diff --git a/source/engine/2dphysics.c b/source/engine/2dphysics.c
index 0cf934f..04e1b6d 100644
--- a/source/engine/2dphysics.c
+++ b/source/engine/2dphysics.c
@@ -430,6 +430,7 @@ struct phys2d_edge *Make2DEdge(int go) {
   new->shape.moi = phys2d_edge_moi;
   new->shape.shape = NULL;
   new->draws = 0;
+  new->closed = 0;
   phys2d_applyedge(new);
 
   return new;
@@ -572,8 +573,12 @@ void shape_set_sensor(struct phys2d_shape *shape, int sensor) {
 
 int shape_get_sensor(struct phys2d_shape *shape) {
   if (!shape->shape) {
-    return cpShapeGetSensor(((struct phys2d_edge *)(shape->data))->shapes[0]);
+    struct phys2d_edge *edge = shape->data;
+    if (arrlen(edge->shapes) > 0) return cpShapeGetSensor(edge->shapes[0]);
+	
+    return 0;
   }
+
   return cpShapeGetSensor(shape->shape);
 }
 
@@ -593,6 +598,7 @@ void duk_call_phys_cb(cpVect norm, struct callee c, int hit, cpArbiter *arb) {
   JS_SetPropertyStr(js, obj, "velocity", vec2js(cpArbiterGetSurfaceVelocity(arb)));
   JS_SetPropertyStr(js, obj, "pos", vec2js(cpArbiterGetPointA(arb, 0)));
   JS_SetPropertyStr(js, obj, "id", JS_NewInt32(js,hit));
+  JS_SetPropertyStr(js,obj,"obj", JS_DupValue(js,id2go(hit)->ref));
   script_callee(c, 1, &obj);
 }
 
diff --git a/source/engine/debug/debugdraw.c b/source/engine/debug/debugdraw.c
index 8ec95c3..4844403 100644
--- a/source/engine/debug/debugdraw.c
+++ b/source/engine/debug/debugdraw.c
@@ -81,17 +81,6 @@ static struct circle_vertex circle_b[v_amt];
 
 void debug_flush()
 {
-  if (circle_count != 0) {
-  sg_apply_pipeline(circle_pipe);
-  sg_apply_bindings(&circle_bind);
-  sg_apply_uniforms(SG_SHADERSTAGE_VS, 0, SG_RANGE_REF(projection));
-  sg_update_buffer(circle_bind.vertex_buffers[0], &(sg_range){
-    .ptr = circle_b,
-    .size = sizeof(struct circle_vertex)*circle_count
-  });
-  sg_draw(0,4,circle_count);
-  circle_count = 0;
-  }
 
   if (poly_c != 0) {
   sg_apply_pipeline(poly_pipe);
@@ -135,6 +124,19 @@ void debug_flush()
   line_c = 0;
   line_v = 0;
   }
+
+  if (circle_count != 0) {
+  sg_apply_pipeline(circle_pipe);
+  sg_apply_bindings(&circle_bind);
+  sg_apply_uniforms(SG_SHADERSTAGE_VS, 0, SG_RANGE_REF(projection));
+  sg_update_buffer(circle_bind.vertex_buffers[0], &(sg_range){
+    .ptr = circle_b,
+    .size = sizeof(struct circle_vertex)*circle_count
+  });
+  sg_draw(0,4,circle_count);
+  circle_count = 0;
+  }
+  
 }
 
 static sg_shader_uniform_block_desc projection_ubo = {
@@ -311,6 +313,7 @@ void debugdraw_init()
 void draw_line(cpVect *a_points, int a_n, struct rgba color, float seg_len, int closed, float seg_speed)
 {
   if (a_n < 2) return;
+  seg_speed = 1;
 
   int n = closed ? a_n+1 : a_n;
   cpVect points[n];
diff --git a/source/engine/ffi.c b/source/engine/ffi.c
index 7556b6e..94f22e9 100644
--- a/source/engine/ffi.c
+++ b/source/engine/ffi.c
@@ -85,6 +85,11 @@ int js2bool(JSValue v) {
   return JS_ToBool(js, v);
 }
 
