add interior vertex group option.

object_fracture_cell/__init__.py

@@ -392,7 +392,7 @@ class FractureCell(Operator):
         rowsub.prop(self, "use_smooth_faces")
         rowsub.prop(self, "use_smooth_edges")
         rowsub.prop(self, "use_data_match")
-        # rowsub.prop(self, "use_interior_vgroup")
+        rowsub.prop(self, "use_interior_vgroup")
         rowsub.prop(self, "material_index")
         rowsub = col.row()
         # could be own section, control how we subdiv

object_fracture_cell/fracture_cell_setup.py

@@ -324,6 +324,9 @@ def cell_fracture_boolean(scene, obj, objects,
                           ):
 
     objects_boolean = []
+
+    if use_interior_vgroup:
+        obj.data.polygons.foreach_set("hide", [False] * len(obj.data.polygons))
     
     for obj_cell in objects:
         mod = obj_cell.modifiers.new(name="Boolean", type='BOOLEAN')
@@ -331,6 +334,10 @@ def cell_fracture_boolean(scene, obj, objects,
         mod.operation = 'INTERSECT'
 
         if not use_debug_bool:
+
+            if use_interior_vgroup:
+                obj_cell.data.polygons.foreach_set("hide", [True] * len(obj_cell.data.polygons))
+
             mesh_new = obj_cell.to_mesh(scene,
                                         apply_modifiers=True,
                                         settings='PREVIEW')
@@ -366,6 +373,28 @@ def cell_fracture_boolean(scene, obj, objects,
                 bm.to_mesh(mesh_new)
                 bm.free()
 
+            if use_interior_vgroup and mesh_new:
+                bm = bmesh.new()
+                bm.from_mesh(mesh_new)
+                for bm_vert in bm.verts:
+                    bm_vert.tag = True
+                for bm_face in bm.faces:
+                    if not bm_face.hide:
+                        for bm_vert in bm_face.verts:
+                            bm_vert.tag = False
+                # now add all vgroups
+                defvert_lay = bm.verts.layers.deform.verify()
+                for bm_vert in bm.verts:
+                    if bm_vert.tag:
+                        bm_vert[defvert_lay][0] = 1.0
+                for bm_face in bm.faces:
+                    bm_face.hide = False
+                bm.to_mesh(mesh_new)
+                bm.free()
+
+                # add a vgroup
+                obj_cell.vertex_groups.new(name="Interior")
+
         if obj_cell is not None:
             objects_boolean.append(obj_cell)