_m4(ltOb->obmat, mat);

		lt->typeu = typeu;
		lt->typev = typev;
		lt->typew = typew;
	}

	lt->fu = fu;
	lt->fv = fv;
	lt->fw = fw;
	lt->du = du;
	lt->dv = dv;
	lt->dw = dw;

	lt->pntsu = uNew;
	lt->pntsv = vNew;
	lt->pntsw = wNew;

	MEM_freeN(lt->def);
	lt->def= MEM_callocN(lt->pntsu*lt->pntsv*lt->pntsw*sizeof(BPoint), "lattice bp");
	
	bp= lt->def;
	
	for (i=0; i<lt->pntsu*lt->pntsv*lt->pntsw; i++,bp++) {
		copy_v3_v3(bp->vec, vertexCos[i]);
	}

	MEM_freeN(vertexCos);
}

Lattice *add_lattice(const char *name)
{
	Lattice *lt;
	
	lt= alloc_libblock(&G.main->latt, ID_LT, name);
	
	lt->flag= LT_GRID;
	
	lt->typeu= lt->typev= lt->typew= KEY_BSPLINE;
	
	lt->def= MEM_callocN(sizeof(BPoint), "lattvert"); /* temporary */
	resizelattice(lt, 2, 2, 2, NULL);	/* creates a uniform lattice */
		
	return lt;
}

Lattice *copy_lattice(Lattice *lt)
{
	Lattice *ltn;

	ltn= copy_libblock(&lt->id);
	ltn->def= MEM_dupallocN(lt->def);

	ltn->key= copy_key(ltn->key);
	if (ltn->key) ltn->key->from= (ID *)ltn;
	
	if (lt->dvert) {
		int tot= lt->pntsu*lt->pntsv*lt->pntsw;
		ltn->dvert = MEM_mallocN (sizeof (MDeformVert)*tot, "Lattice MDeformVert");
		copy_dverts(ltn->dvert, lt->dvert, tot);
	}

	ltn->editlatt= NULL;

	return ltn;
}

void free_lattice(Lattice *lt)
{
	if (lt->def) MEM_freeN(lt->def);
	if (lt->dvert) free_dverts(lt->dvert, lt->pntsu*lt->pntsv*lt->pntsw);
	if (lt->editlatt) {
		Lattice *editlt= lt->editlatt->latt;

		if (editlt->def) MEM_freeN(editlt->def);
		if (editlt->dvert) free_dverts(editlt->dvert, lt->pntsu*lt->pntsv*lt->pntsw);

		MEM_freeN(editlt);
		MEM_freeN(lt->editlatt);
	}
	
	/* free animation data */
	if (lt->adt) {
		BKE_free_animdata(&lt->id);
		lt->adt= NULL;
	}
}


void make_local_lattice(Lattice *lt)
{
	Main *bmain= G.main;
	Object *ob;
	int is_local= FALSE, is_lib= FALSE;

	/* - only lib users: do nothing
	 * - only local users: set flag
	 * - mixed: make copy
	 */
	
	if (lt->id.lib==NULL) return;
	if (lt->id.us==1) {
		id_clear_lib_data(bmain, &lt->id);
		return;
	}
	
	for (ob= bmain->object.first; ob && ELEM(FALSE, is_lib, is_local); ob= ob->id.next) {
		if (ob->data==lt) {
			if (ob->id.lib) is_lib= TRUE;
			else is_local= TRUE;
		}
	}
	
	if (is_local && is_lib==FALSE) {
		id_clear_lib_data(bmain, &lt->id);
	}
	else if (is_local && is_lib) {
		Lattice *lt_new= copy_lattice(lt);
		lt_new->id.us= 0;

		/* Remap paths of new ID using old library as base. */
		BKE_id_lib_local_paths(bmain, lt->id.lib, &lt_new->id);

		for (ob= bmain->object.first; ob; ob= ob->id.next) {
			if (ob->data==lt) {
				if (ob->id.lib==NULL) {
					ob->data= lt_new;
					lt_new->id.us++;
					lt->id.us--;
				}
			}
		}
	}
}

void init_latt_deform(Object *oblatt, Object *ob)
{
		/* we make an array with all differences */
	Lattice *lt= oblatt->data;
	BPoint *bp;
	DispList *dl = find_displist(&oblatt->disp, DL_VERTS);
	float *co = dl?dl->verts:NULL;
	float *fp, imat[4][4];
	float fu, fv, fw;
	int u, v, w;

	if (lt->editlatt) lt= lt->editlatt->latt;
	bp = lt->def;
	
	fp= lt->latticedata= MEM_mallocN(sizeof(float)*3*lt->pntsu*lt->pntsv*lt->pntsw, "latticedata");
	
