diff --git a/source/engine/2dphysics.c b/source/engine/2dphysics.c
index c40b056..a398ce5 100644
--- a/source/engine/2dphysics.c
+++ b/source/engine/2dphysics.c
@@ -488,6 +488,7 @@ void phys2d_applyedge(struct phys2d_edge *edge)
 	cpShapeSetCollisionType(edge->shapes[i], edge->shape.go);
 	cpShapeSetFriction(edge->shapes[i], id2go(edge->shape.go)->f);
 	cpShapeSetElasticity(edge->shapes[i], id2go(edge->shape.go)->e);
+	cpShapeSetSensor(edge->shapes[i], id2go(edge->shape.go)->sensor);
     }
 
     cpSpaceReindexShapesForBody(space, id2go(edge->shape.go)->body);
@@ -542,11 +543,22 @@ int shape_is_enabled(struct phys2d_shape *shape)
 
 void shape_set_sensor(struct phys2d_shape *shape, int sensor)
 {
-    cpShapeSetSensor(shape->shape, sensor);
+    if (!shape->shape) {
+      struct phys2d_edge *edge = shape->data;
+
+      for (int i = 0; i < arrlen(edge->shapes); i++) {
+        cpShapeSetSensor(edge->shapes[i], sensor);
+      YughInfo("Setting shape %d sensor to %d", i, sensor);	
+      }
+    } else
+      cpShapeSetSensor(shape->shape, sensor);
 }
 
 int shape_get_sensor(struct phys2d_shape *shape)
 {
+    if (!shape->shape) {
+      return cpShapeGetSensor(((struct phys2d_edge *)(shape->data))->shapes[0]);
+    }
     return cpShapeGetSensor(shape->shape);
 }
 
@@ -590,8 +602,6 @@ static cpBool script_phys_cb_begin(cpArbiter *arb, cpSpace *space, void *data) {
     int g2 = cpBodyGetUserData(body2);
     struct gameobject *go = id2go(g1);
 
-    
-
     for (int i = 0; i < arrlen(go->shape_cbs); i++) {
       if (go->shape_cbs[i].shape != shape1) continue;
       duk_call_phys_cb(arb, go->shape_cbs[i].cbs.begin, g2);
diff --git a/source/engine/2dphysics.h b/source/engine/2dphysics.h
index c89ac93..26221e4 100644
--- a/source/engine/2dphysics.h
+++ b/source/engine/2dphysics.h
@@ -54,7 +54,7 @@ struct phys2d_box {
     struct phys2d_shape shape;
 };
 
-/* An edge with no volume. Cannot collide with each other. Join to make levels. */
+/* An edge with no volume. Cannot collide with each other. Join to make levels. Static only. */
 struct phys2d_edge {
     cpVect *points;
     float thickness;
diff --git a/source/engine/ffi.c b/source/engine/ffi.c
index c098442..20e7abb 100644
--- a/source/engine/ffi.c
+++ b/source/engine/ffi.c
@@ -709,6 +709,10 @@ duk_ret_t duk_cmd(duk_context *duk) {
 	case 68:
 	  opengl_rendermode(WIREFRAME);
 	  break;
+
+	case 69:
+	  gameobject_set_sensor(duk_to_int(duk, 1), duk_to_boolean(duk,2));
+	  break;
     }
 
     return 0;
diff --git a/source/engine/gameobject.c b/source/engine/gameobject.c
index 41aa61f..d7be574 100644
--- a/source/engine/gameobject.c
+++ b/source/engine/gameobject.c
@@ -80,10 +80,19 @@ int id_from_gameobject(struct gameobject *go) {
     return -1;
 }
 
+void gameobject_set_sensor(int id, int sensor)
+{
+  id2go(id)->sensor = sensor;
+  gameobject_apply(id2go(id));
+}
+
 void go_shape_apply(cpBody *body, cpShape *shape, struct gameobject *go)
 {
     cpShapeSetFriction(shape, go->f);
     cpShapeSetElasticity(shape, go->e);
+    cpShapeSetSensor(shape, go->sensor);
+    if (go->sensor)
+      YughInfo("Enabled a sensor ...");
 //    cpShapeSetFilter(shape, go->filter);
 }
 
@@ -116,7 +125,8 @@ int MakeGameobject()
         .scale = 1.f,
         .bodytype = CP_BODY_TYPE_STATIC,
         .mass = 1.f,
-        .next = -1
+        .next = -1,
+	.sensor = 0,
     };
 
     go.body = cpSpaceAddBody(space, cpBodyNew(go.mass, 1.f));
@@ -239,36 +249,6 @@ void gameobject_saveprefab(struct gameobject *go)
     */
 }
 
-void gameobject_syncprefabs(char *revertPath)
-{
-/*
-   struct gameobject **go = objects;
-   int i = 0;
-   while(i != nobjects) {
-   	if ((*go)->editor.curPrefabPath && !strcmp((*go)->editor.curPrefabPath, revertPath)) { ; }//objectRevertPrefab(go); //TODO: revertprefab
-   }
-*/
-}
-
-void gameobject_revertprefab(struct gameobject *go)
-{
-
-}
-
-void toggleprefab(struct gameobject *go)
-{
-/*
-    go->editor.prefabSync = !go->editor.prefabSync;
-
-    if (go->editor.prefabSync) {
-	strcpy(go->editor.prefabName, go->editor.rootPrefabName);
-	gameobject_revertprefab(go);	//TODO: object revert prefab
-    } else {
-	go->editor.prefabName[0] = '\0';
-    }
-    */
-}
-
 void gameobject_move(struct gameobject *go, cpVect vec)
 {
     cpVect p = cpBodyGetPosition(go->body);
diff --git a/source/engine/gameobject.h b/source/engine/gameobject.h
index 50184b0..38153cb 100644
--- a/source/engine/gameobject.h
+++ b/source/engine/gameobject.h
@@ -21,6 +21,7 @@ struct gameobject {
     float e;			/* elasticity */
     int flipx; /* 1 or -1 */
     int flipy;
+    int sensor;
     cpShapeFilter filter;
     cpBody *body; /* NULL if this object is dead */
     int id;
@@ -34,7 +35,8 @@ int MakeGameobject();
 void gameobject_apply(struct gameobject *go);
 void gameobject_delete(int id);
 void gameobjects_cleanup();
-void toggleprefab(struct gameobject *go);
+
+void gameobject_set_sensor(int id, int sensor);
 
 struct gameobject *get_gameobject_from_id(int id);
 struct gameobject *id2go(int id);
@@ -47,8 +49,6 @@ void go_shape_apply(cpBody *body, cpShape *shape, struct gameobject *go);
 void gameobject_save(struct gameobject *go, FILE * file);
 
 void gameobject_saveprefab(struct gameobject *go);
-void gameobject_syncprefabs(char *revertPath);
-void gameobject_revertprefab(struct gameobject *go);
 
 /* Tries a few methods to select a gameobject; if none is selected returns -1 */
 int pos2gameobject(cpVect pos);