--- tools\blender\meshy_old_port\reskin.py
+++ tools\blender\meshy_old_port\reskin.py
@@ -175,39 +175,17 @@
 log("zones: rigid", nrig, "limited", nlim, "rigid-mode" if RIGID else "")
 SPLIT = RIGID and os.environ.get("SPLIT") == "1"
 if SPLIT:
-    # Stone: cut the surface along block borders so each block moves as one rigid piece. A face takes
-    # the bone most of its corners follow; edges between faces of different bones are split, and every
-    # vertex then follows its faces' bone alone. Blocks part slightly at the joints instead of smearing.
-    bm = bmesh.new(); bm.from_mesh(me.data)
-    deform = bm.verts.layers.deform.verify()
-    def bone_of(vert):
-        d = vert[deform]
-        return max(d.items(), key=lambda kv: kv[1])[0] if d else -1
-    face_bone = {}
-    for f in bm.faces:
-        votes = collections.Counter(bone_of(v) for v in f.verts)
-        face_bone[f.index] = votes.most_common(1)[0][0]
-    border = [e for e in bm.edges if len(e.link_faces) == 2
-              and face_bone[e.link_faces[0].index] != face_bone[e.link_faces[1].index]]
-    bmesh.ops.split_edges(bm, edges=border)
-    bm.faces.ensure_lookup_table()
-    owner = {}
-    for f in bm.faces:
-        for v in f.verts:
-            owner.setdefault(v.index, collections.Counter())[face_bone[f.index]] += 1
-    for v in bm.verts:
-        if v.index in owner:
-            b = owner[v.index].most_common(1)[0][0]
-            v[deform].clear(); v[deform][b] = 1.0
-    bm.to_mesh(me.data); bm.free()
-    log("split along", len(border), "border edges ->", len(me.data.vertices), "vertices")
+    # Close every rigid piece, including its interior joint faces.
+    sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))
+    from close_rigid_blocks import seal_rigid_blocks
+    log("sealed rigid blocks", seal_rigid_blocks(me))
 elif RIGID:  # blend only along block borders; block interiors keep a single bone
     weight_ops((bpy.ops.object.vertex_group_smooth, dict(group_select_mode="ALL", factor=0.5, repeat=int(os.environ.get("SEAM", "3")))),
                (bpy.ops.object.vertex_group_normalize_all, dict(lock_active=False)))
 elif Z and not KEEP:
     weight_ops((bpy.ops.object.vertex_group_smooth, dict(group_select_mode="ALL", factor=0.3, repeat=1)),
                (bpy.ops.object.vertex_group_normalize_all, dict(lock_active=False)))
-if Z.get("rigid") and (RIGID or not KEEP):
+if Z.get("rigid") and (RIGID or not KEEP) and not SPLIT:
     reassert_rigid()
 
 cnt = collections.Counter()