		/* for example with a particle system: ob==0 */
	if (ob==NULL) {
		/* in deformspace, calc matrix  */
		invert_m4_m4(lt->latmat, oblatt->obmat);
	
		/* back: put in deform array */
		invert_m4_m4(imat, lt->latmat);
	}
	else {
		/* in deformspace, calc matrix */
		invert_m4_m4(imat, oblatt->obmat);
		mult_m4_m4m4(lt->latmat, imat, ob->obmat);
	
		/* back: put in deform array */
		invert_m4_m4(imat, lt->latmat);
	}
	
	for (w=0,fw=lt->fw; w<lt->pntsw; w++,fw+=lt->dw) {
		for (v=0,fv=lt->fv; v<lt->pntsv; v++, fv+=lt->dv) {
			for (u=0,fu=lt->fu; u<lt->pntsu; u++, bp++, co+=3, fp+=3, fu+=lt->du) {
				if (dl) {
					fp[0] = co[0] - fu;
					fp[1] = co[1] - fv;
					fp[2] = co[2] - fw;
				}
				else {
					fp[0] = bp->vec[0] - fu;
					fp[1] = bp->vec[1] - fv;
					fp[2] = bp->vec[2] - fw;
				}

				mul_mat3_m4_v3(imat, fp);
			}
		}
	}
}

void calc_latt_deform(Object *ob, float co[3], float weight)
{
	Lattice *lt= ob->data;
	float u, v, w, tu[4], tv[4], tw[4];
	float vec[3];
	int idx_w, idx_v, idx_u;
	int ui, vi, wi, uu, vv, ww;

	/* vgroup influence */
	int defgroup_nr= -1;
	float co_prev[3], weight_blend= 0.0f;
	MDeformVert *dvert= lattice_get_deform_verts(ob);


	if (lt->editlatt) lt= lt->editlatt->latt;
	if (lt->latticedata==NULL) return;

	if (lt->vgroup[0] && dvert) {
		defgroup_nr= defgroup_name_index(ob, lt->vgroup);
		copy_v3_v3(co_prev, co);
	}

	/* co is in local coords, treat with latmat */
	mul_v3_m4v3(vec, lt->latmat, co);

	/* u v w coords */

	if (lt->pntsu>1) {
		u= (vec[0]-lt->fu)/lt->du;
		ui= (int)floor(u);
		u -= ui;
		key_curve_position_weights(u, tu, lt->typeu);
	}
	else {
		tu[0]= tu[2]= tu[3]= 0.0; tu[1]= 1.0;
		ui= 0;
	}

	if (lt->pntsv>1) {
		v= (vec[1]-lt->fv)/lt->dv;
		vi= (int)floor(v);
		v -= vi;
		key_curve_position_weights(v, tv, lt->typev);
	}
	else {
		tv[0]= tv[2]= tv[3]= 0.0; tv[1]= 1.0;
		vi= 0;
	}

	if (lt->pntsw>1) {
		w= (vec[2]-lt->fw)/lt->dw;
		wi= (int)floor(w);
		w -= wi;
		key_curve_position_weights(w, tw, lt->typew);
	}
	else {
		tw[0]= tw[2]= tw[3]= 0.0; tw[1]= 1.0;
		wi= 0;
	}

	for (ww= wi-1; ww<=wi+2; ww++) {
		w= tw[ww-wi+1];

		if (w != 0.0f) {
			if (ww>0) {
				if (ww<lt->pntsw) idx_w= ww*lt->pntsu*lt->pntsv;
				else idx_w= (lt->pntsw-1)*lt->pntsu*lt->pntsv;
			}
			else idx_w= 0;

			for (vv= vi-1; vv<=vi+2; vv++) {
				v= w*tv[vv-vi+1];

