Mesh Deform Modifier: compress static binding weights better, threshold

is still set very low so in many cases it could be even smaller, but being
a bit conservative here to try to avoid breaking rigs.

This is not forward-compatible, i.e. loading new files in older blender
versions will loose the binding.

source/blender/blenkernel/BKE_modifier.h

@@ -321,5 +321,8 @@ struct LinkNode *modifiers_calcDataMasks(struct Scene *scene,
 										 int required_mode);
 struct ModifierData  *modifiers_getVirtualModifierList(struct Object *ob);
 
+/* here for do_versions */
+void modifier_mdef_compact_influences(struct ModifierData *md);
+
 #endif
 

source/blender/blenloader/intern/readfile.c

@@ -3852,24 +3852,35 @@ static void direct_link_modifiers(FileData *fd, ListBase *lb)
 		else if (md->type==eModifierType_MeshDeform) {
 			MeshDeformModifierData *mmd = (MeshDeformModifierData*) md;
 
-			mmd->bindweights= newdataadr(fd, mmd->bindweights);
-			mmd->bindcos= newdataadr(fd, mmd->bindcos);
+			mmd->bindinfluences= newdataadr(fd, mmd->bindinfluences);
+			mmd->bindoffsets= newdataadr(fd, mmd->bindoffsets);
+			mmd->bindcagecos= newdataadr(fd, mmd->bindcagecos);
 			mmd->dyngrid= newdataadr(fd, mmd->dyngrid);
 			mmd->dyninfluences= newdataadr(fd, mmd->dyninfluences);
 			mmd->dynverts= newdataadr(fd, mmd->dynverts);
 
+			mmd->bindweights= newdataadr(fd, mmd->bindweights);
+			mmd->bindcos= newdataadr(fd, mmd->bindcos);
+
 			if(fd->flags & FD_FLAGS_SWITCH_ENDIAN) {
 				int a;
 
+				if(mmd->bindoffsets)
+					for(a=0; a<mmd->totvert+1; a++)
+						SWITCH_INT(mmd->bindoffsets[a])
+				if(mmd->bindcagecos)
+					for(a=0; a<mmd->totcagevert*3; a++)
+						SWITCH_INT(mmd->bindcagecos[a])
+				if(mmd->dynverts)
+					for(a=0; a<mmd->totvert; a++)
+						SWITCH_INT(mmd->dynverts[a])
+
 				if(mmd->bindweights)
 					for(a=0; a<mmd->totcagevert*mmd->totvert; a++)
 						SWITCH_INT(mmd->bindweights[a])
 				if(mmd->bindcos)
 					for(a=0; a<mmd->totcagevert*3; a++)
 						SWITCH_INT(mmd->bindcos[a])
-				if(mmd->dynverts)
-					for(a=0; a<mmd->totvert; a++)
-						SWITCH_INT(mmd->dynverts[a])
 			}
 		}
 	}
@@ -5169,7 +5180,7 @@ static void direct_link_screen(FileData *fd, bScreen *sc)
 				/*comma expressions, (e.g. expr1, expr2, expr3) evalutate each expression,
 				  from left to right.  the right-most expression sets the result of the comma
 				  expression as a whole*/
-				for(cl= sconsole->history.first; cl && (clnext=cl->next), cl; cl= clnext) {
+				for(cl= sconsole->history.first; cl && (clnext=cl->next); cl= clnext) {
 					cl->line= newdataadr(fd, cl->line);
 					if (!cl->line) {
 						BLI_remlink(&sconsole->history, cl);
@@ -6451,6 +6462,30 @@ static void do_version_mtex_factor_2_50(MTex **mtex_array, short idtype)
 	}
 }
 
+static void do_version_mdef_250(FileData *fd, Library *lib, Main *main)
+{
+	Object *ob;
+	ModifierData *md;
+	MeshDeformModifierData *mmd;
+
+	for(ob= main->object.first; ob; ob=ob->id.next) {
+		for(md=ob->modifiers.first; md; md=md->next) {
+			if(md->type == eModifierType_MeshDeform) {
+				mmd= (MeshDeformModifierData*)md;
+
+				if(mmd->bindcos) {
+					/* make bindcos NULL in order to trick older versions
+					   into thinking that the mesh was not bound yet */
+					mmd->bindcagecos= mmd->bindcos;
+					mmd->bindcos= NULL;
+
+					modifier_mdef_compact_influences(md);
+				}
+			}
+		}
+	}
+}
+
 static void do_version_constraints_radians_degrees_250(ListBase *lb)
 {
 	bConstraint *con;
@@ -10780,7 +10815,7 @@ static void do_versions(FileData *fd, Library *lib, Main *main)
 	
 	/* put 2.50 compatibility code here until next subversion bump */
 	{
-		
+		do_version_mdef_250(fd, lib, main);
 	}
 