+JSValue bool2js(int b)
+{
+  return JS_NewBool(js,b);
+}
+
 JSValue float2js(double g) {
   return JS_NewFloat64(js, g);
 }
@@ -97,6 +102,8 @@ struct gameobject *js2go(JSValue v) {
   return id2go(js2int(v));
 }
 
+struct sprite *js2sprite(JSValue v) { return id2go(js2int(v)); }
+
 void *js2ptr(JSValue v) {
   void *p;
   JS_ToInt64(js, &p, v);
@@ -212,6 +219,12 @@ JSValue vec2js(cpVect v) {
   return array;
 }
 
+JSValue v22js(HMM_Vec2 v)
+{
+  cpVect c = { v.X, v.Y };
+  return vec2js(c);
+}
+
 JSValue vecarr2js(cpVect *points, int n) {
   JSValue array = JS_NewArray(js);
   for (int i = 0; i < n; i++)
@@ -978,19 +991,32 @@ JSValue duk_cmd(JSContext *js, JSValueConst this, int argc, JSValueConst *argv)
     return bool2js(js2go(argv[1])->flipy);
 
   case 106:
-    js2go(argv[1])->e = js2num(argv[2]);
+    js2go(argv[1])->e = js2number(argv[2]);
     break;
 
   case 107:
     return num2js(js2go(argv[1])->e);
 
   case 108:
-    js2go(argv[1])->f = js2num(argv[2]);
+    js2go(argv[1])->f = js2number(argv[2]);
     break;
   case 109:
     return num2js(js2go(argv[1])->f);
   case 110:
-    return num2js(js2go(argv[1])
+    return num2js(js2go(argv[1])->e);
+
+    case 111:
+      return v22js(js2sprite(argv[1])->pos);
+
+    case 112:
+      return num2js(((struct phys2d_edge*)js2ptr(argv[1]))->thickness);
+
+    case 113:
+      js2go(argv[1])->ref = JS_DupValue(js,argv[2]);
+      break;
+
+    case 114:
+      return bool2js(js2sprite(argv[1])->enabled);
   }
 
   if (str)
@@ -1186,6 +1212,8 @@ JSValue duk_set_body(JSContext *js, JSValueConst this, int argc, JSValueConst *a
 
   case 1:
     go->bodytype = js2int(argv[2]);
+    cpBodySetType(go->body, go->bodytype);
+    gameobject_apply(go);
     break;
 
   case 2:
@@ -1209,7 +1237,11 @@ JSValue duk_set_body(JSContext *js, JSValueConst this, int argc, JSValueConst *a
     break;
 
   case 7:
-    cpBodySetMass(go->body, js2number(argv[2]));
+    if (go->bodytype == CP_BODY_TYPE_DYNAMIC)
+      cpBodySetMass(go->body, js2number(argv[2]));
+    else
+      YughWarn("Cannot set mass of a non dynamic body.");
+      
     break;
 
   case 8:
diff --git a/source/engine/gameobject.c b/source/engine/gameobject.c
index 3b45ba0..dd1e757 100644
--- a/source/engine/gameobject.c
+++ b/source/engine/gameobject.c
@@ -105,7 +105,7 @@ void go_shape_moi(cpBody *body, cpShape *shape, struct gameobject *go) {
   }
 
   moment += s->moi(s->data, go->mass);
-  if (moment < 0) moment = 0;
+  if (moment < 0) moment = 1;
   cpBodySetMoment(go->body, moment);
 }
 