				if (v != 0.0f) {
					if (vv>0) {
						if (vv<lt->pntsv) idx_v= idx_w + vv*lt->pntsu;
						else idx_v= idx_w + (lt->pntsv-1)*lt->pntsu;
					}
					else idx_v= idx_w;

					for (uu= ui-1; uu<=ui+2; uu++) {
						u= weight*v*tu[uu-ui+1];

						if (u != 0.0f) {
							if (uu>0) {
								if (uu<lt->pntsu) idx_u= idx_v + uu;
								else idx_u= idx_v + (lt->pntsu-1);
							}
							else idx_u= idx_v;

							madd_v3_v3fl(co, &lt->latticedata[idx_u * 3], u);

							if (defgroup_nr != -1)
								weight_blend += (u * defvert_find_weight(dvert + idx_u, defgroup_nr));
						}
					}
				}
			}
		}
	}

	if (defgroup_nr != -1)
		interp_v3_v3v3(co, co_prev, co, weight_blend);

}

void end_latt_deform(Object *ob)
{
	Lattice *lt= ob->data;
	
	if (lt->editlatt) lt= lt->editlatt->latt;
	
	if (lt->latticedata)
		MEM_freeN(lt->latticedata);
	lt->latticedata= NULL;
}

	/* calculations is in local space of deformed object
	 * so we store in latmat transform from path coord inside object 
	 */
typedef struct {
	float dmin[3], dmax[3];
	float curvespace[4][4], objectspace[4][4], objectspace3[3][3];
	int no_rot_axis;
} CurveDeform;

static void init_curve_deform(Object *par, Object *ob, CurveDeform *cd)
{
	invert_m4_m4(ob->imat, ob->obmat);
	mult_m4_m4m4(cd->objectspace, ob->imat, par->obmat);
	invert_m4_m4(cd->curvespace, cd->objectspace);
	copy_m3_m4(cd->objectspace3, cd->objectspace);
	cd->no_rot_axis= 0;
}

/* this makes sure we can extend for non-cyclic.
 *
 * returns OK: 1/0
 */
static int where_on_path_deform(Object *ob, float ctime, float vec[4], float dir[3], float quat[4], float *radius)
{
	Curve *cu= ob->data;
	BevList *bl;
	float ctime1;
	int cycl=0;
	
	/* test for cyclic */
	bl= cu->bev.first;
	if (!bl->nr) return 0;
	if (bl && bl->poly> -1) cycl= 1;

	if (cycl==0) {
		ctime1= CLAMPIS(ctime, 0.0f, 1.0f);
	}
	else ctime1= ctime;
	
	/* vec needs 4 items */
	if (where_on_path(ob, ctime1, vec, dir, quat, radius, NULL)) {
		
		if (cycl==0) {
			Path *path= cu->path;
			float dvec[3];
			
			if (ctime < 0.0f) {
				sub_v3_v3v3(dvec, path->data[1].vec, path->data[0].vec);
				mul_v3_fl(dvec, ctime*(float)path->len);
				add_v3_v3(vec, dvec);
				if (quat) copy_qt_qt(quat, path->data[0].quat);
				if (radius) *radius= path->data[0].radius;
			}
			else if (ctime > 1.0f) {
				sub_v3_v3v3(dvec, path->data[path->len-1].vec, path->data[path->len-2].vec);
				mul_v3_fl(dvec, (ctime-1.0f)*(float)path->len);
				add_v3_v3(vec, dvec);
				if (quat) copy_qt_qt(quat, path->data[path->len-1].quat);
				if (radius) *radius= path->data[path->len-1].radius;
				/* weight - not used but could be added */
			}
		}
		return 1;
	}
	return 0;
}

/* for each point, rotate & translate to curve */
/* use path, since it has constant distances */
/* co: local coord, result local too */
/* returns quaternion for rotation, using cd->no_rot_axis */
/* axis is using another define!!! */
static int calc_curve_deform(Scene *scene, Object *par, float co[3],
                             const short axis, CurveDeform *cd, float quat_r[4])
{
	Curve *cu= par->data;
	float fac, loc[4], dir[3], new_quat[4], radius;
	short index;
	const int is_neg_axis = (axis > 2);

