Rest shape key for cloth option, this makes it possible

to specify different spring lengths.

Implementation is quite ugly because the shape key has to be pulled
through the modifier stack somehow, need a more flexible data mask
system to solve this properly.

(commits 27773,27775,27778 by Brecht from render25 branch)

1 files changed, 29 insertions, 11 deletions

diff --git a/source/blender/blenkernel/intern/cloth.c b/source/blender/blenkernel/intern/cloth.c
index 33fe6212cd2..2b11c4bdfa0 100644
--- a/source/blender/blenkernel/intern/cloth.c
+++ b/source/blender/blenkernel/intern/cloth.c
@@ -721,6 +721,15 @@ static void cloth_to_object (Object *ob,  ClothModifierData *clmd, DerivedMesh *
 }
 
 
+int cloth_uses_vgroup(ClothModifierData *clmd)
+{
+	return (((clmd->sim_parms->flags & CLOTH_SIMSETTINGS_FLAG_SCALING ) || 
+		(clmd->sim_parms->flags & CLOTH_SIMSETTINGS_FLAG_GOAL )) && 
+		((clmd->sim_parms->vgroup_mass>0) || 
+		(clmd->sim_parms->vgroup_struct>0)||
+		(clmd->sim_parms->vgroup_bend>0)));
+}
+
 /**
  * cloth_apply_vgroup - applies a vertex group as specified by type
  *
@@ -744,11 +753,7 @@ static void cloth_apply_vgroup ( ClothModifierData *clmd, DerivedMesh *dm )
 
 	verts = clothObj->verts;
 	
-	if (((clmd->sim_parms->flags & CLOTH_SIMSETTINGS_FLAG_SCALING ) || 
-			 (clmd->sim_parms->flags & CLOTH_SIMSETTINGS_FLAG_GOAL )) && 
-			 ((clmd->sim_parms->vgroup_mass>0) || 
-			 (clmd->sim_parms->vgroup_struct>0)||
-			 (clmd->sim_parms->vgroup_bend>0)))
+	if (cloth_uses_vgroup(clmd))
 	{
 		for ( i = 0; i < numverts; i++, verts++ )
 		{	
@@ -805,6 +810,7 @@ static int cloth_from_object(Object *ob, ClothModifierData *clmd, DerivedMesh *d
 	int i = 0;
 	MVert *mvert = NULL;
 	ClothVertex *verts = NULL;
+	float (*shapekey_rest)[3]= NULL;
 	float tnull[3] = {0,0,0};
 	Cloth *cloth = NULL;
 	float maxdist = 0;
@@ -842,7 +848,11 @@ static int cloth_from_object(Object *ob, ClothModifierData *clmd, DerivedMesh *d
 	clmd->clothObject->springs = NULL;
 	clmd->clothObject->numsprings = -1;
 	
+	if( clmd->sim_parms->shapekey_rest )
+		shapekey_rest = dm->getVertDataArray ( dm, CD_CLOTH_ORCO );
+
 	mvert = dm->getVertArray ( dm );
+
 	verts = clmd->clothObject->verts;
 
 	// set initial values
@@ -850,8 +860,16 @@ static int cloth_from_object(Object *ob, ClothModifierData *clmd, DerivedMesh *d
 	{
 		if(first)
 		{
-			VECCOPY ( verts->x, mvert[i].co );
+			copy_v3_v3( verts->x, mvert[i].co );
+
 			mul_m4_v3( ob->obmat, verts->x );
+
+			if( shapekey_rest ) {
+				verts->xrest= shapekey_rest[i];
+				mul_m4_v3( ob->obmat, verts->xrest );
+			}
+			else
+				verts->xrest = verts->x;
 		}
 		
 		/* no GUI interface yet */
@@ -1070,7 +1088,7 @@ static int cloth_build_springs ( ClothModifierData *clmd, DerivedMesh *dm )
 		{
 			spring->ij = MIN2(medge[i].v1, medge[i].v2);
 			spring->kl = MAX2(medge[i].v2, medge[i].v1);
-			VECSUB ( temp, cloth->verts[spring->kl].x, cloth->verts[spring->ij].x );
+			VECSUB ( temp, cloth->verts[spring->kl].xrest, cloth->verts[spring->ij].xrest );
 			spring->restlen =  sqrt ( INPR ( temp, temp ) );
 			clmd->sim_parms->avg_spring_len += spring->restlen;
 			cloth->verts[spring->ij].avg_spring_len += spring->restlen;
@@ -1116,7 +1134,7 @@ static int cloth_build_springs ( ClothModifierData *clmd, DerivedMesh *dm )
 
 		spring->ij = MIN2(mface[i].v1, mface[i].v3);
 		spring->kl = MAX2(mface[i].v3, mface[i].v1);
-		VECSUB ( temp, cloth->verts[spring->kl].x, cloth->verts[spring->ij].x );
+		VECSUB ( temp, cloth->verts[spring->kl].xrest, cloth->verts[spring->ij].xrest );
 		spring->restlen =  sqrt ( INPR ( temp, temp ) );
 		spring->type = CLOTH_SPRING_TYPE_SHEAR;
 		spring->stiffness = (cloth->verts[spring->kl].shear_stiff + cloth->verts[spring->ij].shear_stiff) / 2.0;
@@ -1139,7 +1157,7 @@ static int cloth_build_springs ( ClothModifierData *clmd, DerivedMesh *dm )
 
 		spring->ij = MIN2(mface[i].v2, mface[i].v4);
 		spring->kl = MAX2(mface[i].v4, mface[i].v2);
-		VECSUB ( temp, cloth->verts[spring->kl].x, cloth->verts[spring->ij].x );
+		VECSUB ( temp, cloth->verts[spring->kl].xrest, cloth->verts[spring->ij].xrest );
 		spring->restlen =  sqrt ( INPR ( temp, temp ) );
 		spring->type = CLOTH_SPRING_TYPE_SHEAR;
 		spring->stiffness = (cloth->verts[spring->kl].shear_stiff + cloth->verts[spring->ij].shear_stiff) / 2.0;
@@ -1181,7 +1199,7 @@ static int cloth_build_springs ( ClothModifierData *clmd, DerivedMesh *dm )
 
 					spring->ij = MIN2(tspring2->ij, index2);
 					spring->kl = MAX2(tspring2->ij, index2);
-					VECSUB ( temp, cloth->verts[spring->kl].x, cloth->verts[spring->ij].x );
+					VECSUB ( temp, cloth->verts[spring->kl].xrest, cloth->verts[spring->ij].xrest );
 					spring->restlen =  sqrt ( INPR ( temp, temp ) );
 					spring->type = CLOTH_SPRING_TYPE_BENDING;
 					spring->stiffness = (cloth->verts[spring->kl].bend_stiff + cloth->verts[spring->ij].bend_stiff) / 2.0;
@@ -1221,7 +1239,7 @@ static int cloth_build_springs ( ClothModifierData *clmd, DerivedMesh *dm )
 
 				spring->ij = tspring2->ij;
 				spring->kl = tspring->kl;
-				VECSUB ( temp, cloth->verts[spring->kl].x, cloth->verts[spring->ij].x );
+				VECSUB ( temp, cloth->verts[spring->kl].xrest, cloth->verts[spring->ij].xrest );
 				spring->restlen =  sqrt ( INPR ( temp, temp ) );
 				spring->type = CLOTH_SPRING_TYPE_BENDING;
 				spring->stiffness = (cloth->verts[spring->kl].bend_stiff + cloth->verts[spring->ij].bend_stiff) / 2.0;