@@ -145,6 +145,7 @@ int MakeGameobject() {
       .next = -1,
       .sensor = 0,
       .shape_cbs = NULL,
+      .ref = JS_NULL,
   };
 
   go.cbs.begin.obj = JS_NULL;
diff --git a/source/engine/gameobject.h b/source/engine/gameobject.h
index 57003c7..b9c0abd 100644
--- a/source/engine/gameobject.h
+++ b/source/engine/gameobject.h
@@ -6,6 +6,7 @@
 #include <chipmunk/chipmunk.h>
 #include <stdbool.h>
 #include <stdio.h>
+#include "quickjs/quickjs.h"
 
 struct shader;
 struct sprite;
@@ -27,6 +28,7 @@ struct gameobject {
   int id;
   struct phys_cbs cbs;
   struct shape_cb *shape_cbs;
+  JSValue ref;
 };
 
 extern struct gameobject *gameobjects;
diff --git a/source/engine/openglrender.c b/source/engine/openglrender.c
index 997b53e..f048965 100644
--- a/source/engine/openglrender.c
+++ b/source/engine/openglrender.c
@@ -331,6 +331,7 @@ void openglRender(struct window *window) {
   sprite_flush();
 
   call_draw();
+//  debug_flush();
 
   //// DEBUG
   if (debugDrawPhysics) {
diff --git a/source/engine/yugine.c b/source/engine/yugine.c
index cd9b2f1..25d4a99 100644
--- a/source/engine/yugine.c
+++ b/source/engine/yugine.c
@@ -221,7 +221,7 @@ int main(int argc, char **args) {
         phys_step = 1;
         physlag -= physMS;
         phys2d_update(physMS * timescale);
-        call_physics(physMS * timescale);
+	call_physics(physMS * timescale);
         if (sim_play == SIM_STEP) sim_pause();
         phys_step = 0;
       }
diff --git a/source/scripts/base.js b/source/scripts/base.js
index a9dc894..0bc6508 100644
--- a/source/scripts/base.js
+++ b/source/scripts/base.js
@@ -71,6 +71,17 @@ Object.defineProperty(Object.prototype, 'nulldef', {
   }
 });
 
+/*Object.defineProperty(Object.prototype, 'writable', {
+  value: function(name) {
+    return Object.getPropertyDescriptor(this, name).writable;
+  }
+});
+*/
+
+Object.defineProperty(Object.prototype, 'prop_obj', {
+  value: function() { return JSON.parse(JSON.stringify(this)); }
+});
+
 /* defc 'define constant'. Defines a value that is not writable. */
 Object.defineProperty(Object.prototype, 'defc', {
   value: function(name, val) {
@@ -83,6 +94,18 @@ Object.defineProperty(Object.prototype, 'defc', {
   }
 });
 
+Object.defineProperty(Object.prototype, 'stick', {
+  value: function(prop) {
+    Object.defineProperty(this, prop, {writable:false});
+  }
+});
+
+Object.defineProperty(Object.prototype, 'harden', {
+  value: function(prop) {
+    Object.defineProperty(this, prop, {writable:false, configurable:false, enumerable: false});
+  }
+});
+
 Object.defineProperty(Object.prototype, 'deflock', {
   value: function(prop) {
     Object.defineProperty(this,prop, {configurable:false});
diff --git a/source/scripts/components.js b/source/scripts/components.js
index 29f35b4..904fd04 100644
--- a/source/scripts/components.js
+++ b/source/scripts/components.js
@@ -7,8 +7,7 @@ var component = {
   },
   name: "component",
   component: true,
-  set enabled(x) { },
-  get enabled() { },
+  enabled: true,
   enable() { this.enabled = true; },
   disable() { this.enabled = false; },
   
@@ -29,7 +28,6 @@ var sprite = clone(component, {
   path: "",
   layer: 0,
   pos: [0,0],
-  enabled: true,
   get visible() { return this.enabled; },
   set visible(x) { this.enabled = x; },
   angle: 0,
@@ -43,34 +41,34 @@ var sprite = clone(component, {
   input_kp2_pressed() { this.pos = [-0.5,-1]; },
   input_kp1_pressed() { this.pos = [-1,-1]; },
   