	/* to be sure, mostly after file load */
	if (cu->path==NULL) {
		makeDispListCurveTypes(scene, par, 0);
		if (cu->path==NULL) return 0;	// happens on append...
	}
	
	/* options */
	if (is_neg_axis) {
		index = axis - 3;
		if (cu->flag & CU_STRETCH)
			fac= (-co[index]-cd->dmax[index])/(cd->dmax[index] - cd->dmin[index]);
		else
			fac= - (co[index]-cd->dmax[index])/(cu->path->totdist);
	}
	else {
		index = axis;
		if (cu->flag & CU_STRETCH)
			fac= (co[index]-cd->dmin[index])/(cd->dmax[index] - cd->dmin[index]);
		else
			fac= + (co[index]-cd->dmin[index])/(cu->path->totdist);
	}
	
	if ( where_on_path_deform(par, fac, loc, dir, new_quat, &radius)) {	/* returns OK */
		float quat[4], cent[3];

		if (cd->no_rot_axis) {	/* set by caller */

			/* this is not exactly the same as 2.4x, since the axis is having rotation removed rather than
			 * changing the axis before calculating the tilt but serves much the same purpose */
			float dir_flat[3]={0,0,0}, q[4];
			copy_v3_v3(dir_flat, dir);
			dir_flat[cd->no_rot_axis-1]= 0.0f;

			normalize_v3(dir);
			normalize_v3(dir_flat);

			rotation_between_vecs_to_quat(q, dir, dir_flat); /* Could this be done faster? */

			mul_qt_qtqt(new_quat, q, new_quat);
		}


		/* Logic for 'cent' orientation *
		 *
		 * The way 'co' is copied to 'cent' may seem to have no meaning, but it does.
		 *
		 * Use a curve modifier to stretch a cube out, color each side RGB, positive side light, negative dark.
		 * view with X up (default), from the angle that you can see 3 faces RGB colors (light), anti-clockwise
		 * Notice X,Y,Z Up all have light colors and each ordered CCW.
		 *
		 * Now for Neg Up XYZ, the colors are all dark, and ordered clockwise - Campbell
		 *
		 * note: moved functions into quat_apply_track/vec_apply_track
		 * */
		copy_qt_qt(quat, new_quat);
		copy_v3_v3(cent, co);

		/* zero the axis which is not used,
		 * the big block of text above now applies to these 3 lines */
		quat_apply_track(quat, axis, (axis == 0 || axis == 2) ? 1:0); /* up flag is a dummy, set so no rotation is done */
		vec_apply_track(cent, axis);
		cent[index]= 0.0f;


		/* scale if enabled */
		if (cu->flag & CU_PATH_RADIUS)
			mul_v3_fl(cent, radius);
		
		/* local rotation */
		normalize_qt(quat);
		mul_qt_v3(quat, cent);

		/* translation */
		add_v3_v3v3(co, cent, loc);

		if (quat_r)
			copy_qt_qt(quat_r, quat);

		return 1;
	}
	return 0;
}

void curve_deform_verts(Scene *scene, Object *cuOb, Object *target,
                        DerivedMesh *dm, float (*vertexCos)[3],
                        int numVerts, const char *vgroup, short defaxis)
{
	Curve *cu;
	int a, flag;
	CurveDeform cd;
	int use_vgroups;
	const int is_neg_axis = (defaxis > 2);

	if (cuOb->type != OB_CURVE)
		return;

	cu = cuOb->data;
	flag = cu->flag;
	cu->flag |= (CU_PATH|CU_FOLLOW); // needed for path & bevlist

	init_curve_deform(cuOb, target, &cd);

	/* dummy bounds, keep if CU_DEFORM_BOUNDS_OFF is set */
	if (is_neg_axis == FALSE) {
		cd.dmin[0]= cd.dmin[1]= cd.dmin[2]= 0.0f;
		cd.dmax[0]= cd.dmax[1]= cd.dmax[2]= 1.0f;
	}
	else {
		/* negative, these bounds give a good rest position */
		cd.dmin[0]= cd.dmin[1]= cd.dmin[2]= -1.0f;
		cd.dmax[0]= cd.dmax[1]= cd.dmax[2]=  0.0f;
	}
	
