Index: trunk/src/plugins/rt_topo/crbs_cdt.c
===================================================================
--- trunk/src/plugins/rt_topo/crbs_cdt.c	(revision 1356)
+++ trunk/src/plugins/rt_topo/crbs_cdt.c	(revision 1357)
@@ -74,7 +74,36 @@
 		}
 	}
 
+	if (crbs->enable_mid_virt) {
+		vtd0_t np = {0};
+		double minlen2 = (rt_topo_cfg.wire_thick + rt_topo_cfg.wire_clr/2) * 4; /* minimum length of an edge to split */
 
+		minlen2 = minlen2 * minlen2;
+
+		for(n = 0; n < cdt->edges.used; n++) {
+			double len;
+			edge_t *e = cdt->edges.array[n];
+			double dx, dy, len2;
+			
+			if (e->is_constrained)
+				continue;
+
+			dx = e->endp[0]->pos.x - e->endp[1]->pos.x;
+			dy = e->endp[0]->pos.y - e->endp[1]->pos.y;
+			len2 = dx*dx + dy*dy;
+			if (len2 > minlen2) {
+				vtd0_append(&np, (e->endp[0]->pos.x + e->endp[1]->pos.x)/2);
+				vtd0_append(&np, (e->endp[0]->pos.y + e->endp[1]->pos.y)/2);
+			}
+			e->is_constrained = 1;
+		}
+		for(n = 0; n < np.used; n+=2) {
+			cdt_insert_point(&crbs->cdt, np.array[n], np.array[n+1]);
+/*			crbs_make_point(crbs, np.array[n], np.array[n+1], 0, 0, NULL);*/
+		}
+		vtd0_uninit(&np);
+	}
+
 	for(n = 0; n < cdt->edges.used; n++) {
 		edge_t *e = cdt->edges.array[n];
 #warning TODO: use libualloc here
Index: trunk/src/plugins/rt_topo/crbs_route.c
===================================================================
--- trunk/src/plugins/rt_topo/crbs_route.c	(revision 1356)
+++ trunk/src/plugins/rt_topo/crbs_route.c	(revision 1357)
@@ -617,8 +617,9 @@
 	int res, tries;
 
 	memset(&crbs, 0, sizeof(crbs_t));
+	crbs.disable_concave = 1;
+	crbs.enable_mid_virt = 1;
 	rt_topo_crbs_cdt_init(ctx, ly, &crbs);
-	crbs.disable_concave = 1;
 	crbs_init(&crbs, ctx);
 
 	rtrnd_layer_init(&ly_cdt, "laa");