-  get boundingbox() {
-    if (!this.gameobject) return null;
-    var dim = cmd(64, this.path);
-    dim = dim.scale(this.gameobject.scale);
-    var realpos = this.pos.copy();
-    realpos.x *= dim.x;
-    realpos.y *= dim.y;
-    realpos.x += (dim.x/2);
-    realpos.y += (dim.y/2);
-    return cwh2bb(realpos, dim);
-  },
-  
   make(go) {
     var old = this;
     var sprite = clone(this, {
-      get enabled() { return cmd(21,this.id); },
+      get enabled() { return cmd(114,this.id); },
       set enabled(x) { cmd(20,this.id,x); },
       set color(x) { cmd(96,this.id,x); },
+      get pos() { return cmd(111, this.id); },
       set pos(x) { cmd(37,this.id,x); },
       set layer(x) { cmd(60, this.id, x); },
       get layer() { return this.gameobject.draw_layer; },
       set path(x) { cmd(12,this.id,x,this.rect); },
 
+      get boundingbox() {
+        var dim = cmd(64,this.path);
+	dim = dim.scale(this.gameobject.scale);
+	var realpos = this.pos.copy();
+	realpos.x = realpos.x * dim.x + (dim.x/2);
+	realpos.y = realpos.y * dim.y + (dim.y/2);
+	return cwh2bb(realpos,dim);
+      },
+
       kill() { cmd(9,this.id); },
     });
 
+    sprite.obscure('boundingbox');
+
     var id = make_sprite(go,old.path,old.pos);
-    
+
     Object.defineProperty(sprite, 'id', {value:id});
 
     Object.assign(sprite, this);
@@ -177,6 +175,23 @@ var char2d = clone(sprite, {
   },
 });
 
+/* Returns points specifying this geometry, with ccw */
+var Geometry = {
+  box(w, h) {
+    w /= 2;
+    h /= 2;
+
+    var points = [
+      [w,h],
+      [-w,h],
+      [-w,-h],
+      [w,-h]
+    ];
+
+    return points;
+  }
+};
+
 /* For all colliders, "shape" is a pointer to a phys2d_shape, "id" is a pointer to the shape data */
 var collider2d = clone(component, {
   name: "collider 2d",
@@ -194,8 +209,6 @@ var collider2d = clone(component, {
     this.enabled = !this.enabled;
   },
 
-  enabled: true,
-  get enabled() { return this._enabled; },
   kill() {}, /* No killing is necessary - it is done through the gameobject's kill */
 
   register_hit(fn, obj) {
@@ -204,11 +217,22 @@ var collider2d = clone(component, {
 
   make_fns: {
     set sensor(x) { cmd(18,this.shape,x); },
-    set enabled(x) { cmd(22,this.id,x); }
+    get sensor() { return cmd(21,this.shape); },
+    set enabled(x) { cmd(22,this.shape,x); },
+    get enabled() {
+      Log.warn("getting enabled");
+      return cmd(23,this.shape); }
   },
   
 });
 
+var sync_proxy = {
+  set(t,p,v) {
+    t[p] = v;
+    t.sync();
+    return true;
+  }
+};
 
 var polygon2d = clone(collider2d, {
   name: "polygon 2d",
@@ -225,32 +249,35 @@ var polygon2d = clone(collider2d, {
 
   make(go) {
     var poly = Object.create(this);
-    complete_assign(poly, this.make_fns);
     Object.assign(poly, make_poly2d(go, this.points));
+    
+    complete_assign(poly, this.make_fns);
+    complete_assign(poly, {
+      get boundingbox() {
+        return points2bb(this.points.map(x => x.scale(this.gameobject.scale)));
+      },
+
+      sync() { cmd_poly2d(0, this.id, this.spoints); }
+    });
+    poly.obscure('boundingbox');
+
+    poly.defn('points', this.points.copy());
+
+    poly = new Proxy(poly, sync_proxy);
+
     Object.defineProperty(poly, 'id', {enumerable:false});
     Object.defineProperty(poly, 'shape', {enumerable:false});
 
     return poly;
   },
-  
-  get boundingbox() {
-    if (!this.gameobject) return null;
-    var scaledpoints = [];
-    this.points.forEach(function(x) { scaledpoints.push(x.scale(this.gameobject.scale)); }, this);
-    return points2bb(scaledpoints);
-  },
 