	/* check whether to use vertex groups (only possible if target is a Mesh)
	 * we want either a Mesh with no derived data, or derived data with
	 * deformverts
	 */
	if (target && target->type==OB_MESH) {
		/* if there's derived data without deformverts, don't use vgroups */
		if (dm && !dm->getVertData(dm, 0, CD_MDEFORMVERT))
			use_vgroups = 0;
		else
			use_vgroups = 1;
	}
	else {
		use_vgroups = 0;
	}
	
	if (vgroup && vgroup[0] && use_vgroups) {
		Mesh *me= target->data;
		int index= defgroup_name_index(target, vgroup);

		if (index != -1 && (me->dvert || dm)) {
			MDeformVert *dvert = me->dvert;
			float vec[3];
			float weight;
	

			if (cu->flag & CU_DEFORM_BOUNDS_OFF) {
				dvert = me->dvert;
				for (a = 0; a < numVerts; a++, dvert++) {
					if (dm) dvert = dm->getVertData(dm, a, CD_MDEFORMVERT);
					weight= defvert_find_weight(dvert, index);
	
					if (weight > 0.0f) {
						mul_m4_v3(cd.curvespace, vertexCos[a]);
						copy_v3_v3(vec, vertexCos[a]);
						calc_curve_deform(scene, cuOb, vec, defaxis, &cd, NULL);
						interp_v3_v3v3(vertexCos[a], vertexCos[a], vec, weight);
						mul_m4_v3(cd.objectspace, vertexCos[a]);
					}
				}
			}
			else {
				/* set mesh min/max bounds */
				INIT_MINMAX(cd.dmin, cd.dmax);
	
				for (a = 0; a < numVerts; a++, dvert++) {
					if (dm) dvert = dm->getVertData(dm, a, CD_MDEFORMVERT);
					
					if (defvert_find_weight(dvert, index) > 0.0f) {
						mul_m4_v3(cd.curvespace, vertexCos[a]);
						DO_MINMAX(vertexCos[a], cd.dmin, cd.dmax);
					}
				}
	
				dvert = me->dvert;
				for (a = 0; a < numVerts; a++, dvert++) {
					if (dm) dvert = dm->getVertData(dm, a, CD_MDEFORMVERT);
					
					weight= defvert_find_weight(dvert, index);
	
					if (weight > 0.0f) {
						/* already in 'cd.curvespace', prev for loop */
						copy_v3_v3(vec, vertexCos[a]);
						calc_curve_deform(scene, cuOb, vec, defaxis, &cd, NULL);
						interp_v3_v3v3(vertexCos[a], vertexCos[a], vec, weight);
						mul_m4_v3(cd.objectspace, vertexCos[a]);
					}
				}
			}
		}
	}
	else {
		if (cu->flag & CU_DEFORM_BOUNDS_OFF) {
			for (a = 0; a < numVerts; a++) {
				mul_m4_v3(cd.curvespace, vertexCos[a]);
				calc_curve_deform(scene, cuOb, vertexCos[a], defaxis, &cd, NULL);
				mul_m4_v3(cd.objectspace, vertexCos[a]);
			}
		}
		else {
			/* set mesh min max bounds */
			INIT_MINMAX(cd.dmin, cd.dmax);
				
			for (a = 0; a < numVerts; a++) {
				mul_m4_v3(cd.curvespace, vertexCos[a]);
				DO_MINMAX(vertexCos[a], cd.dmin, cd.dmax);
			}
	
			for (a = 0; a < numVerts; a++) {
				/* already in 'cd.curvespace', prev for loop */
				calc_curve_deform(scene, cuOb, vertexCos[a], defaxis, &cd, NULL);
				mul_m4_v3(cd.objectspace, vertexCos[a]);
			}
		}
	}
	cu->flag = flag;
}

