solidify rim material option, use the next material slot for rim faces.

a bit arbitrary but with most cases where solidify is used in durian we get UV texture stretching since there is no way to access the newly created size faces this gives us a way to switch out the material on the rim.

1 files changed, 6 insertions, 0 deletions

diff --git a/source/blender/modifiers/intern/MOD_solidify.c b/source/blender/modifiers/intern/MOD_solidify.c
index 72907f5a2ee..1eb8f288006 100644
--- a/source/blender/modifiers/intern/MOD_solidify.c
+++ b/source/blender/modifiers/intern/MOD_solidify.c
@@ -514,6 +514,8 @@ static DerivedMesh *applyModifier(ModifierData *md,
 		float (*edge_vert_nos)[3]= MEM_callocN(sizeof(float) * numVerts * 3, "solidify_edge_nos");
 		float nor[3];
 #endif
+		/* maximum value -1, so we have room to increase */
+		const short mat_nr_shift= (smd->flag & MOD_SOLIDIFY_RIM_MATERIAL) ? ob->totcol-1 : -1;
 
 		const unsigned char crease_rim= smd->crease_rim * 255.0f;
 		const unsigned char crease_outer= smd->crease_outer * 255.0f;
@@ -572,6 +574,10 @@ static DerivedMesh *applyModifier(ModifierData *md,
 				mf->v3= ed->v1 + numVerts;
 				mf->v4= ed->v2 + numVerts;
 			}
+			
+			/* use the next material index if option enabled */
+			if(mf->mat_nr < mat_nr_shift)
+				mf->mat_nr++;
 
 			if(crease_outer)
 				ed->crease= crease_outer;