+  /* EDITOR */  
   help: "Ctrl-click Add a point\nShift-click Remove a point",  
   
   input_f10_pressed() {
     this.points = sortpointsccw(this.points);
   },
 
-  sync() {
-    if (!this.id) return;
-    cmd_poly2d(0, this.id, this.spoints);
-    this.coll_sync();
-  },
   
   input_b_pressed() {
     if (!Keys.ctrl()) return;
@@ -278,7 +305,7 @@ var polygon2d = clone(collider2d, {
 	spoints.push(newpoint);
       });
     }
-    
+
     return spoints;
   },
   
@@ -292,9 +319,6 @@ var polygon2d = clone(collider2d, {
     this.points.forEach(function(x, i) {
       Debug.numbered_point(this.gameobject.this2world(x), i);
     }, this);
-    
-
-    this.sync();
   },
   
   input_lmouse_pressed() {
@@ -325,7 +349,6 @@ var polygon2d = clone(collider2d, {
 
 var bucket = clone(collider2d, {
   name: "bucket",
-  help: "Ctrl-click Add a point\nShift-click Remove a point\n+,- Increase/decrease spline segs\nCtrl-+,- Inc/dec spline degrees\nCtrl-b,v Inc/dec spline thickness",
   clone(spec) {
     var obj = Object.create(this);
     obj.cpoints = this.cpoints.copy(); 
@@ -343,30 +366,11 @@ var bucket = clone(collider2d, {
   */
   type: 3,
   
-  get boundingbox() {
-    if (!this.gameobject) return null;
-    var scaledpoints = [];
-    this.points.forEach(function(x) { scaledpoints.push(x.scale(this.gameobject.scale)); }, this);
-    return points2bb(scaledpoints);
-  },
-  
   mirrorx: false,
   mirrory: false,
   
-  input_m_pressed() {
-    if (Keys.ctrl()) {
-      this.mirrory = !this.mirrory;
-    } else {
-      this.mirrorx = !this.mirrorx;
-    }
-    
-    this.sync();
-  },
-  
   hollow: false,
-  input_h_pressed() {
-    this.hollow = !this.hollow;
-  },
+  hollowt: 0,
   
   get spoints() {
     var spoints = this.cpoints.slice();
@@ -391,8 +395,8 @@ var bucket = clone(collider2d, {
 
     if (this.hollow) {
       var hpoints = [];
-      var inflatep = inflate_cpv(spoints, spoints.length, this.hollowt);
-      inflatep[0].slice().reverse().forEach(function(x) { hpoints.push(x); });
+      var inflatep = inflate_cpv(spoints, spoints.length, this.hollowt); 
+     inflatep[0].slice().reverse().forEach(function(x) { hpoints.push(x); });
       
       inflatep[1].forEach(function(x) { hpoints.push(x); });
       return hpoints;
@@ -401,19 +405,6 @@ var bucket = clone(collider2d, {
     return spoints;
   },
 
-  hollowt: 0,
-
-  input_g_pressed() {
-    if (!Keys.ctrl()) return;
-    this.hollowt--;
-    if (this.hollowt < 0) this.hollowt = 0;
-  },
-
-  input_f_pressed() {
-    if (!Keys.ctrl()) return;
-    this.hollowt++;
-  },
-  
   sample(n) {
     var spoints = this.spoints;
 
@@ -449,30 +440,38 @@ var bucket = clone(collider2d, {
   make(go) {
     var edge = Object.create(this);
     Object.assign(edge, make_edge2d(go, this.points, this.thickness));
-    Object.defineProperty(edge, 'id', {enumerable:false});
-    Object.defineProperty(edge, 'shape', {enumerable:false});
+    edge = new Proxy(edge, sync_proxy);    
     complete_assign(edge, {
       set thickness(x) {
         cmd_edge2d(1,this.id,x);
-      }
-    });
-    edge.defn('points', []);
-    
-    edge.sync();
+      },
+      get thickness() { return cmd(112,this.id); },
 