/* input vec and orco = local coord in armature space */
/* orco is original not-animated or deformed reference point */
/* result written in vec and mat */
void curve_deform_vector(Scene *scene, Object *cuOb, Object *target,
                         float orco[3], float vec[3], float mat[][3], int no_rot_axis)
{
	CurveDeform cd;
	float quat[4];
	
	if (cuOb->type != OB_CURVE) {
		unit_m3(mat);
		return;
	}

	init_curve_deform(cuOb, target, &cd);
	cd.no_rot_axis= no_rot_axis;				/* option to only rotate for XY, for example */
	
	copy_v3_v3(cd.dmin, orco);
	copy_v3_v3(cd.dmax, orco);

	mul_m4_v3(cd.curvespace, vec);
	
	if (calc_curve_deform(scene, cuOb, vec, target->trackflag, &cd, quat)) {
		float qmat[3][3];
		
		quat_to_mat3( qmat,quat);
		mul_m3_m3m3(mat, qmat, cd.objectspace3);
	}
	else
		unit_m3(mat);
	
	mul_m4_v3(cd.objectspace, vec);

}

void lattice_deform_verts(Object *laOb, Object *target, DerivedMesh *dm,
                          float (*vertexCos)[3], int numVerts, const char *vgroup, float fac)
{
	int a;
	int use_vgroups;

	if (laOb->type != OB_LATTICE)
		return;

	init_latt_deform(laOb, target);

	/* check whether to use vertex groups (only possible if target is a Mesh)
	 * we want either a Mesh with no derived data, or derived data with
	 * deformverts
	 */
	if (target && target->type==OB_MESH) {
		/* if there's derived data without deformverts, don't use vgroups */
		if (dm && !dm->getVertData(dm, 0, CD_MDEFORMVERT))
			use_vgroups = 0;
		else
			use_vgroups = 1;
	}
	else {
		use_vgroups = 0;
	}
	
	if (vgroup && vgroup[0] && use_vgroups) {
		Mesh *me = target->data;
		int index = defgroup_name_index(target, vgroup);
		float weight;

		if (index >= 0 && (me->dvert || dm)) {
			MDeformVert *dvert = me->dvert;
			
			for (a = 0; a < numVerts; a++, dvert++) {
				if (dm) dvert = dm->getVertData(dm, a, CD_MDEFORMVERT);

				weight= defvert_find_weight(dvert, index);

				if (weight > 0.0f)
					calc_latt_deform(laOb, vertexCos[a], weight * fac);
			}
		}
	}
	else {
		for (a = 0; a < numVerts; a++) {
			calc_latt_deform(laOb, vertexCos[a], fac);
		}
	}
	end_latt_deform(laOb);
}

int object_deform_mball(Object *ob, ListBase *dispbase)
{
	if (ob->parent && ob->parent->type==OB_LATTICE && ob->partype==PARSKEL) {
		DispList *dl;

		for (dl=dispbase->first; dl; dl=dl->next) {
			lattice_deform_verts(ob->parent, ob, NULL,
								 (float(*)[3]) dl->verts, dl->nr, NULL, 1.0f);
		}

		return 1;
	}
	else {
		return 0;
	}
}

static BPoint *latt_bp(Lattice *lt, int u, int v, int w)
{
	return &lt->def[LT_INDEX(lt, u, v, w)];
}

void outside_lattice(Lattice *lt)
{
	BPoint *bp, *bp1, *bp2;
	int u, v, w;
	float fac1, du=0.0, dv=0.0, dw=0.0;

	if (lt->flag & LT_OUTSIDE) {
		bp= lt->def;

		if (lt->pntsu>1) du= 1.0f/((float)lt->pntsu-1);
		if (lt->pntsv>1) dv= 1.0f/((float)lt->pntsv-1);
		if (lt->pntsw>1) dw= 1.0f/((float)lt->pntsw-1);
			
		for (w=0; w<lt->pntsw; w++) {
			
			for (v=0; v<lt->pntsv; v++) {
			
				for (u=0; u<lt->pntsu; u++, bp++) {
					if (u==0 || v==0 || w==0 || u==lt->pntsu-1 || v==lt->pntsv-1 || w==lt->pntsw-1);
					else {
					
						bp->hide= 1;
						bp->f1 &= ~SELECT;
						
						/* u extrema */
						bp1= latt_bp(lt, 0, v, w);
						bp2= latt_bp(lt, lt->pntsu-1, v, w);
						
						fac1= du*u;
						bp->vec[0]= (1.0f-fac1)*bp1->vec[0] + fac1*bp2->vec[0];
						bp->vec[1]= (1.0f-fac1)*bp1->vec[1] + fac1*bp2->vec[1];
						bp->vec[2]= (1.0f-fac1)*bp1->vec[2] + fac1*bp2->vec[2];
						
