Index: trunk/src/obj_pstk_inlines.h
===================================================================
--- trunk/src/obj_pstk_inlines.h	(revision 32747)
+++ trunk/src/obj_pstk_inlines.h	(revision 32748)
@@ -332,18 +332,14 @@
 	return pcb_pstk_shape_mech_gid(pcb, ps, layer->meta.real.grp);
 }
 
-/* Returns a shape correspinding to the hole or the mech shape (slot) if
-   it affects layer; hole shape is created in holetmp */
-RND_INLINE pcb_pstk_shape_t *pcb_pstk_shape_mech_or_hole_at(pcb_board_t *pcb, pcb_pstk_t *ps, pcb_layer_t *layer, pcb_pstk_shape_t *holetmp)
+/* Returns a shape corresponding to the hole or the mech shape (slot) regardless
+   of layers. 
+   *DO NOT USE*, this call is designed for padstack internal code. Use
+   pcb_pstk_shape_mech_or_hole_at() instead. (Hole shape is created in holetmp) */
+RND_INLINE pcb_pstk_shape_t *pcb_pstk_shape_mech_or_hole_(pcb_pstk_t *ps, pcb_pstk_proto_t *proto, pcb_pstk_shape_t *holetmp)
 {
 	pcb_pstk_tshape_t *ts;
-	pcb_pstk_proto_t *proto;
 
-	layer = pcb_layer_get_real(layer);
-
-	if (!pcb_pstk_bb_drills(pcb, ps, pcb_layer_get_group_(layer), &proto))
-		return NULL;
-
 	/* hole has priority */
 	if (proto->hdia > 0) {
 		holetmp->shape = PCB_PSSH_CIRC;
@@ -360,6 +356,20 @@
 	return ts->shape + proto->mech_idx;
 }
 
+/* Returns a shape corresponding to the hole or the mech shape (slot) if
+   it affects layer; hole shape is created in holetmp */
+RND_INLINE pcb_pstk_shape_t *pcb_pstk_shape_mech_or_hole_at(pcb_board_t *pcb, pcb_pstk_t *ps, pcb_layer_t *layer, pcb_pstk_shape_t *holetmp)
+{
+	pcb_pstk_proto_t *proto;
+
+	layer = pcb_layer_get_real(layer);
+
+	if (!pcb_pstk_bb_drills(pcb, ps, pcb_layer_get_group_(layer), &proto))
+		return NULL;
+
+	return pcb_pstk_shape_mech_or_hole_(ps, proto, holetmp);
+}
+
 /* Return the shape of the hshadow, if it is not the same as the forbidden
    shape. The forbidden shape should be the shape that triggers the lookup.
    tmpshp should be a local temporary shape where the circular shape for a
Index: trunk/src/obj_pstk_proto.c
===================================================================
--- trunk/src/obj_pstk_proto.c	(revision 32747)
+++ trunk/src/obj_pstk_proto.c	(revision 32748)
@@ -72,6 +72,7 @@
 	dst->mech_idx = -1;
 
 	if (ts != NULL) {
+		/* find and cache the index of the mech shape (slot) */
 		for(n = 0; n < ts->len; n++) {
 			if (ts->shape[n].layer_mask & PCB_LYT_MECH) {
 				dst->mech_idx = n;
@@ -78,6 +79,10 @@
 				break;
 			}
 		}
+
+		/* mark each copper shape with whether it overlaps with the hole/mech shape or not */
+		for(n = 0; n < ts->len; n++) {
+		}
 	}
 }