-    var synctriggers = ['samples', 'thickness'];
+      get boundingbox() {
+        return points2bb(this.points.map(x => x.scale(this.gameobject.scale)));
+      },
+
+      sync() {
+        var sensor = this.sensor;
+        this.points = this.sample(this.samples);
+        cmd_edge2d(0,this.id,this.points);
+	this.sensor = sensor;
+      },
+    });
+
+    edge.obscure('boundingbox');
+    
+    complete_assign(edge, this.make_fns);
+
+    Object.defineProperty(edge, 'id', {enumerable:false});
+    Object.defineProperty(edge, 'shape', {enumerable:false});
+
+    edge.defn('points', []);
 
     return edge;
   },
   
-  sync() {
-    if (!this.gameobject) return;
-    this.points = this.sample(this.samples);
-    cmd_edge2d(0, this.id, this.points);
-    cmd_edge2d(1, this.id, this._thickness * this.gameobject.scale);
-    this.coll_sync();
-  },
-
+  /* EDITOR */
   gizmo() {
     if (!this.hasOwn('cpoints')) this.cpoints = this.__proto__.cpoints.copy();
     
@@ -483,10 +482,32 @@ var bucket = clone(collider2d, {
     this.cpoints.forEach(function(x, i) {
       Debug.numbered_point(this.gameobject.this2world(x), i);
     }, this);
-    
-    this.sync();
   },
- 
+  
+  help: "Ctrl-click Add a point\nShift-click Remove a point\n+,- Increase/decrease spline segs\nCtrl-+,- Inc/dec spline degrees\nCtrl-b,v Inc/dec spline thickness",
+  
+  input_h_pressed() {
+    this.hollow = !this.hollow;
+  },
+  
+  input_m_pressed() {
+    if (Keys.ctrl()) {
+      this.mirrory = !this.mirrory;
+    } else {
+      this.mirrorx = !this.mirrorx;
+    }
+  },
+  
+  input_g_pressed() {
+    if (!Keys.ctrl()) return;
+    this.hollowt--;
+    if (this.hollowt < 0) this.hollowt = 0;
+  },
+
+  input_f_pressed() {
+    if (!Keys.ctrl()) return;
+    this.hollowt++;
+  },
 
   input_v_pressrep() {
     if (!Keys.alt()) return;
@@ -505,9 +526,7 @@ var bucket = clone(collider2d, {
   
   finish_center(change) {
     this.cpoints = this.cpoints.map(function(x) { return x.sub(change); });
-    this.sync();
   },
-  
 
   input_plus_pressrep() {
     if (Keys.ctrl())
@@ -602,12 +621,6 @@ var circle2d = clone(collider2d, {
   name: "circle 2d",
   radius: 10,
   offset: [0,0],
-  
-  get boundingbox() {
-    if (!this.gameobject) return null;
-    var radius = this.radius*2*this.gameobject.scale;
-    return cwh2bb(this.offset.scale(this.gameobject.scale), [radius, radius]);
-  },
 
   get scale() { return this.radius; },
   set scale(x) { this.radius = x; },
@@ -628,10 +641,16 @@ var circle2d = clone(collider2d, {
 
       set offset(x) { cmd_circle2d(1,this.id,this.offset); },
       get offset() { return cmd_circle2d(4,this.id); },
-      
+
+      get boundingbox() {
+        var diameter = this.radius*2*this.gameobject.scale;
+        return cwh2bb(this.offset.scale(this.gameobject.scale), [radius,radius]);
+      },
     });
 
     complete_assign(circle, this.make_fns);
+
+    circle.obscure('boundingbox');
     
     return circle;
   },
diff --git a/source/scripts/engine.js b/source/scripts/engine.js
index 300dfcf..de503b6 100644
--- a/source/scripts/engine.js
+++ b/source/scripts/engine.js
@@ -462,7 +462,11 @@ var Register = {
   },
 
   physupdates: [],
+  postphys_cbs: [],
   physupdate(dt) {
+    this.postphys_cbs.forEach(x => x());
+    this.postphys_cbs = [];
+    
     this.physupdates.forEach(x => x[0].call(x[1], dt));
   },
 