 	/* WATCH IT!!!: pointers from libdata have not been converted yet here! */
@@ -12219,8 +12254,8 @@ static void read_libraries(FileData *basefd, ListBase *mainlist)
 							printf("	absolute lib: %s\n", mainptr->curlib->filename);
 							printf("	relative lib: %s\n", mainptr->curlib->name);
 							printf("  enter a new path:\n");
-							scanf("%s", newlib_path);
 
+							if(scanf("%s", newlib_path) > 0) {
 								strcpy(mainptr->curlib->name, newlib_path);
 								strcpy(mainptr->curlib->filename, newlib_path);
 								cleanup_path(G.sce, mainptr->curlib->filename);
@@ -12232,6 +12267,7 @@ static void read_libraries(FileData *basefd, ListBase *mainlist)
 								}
 							}
 						}
+					}
 
 					if (fd) {
 						fd->reports= basefd->reports;

source/blender/editors/armature/meshlaplacian.c

@@ -44,6 +44,7 @@
 #include "BLI_memarena.h"
 
 #include "BKE_DerivedMesh.h"
+#include "BKE_modifier.h"
 #include "BKE_utildefines.h"
 
 #ifdef RIGID_DEFORM
@@ -1991,19 +1992,22 @@ void mesh_deform_bind(Scene *scene, DerivedMesh *dm, MeshDeformModifierData *mmd
 #endif
 
 	/* assign bind variables */
-	mmd->bindcos= (float*)mdb.cagecos;
+	mmd->bindcagecos= (float*)mdb.cagecos;
 	mmd->totvert= mdb.totvert;
 	mmd->totcagevert= mdb.totcagevert;
 	copy_m4_m4(mmd->bindmat, mmd->object->obmat);
 
-	/* transform bindcos to world space */
+	/* transform bindcagecos to world space */
 	for(a=0; a<mdb.totcagevert; a++)
-		mul_m4_v3(mmd->object->obmat, mmd->bindcos+a*3);
+		mul_m4_v3(mmd->object->obmat, mmd->bindcagecos+a*3);
 
 	/* free */
 	mdb.cagedm->release(mdb.cagedm);
 	MEM_freeN(mdb.vertexcos);
 
+	/* compact weights */
+	modifier_mdef_compact_influences((ModifierData*)mmd);
+
 	end_progress_bar();
 	waitcursor(0);
 }

source/blender/makesdna/DNA_modifier_types.h

@@ -516,9 +516,13 @@ typedef struct MeshDeformModifierData {
 
 	short gridsize, flag, mode, pad;
 
-	/* variables filled in when bound */
-	float *bindweights, *bindcos;	/* computed binding weights */
+	/* result of static binding */
+	MDefInfluence *bindinfluences;	/* influences */
+	int *bindoffsets;				/* offsets into influences array */
+	float *bindcagecos;				/* coordinates that cage was bound with */
 	int totvert, totcagevert;		/* total vertices in mesh and cage */
+
+	/* result of dynamic binding */
 	MDefCell *dyngrid;				/* grid with dynamic binding cell points */
 	MDefInfluence *dyninfluences;	/* dynamic binding vertex influences */
 	int *dynverts, *pad2;			/* is this vertex bound or not? */
@@ -528,6 +532,10 @@ typedef struct MeshDeformModifierData {
 	float dyncellwidth;				/* width of dynamic bind cell */
 	float bindmat[4][4];			/* matrix of cage at binding time */
 
+	/* deprecated storage */
+	float *bindweights;				/* deprecated inefficient storage */
+	float *bindcos;					/* deprecated storage of cage coords */
+
 	/* runtime */
 	void (*bindfunc)(struct Scene *scene, struct DerivedMesh *dm,
 		struct MeshDeformModifierData *mmd,

source/blender/modifiers/intern/MOD_meshdeform.c

@@ -58,8 +58,9 @@ static void freeData(ModifierData *md)
 {
 	MeshDeformModifierData *mmd = (MeshDeformModifierData*) md;
 
-	if(mmd->bindweights) MEM_freeN(mmd->bindweights);
-	if(mmd->bindcos) MEM_freeN(mmd->bindcos);
+	if(mmd->bindinfluences) MEM_freeN(mmd->bindinfluences);
+	if(mmd->bindoffsets) MEM_freeN(mmd->bindoffsets);
+	if(mmd->bindcagecos) MEM_freeN(mmd->bindcagecos);
 	if(mmd->dyngrid) MEM_freeN(mmd->dyngrid);
 	if(mmd->dyninfluences) MEM_freeN(mmd->dyninfluences);
 	if(mmd->dynverts) MEM_freeN(mmd->dynverts);
@@ -180,11 +181,13 @@ static void meshdeformModifier_do(
 	MDeformVert *dvert = NULL;
 	MDeformWeight *dw;
 	MVert *cagemvert;
+	MDefInfluence *influences;
+	int *offsets;
 	float imat[4][4], cagemat[4][4], iobmat[4][4], icagemat[3][3], cmat[4][4];
-	float weight, totweight, fac, co[3], *weights, (*dco)[3], (*bindcos)[3];
+	float weight, totweight, fac, co[3], (*dco)[3], (*bindcagecos)[3];
 	int a, b, totvert, totcagevert, defgrp_index;
 	
