1 files changed, 4 insertions, 1 deletions
diff --git a/Portal.h b/Portal.h
index 3596bc2..2208946 100644
--- a/Portal.h
+++ b/Portal.h
@@ -130,8 +130,11 @@ class Portal : public LevelObject, public VertexProvider {
       return !connected[id];
     }
     
-    virtual void connectVertex(size_t id) {
+    virtual size_t connectVertex(size_t id) {
       connected[id] = true;
+      connected[(7-id)%4] = true;
+      
+      return (7-id)%4;
     }
 };