@@ -1071,6 +1075,11 @@ var Level = {
 	this.objects.push(loadedlevel);
 	return;
       }
+      var prototype = gameobjects[x.from];
+      if (!prototype) {
+        Log.error(`Prototype for ${x.from} does not exist.`);
+	return;
+      }
 
       var newobj = this.spawn(gameobjects[x.from]);
 
@@ -1263,14 +1272,8 @@ var gameobject = {
       this.layer = Nuke.radio(i, this.layer, i);
   },
 
-  _draw_layer: 1,
-  set draw_layer(x) {
-    if (x < 0) x = 0;
-    if (x > 4) x = 4;
-    this._draw_layer = x;
-    this.sync();
-  },
-  _draw_layer_nuke() {
+  draw_layer: 1,
+  draw_layer_nuke() {
     Nuke.label("Draw layer");
     Nuke.newline(5);
     for (var i = 0; i < 5; i++)
@@ -1281,8 +1284,6 @@ var gameobject = {
     return q_body(7, this.body);
   },
 
-  get draw_layer() { return this._draw_layer; },
-
   name: "gameobject",
 
   toString() { return this.name; },
@@ -1294,6 +1295,7 @@ var gameobject = {
     obj.defc('name', name);
     obj.from = this.name;
     obj.defn('instances', []);
+    obj.obscure('from');
 	
     return obj;
   },
@@ -1338,26 +1340,6 @@ var gameobject = {
   body: -1,
   controlled: false,
 
-  get properties() {
-    var keys = [];
-    for (var key of Object.keys(this)) {
-      if (key.startsWith("_"))
-        keys.push(key.substring(1));
-      else
-        keys.push(key);
-    }
-
-    return keys;
-  },
-
-  toJSON() {
-    var obj = {};
-    for (var key of this.properties)
-      obj[key] = this[key];
-
-    return obj;
-  },
-  
   set_center(pos) {
     var change = pos.sub(this.pos);
     this.pos = pos;
@@ -1479,6 +1461,8 @@ var gameobject = {
     return bb ? bb : cwh2bb([0,0], [0,0]);
   },
 
+  stop() {},
+
   kill() {
     Log.warn(`Killing ${this.toString()}`);
     cmd(2, this.body);
@@ -1502,13 +1486,6 @@ var gameobject = {
     this.stop();
   },
 
-  prop_obj() {
-    var obj = JSON.parse(JSON.stringify(this));
-    delete obj.name;
-    delete obj.from;
-    return obj;
-  },
-  
   get up() {
     return [0,1].rotate(Math.deg2rad(this.angle));
   },
@@ -1552,7 +1529,7 @@ var gameobject = {
     obj.toString = function() {
       var props = obj.prop_obj();
       for (var key in props)
-        if (typeof props[key] === 'object' && props[key].empty)
+        if (typeof props[key] === 'object' && !props[key] === null && props[key].empty)
 	  delete props[key];
 	  
       var edited = !props.empty;
@@ -1569,6 +1546,8 @@ var gameobject = {
     obj.sync();
     obj.defn('components', {});
 
+    cmd(113, obj.body, obj);
+
     complete_assign(obj, {
       set scale(x) { cmd(36, this.body, x); },
       get scale() { return cmd(103, this.body); },
@@ -1590,7 +1569,10 @@ var gameobject = {
       set friction(x) { cmd(108,this.body,x); },
 
       set mass(x) { set_body(7,this.body,x); },
-      get mass() { return cmd(
+      get mass() { return q_body(5, this.body); },
+
+      set phys(x) { set_body(1, this.body, x); },
+      get phys() { return q_body(0,this.body); },
     });
 
     for (var prop in obj) {