-	if(!mmd->object || (!mmd->bindcos && !mmd->bindfunc))
+	if(!mmd->object || (!mmd->bindcagecos && !mmd->bindfunc))
 		return;
 	
 	/* get cage derivedmesh */
@@ -216,7 +219,7 @@ static void meshdeformModifier_do(
 	copy_m3_m4(icagemat, iobmat);
 
 	/* bind weights if needed */
-	if(!mmd->bindcos) {
+	if(!mmd->bindcagecos) {
 		static int recursive = 0;
 
 		/* progress bar redraw can make this recursive .. */
@@ -231,15 +234,16 @@ static void meshdeformModifier_do(
 	totvert= numVerts;
 	totcagevert= cagedm->getNumVerts(cagedm);
 
-	if(mmd->totvert!=totvert || mmd->totcagevert!=totcagevert || !mmd->bindcos) {
+	if(mmd->totvert!=totvert || mmd->totcagevert!=totcagevert || !mmd->bindcagecos) {
 		cagedm->release(cagedm);
 		return;
 	}
 	
 	/* setup deformation data */
 	cagemvert= cagedm->getVertArray(cagedm);
-	weights= mmd->bindweights;
-	bindcos= (float(*)[3])mmd->bindcos;
+	influences= mmd->bindinfluences;
+	offsets= mmd->bindoffsets;
+	bindcagecos= (float(*)[3])mmd->bindcagecos;
 
 	dco= MEM_callocN(sizeof(*dco)*totcagevert, "MDefDco");
 	for(a=0; a<totcagevert; a++) {
@@ -249,7 +253,7 @@ static void meshdeformModifier_do(
 		if(G.rt != 527) {
 			mul_m4_v3(mmd->bindmat, co);
 			/* compute difference with world space bind coord */
-			sub_v3_v3v3(dco[a], co, bindcos[a]);
+			sub_v3_v3v3(dco[a], co, bindcagecos[a]);
 		}
 		else
 			copy_v3_v3(dco[a], co);
@@ -296,9 +300,9 @@ static void meshdeformModifier_do(
 			totweight= 0.0f;
 			co[0]= co[1]= co[2]= 0.0f;
 
-			for(a=0; a<totcagevert; a++) {
-				weight= weights[a + b*totcagevert];
-				madd_v3_v3fl(co, dco[a], weight);
+			for(a=offsets[b]; a<offsets[b+1]; a++) {
+				weight= influences[a].weight;
+				madd_v3_v3fl(co, dco[influences[a].vertex], weight);
 				totweight += weight;
 			}
 		}
@@ -352,6 +356,68 @@ static void deformVertsEM(
 		dm->release(dm);
 }
 
+#define MESHDEFORM_MIN_INFLUENCE 0.00001
+
+void modifier_mdef_compact_influences(ModifierData *md)
+{
+	MeshDeformModifierData *mmd= (MeshDeformModifierData*)md;
+	float weight, *weights, totweight;
+	int totinfluence, totvert, totcagevert, a, b;
+
+	weights= mmd->bindweights;
+	if(!weights)
+		return;
+	
+	totvert= mmd->totvert;
+	totcagevert= mmd->totcagevert;
+
+	/* count number of influences above threshold */
+	for(b=0; b<totvert; b++) {
+		for(a=0; a<totcagevert; a++) {
+			weight= weights[a + b*totcagevert];
+
+			if(weight > MESHDEFORM_MIN_INFLUENCE)
+				mmd->totinfluence++;
+		}
+	}
+
+	/* allocate bind influences */
+	mmd->bindinfluences= MEM_callocN(sizeof(MDefInfluence)*mmd->totinfluence, "MDefBindInfluence");
+	mmd->bindoffsets= MEM_callocN(sizeof(int)*(totvert+1), "MDefBindOffset");
+
+	/* write influences */
+	totinfluence= 0;
+
+	for(b=0; b<totvert; b++) {
+		mmd->bindoffsets[b]= totinfluence;
+		totweight= 0.0f;
+
+		/* sum total weight */
+		for(a=0; a<totcagevert; a++) {
+			weight= weights[a + b*totcagevert];
+
+			if(weight > MESHDEFORM_MIN_INFLUENCE)
+				totweight += weight;
+		}
+
+		/* assign weights normalized */
+		for(a=0; a<totcagevert; a++) {
+			weight= weights[a + b*totcagevert];
+
+			if(weight > MESHDEFORM_MIN_INFLUENCE) {
+				mmd->bindinfluences[totinfluence].weight= weight/totweight;
+				mmd->bindinfluences[totinfluence].vertex= a;
+				totinfluence++;
+			}
+		}
+	}
+
+	mmd->bindoffsets[b]= totinfluence;
+	
+	/* free */
+	MEM_freeN(mmd->bindweights);
+	mmd->bindweights= NULL;
+}
 
 ModifierTypeInfo modifierType_MeshDeform = {
 	/* name */              "MeshDeform",