						/* v extrema */
						bp1= latt_bp(lt, u, 0, w);
						bp2= latt_bp(lt, u, lt->pntsv-1, w);
						
						fac1= dv*v;
						bp->vec[0]+= (1.0f-fac1)*bp1->vec[0] + fac1*bp2->vec[0];
						bp->vec[1]+= (1.0f-fac1)*bp1->vec[1] + fac1*bp2->vec[1];
						bp->vec[2]+= (1.0f-fac1)*bp1->vec[2] + fac1*bp2->vec[2];
						
						/* w extrema */
						bp1= latt_bp(lt, u, v, 0);
						bp2= latt_bp(lt, u, v, lt->pntsw-1);
						
						fac1= dw*w;
						bp->vec[0]+= (1.0f-fac1)*bp1->vec[0] + fac1*bp2->vec[0];
						bp->vec[1]+= (1.0f-fac1)*bp1->vec[1] + fac1*bp2->vec[1];
						bp->vec[2]+= (1.0f-fac1)*bp1->vec[2] + fac1*bp2->vec[2];
						
						mul_v3_fl(bp->vec, 0.3333333f);
						
					}
				}
				
			}
			
		}
	}
	else {
		bp= lt->def;

		for (w=0; w<lt->pntsw; w++)
			for (v=0; v<lt->pntsv; v++)
				for (u=0; u<lt->pntsu; u++, bp++)
					bp->hide= 0;
	}
}

float (*lattice_getVertexCos(struct Object *ob, int *numVerts_r))[3]
{
	Lattice *lt = ob->data;
	int i, numVerts;
	float (*vertexCos)[3];

	if (lt->editlatt) lt= lt->editlatt->latt;
	numVerts = *numVerts_r = lt->pntsu*lt->pntsv*lt->pntsw;
	
	vertexCos = MEM_mallocN(sizeof(*vertexCos)*numVerts,"lt_vcos");
	
	for (i=0; i<numVerts; i++) {
		copy_v3_v3(vertexCos[i], lt->def[i].vec);
	}

	return vertexCos;
}

void lattice_applyVertexCos(struct Object *ob, float (*vertexCos)[3])
{
	Lattice *lt = ob->data;
	int i, numVerts = lt->pntsu*lt->pntsv*lt->pntsw;

	for (i=0; i<numVerts; i++) {
		copy_v3_v3(lt->def[i].vec, vertexCos[i]);
	}
}

void lattice_calc_modifiers(Scene *scene, Object *ob)
{
	Lattice *lt= ob->data;
	ModifierData *md = modifiers_getVirtualModifierList(ob);
	float (*vertexCos)[3] = NULL;
	int numVerts, editmode = (lt->editlatt!=NULL);

	freedisplist(&ob->disp);

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

		md->scene= scene;
		
		if (!(md->mode&eModifierMode_Realtime)) continue;
		if (editmode && !(md->mode&eModifierMode_Editmode)) continue;
		if (mti->isDisabled && mti->isDisabled(md, 0)) continue;
		if (mti->type!=eModifierTypeType_OnlyDeform) continue;

		if (!vertexCos) vertexCos = lattice_getVertexCos(ob, &numVerts);
		mti->deformVerts(md, ob, NULL, vertexCos, numVerts, 0, 0);
	}

	/* always displist to make this work like derivedmesh */
	if (!vertexCos) vertexCos = lattice_getVertexCos(ob, &numVerts);
	
	{
		DispList *dl = MEM_callocN(sizeof(*dl), "lt_dl");
		dl->type = DL_VERTS;
		dl->parts = 1;
		dl->nr = numVerts;
		dl->verts = (float*) vertexCos;
		
		BLI_addtail(&ob->disp, dl);
	}
}

struct MDeformVert* lattice_get_deform_verts(struct Object *oblatt)
{
	Lattice *lt = (Lattice*)oblatt->data;
	BLI_assert(oblatt->type == OB_LATTICE);
	if (lt->editlatt) lt= lt->editlatt->latt;
	return lt->dvert;
}