diff --git a/scripts/base.js b/scripts/base.js
index 9bfe8d7..21acb7c 100644
--- a/scripts/base.js
+++ b/scripts/base.js
@@ -54,11 +54,10 @@ Object.rkeys = function(o)
   return keys;
 }
 
-Object.extend = function(from, src)
+Object.extend = function(from)
 {
   var n = {};
   Object.mixin(n, from);
-  Object.mixin(n, src);
   return n;
 }
 
@@ -69,6 +68,15 @@ Object.mixin = function(target, source)
   return target;
 };
 
+Object.mix = function(...objs)
+{
+  var n = {};
+  for (var o of objs)
+    Object.mixin(n,o);
+
+  return n;
+}
+
 Object.deepmixin = function(target, source)
 {
   var o = source;
diff --git a/scripts/components.js b/scripts/components.js
index 2012766..1fb54d4 100644
--- a/scripts/components.js
+++ b/scripts/components.js
@@ -1,7 +1,7 @@
 function assign_impl(obj, impl)
 {
   var tmp = {};
-  for (var key in impl)
+  for (var key of Object.keys(impl))
     if (typeof obj[key] !== 'undefined' && typeof obj[key] !== 'function')
       tmp[key] = obj[key];
 
@@ -337,12 +337,13 @@ var collider2d = Object.copy(component, {
   impl: {
     set sensor(x) { cmd(18,this.shape,x); },
     get sensor() { return cmd(21,this.shape); },
-//    set enabled(x) { cmd(22,this.shape,x); },
-//    get enabled() { return cmd(23,this.shape); }
+    set enabled(x) { cmd(22,this.shape,x); },
+    get enabled() { return cmd(23,this.shape); }
   },
-
 });
 
+Object.hide(collider2d.impl, 'enabled');
+
 collider2d.inputs = {};
 collider2d.inputs['M-s'] = function() { this.sensor = !this.sensor; }
 collider2d.inputs['M-s'].doc = "Toggle if this collider is a sensor.";
@@ -415,17 +416,14 @@ component.polygon2d = Object.copy(collider2d, {
   },
 });
 
-component.polygon2d.impl = {
-    set sensor(x) { cmd(18,this.shape,x); },
-    get sensor() { return cmd(21,this.shape); },
-
+component.polygon2d.impl = Object.mix(collider2d.impl, {
   sync() {
     cmd_poly2d(0, this.id, this.spoints);
   },
   query() {
     return cmd(80, this.shape);
   },
-};
+});
 
 var polygon2d = component.polygon2d;
 
@@ -585,10 +583,7 @@ component.edge2d = Object.copy(collider2d, {
   },
 });
 
-component.edge2d.impl = {
-  set sensor(x) { cmd(18,this.shape,x); },
-  get sensor() { return cmd(21,this.shape); },
-
+component.edge2d.impl = Object.mix({
   set thickness(x) {
     cmd_edge2d(1,this.id,x);
   },
@@ -600,7 +595,7 @@ component.edge2d.impl = {
     cmd_edge2d(0,this.id,points);
     this.sensor = sensor;
   },
-};
+}, component.edge2d.impl);
 
 var bucket = component.edge2d;
 bucket.spoints.doc = "Returns the controls points after modifiers are applied, such as it being hollow or mirrored on its axises.";
@@ -728,10 +723,7 @@ component.circle2d = Object.copy(collider2d, {
   _enghook: make_circle2d,
 });
 
-component.circle2d.impl = {
-    set sensor(x) { cmd(18,this.shape,x); },
-    get sensor() { return cmd(21,this.shape); },
-
+component.circle2d.impl = Object.mix({
   set radius(x) { cmd_circle2d(0,this.id,x); },
   get radius() { return cmd_circle2d(2,this.id); },
 
@@ -740,7 +732,7 @@ component.circle2d.impl = {
 
   set offset(x) { cmd_circle2d(1,this.id,x); },
   get offset() { return cmd_circle2d(3,this.id); },
-};
+}, collider2d.impl);;
 
 /* ASSETS */
 
diff --git a/scripts/physics.js b/scripts/physics.js
index a1fa7ec..e384b97 100644
--- a/scripts/physics.js
+++ b/scripts/physics.js
@@ -1,3 +1,15 @@
+/* On collisions, entities are sent a 'hit' object, which looks like this: */
+var HIT = {
+  normal: "The normal of the collision point.",
+  hit: "The gameobject ID of the object that collided.",
+  sensor: "Boolean for if the colliding object was a sensor.",
+  velocity: "Velocity of the contact.",
+  pos: "Position in world space of the contact.",
+  depth: "Depth of the contact.",
+  id: "Gameobject ID of the colliding object.",
+  obj: "Entity that collided."
+};
+
 var Physics = {
   dynamic: 0,
   kinematic: 1,
diff --git a/source/engine/2dphysics.c b/source/engine/2dphysics.c
index 1a3b68b..140772c 100644
--- a/source/engine/2dphysics.c
+++ b/source/engine/2dphysics.c
@@ -562,9 +562,9 @@ void phys2d_dbgdrawedge(struct phys2d_edge *edge) {
 /************ COLLIDER ****************/
 void shape_enabled(struct phys2d_shape *shape, int enabled) {
   if (enabled)
-    cpShapeSetFilter(shape->data, CP_SHAPE_FILTER_ALL);
+    cpShapeSetFilter(shape->shape, CP_SHAPE_FILTER_ALL);
   else
-    cpShapeSetFilter(shape->data, CP_SHAPE_FILTER_NONE);
+    cpShapeSetFilter(shape->shape, CP_SHAPE_FILTER_NONE);
 }
 
 int shape_is_enabled(struct phys2d_shape *shape) {
@@ -588,7 +588,7 @@ int shape_get_sensor(struct phys2d_shape *shape) {
   if (!shape->shape) {
     struct phys2d_edge *edge = shape->data;
     if (arrlen(edge->shapes) > 0) return cpShapeGetSensor(edge->shapes[0]);
-    YughError("Attempted to get the sensor of an edge with no shapes. It has %d points.", arrlen(edge->points));
+    YughInfo("Attempted to get the sensor of an edge with no shapes. It has %d points.", arrlen(edge->points));
     return 0;
   }
 
diff --git a/source/engine/2dphysics.h b/source/engine/2dphysics.h
index 1bdbab3..d72e9dc 100644
--- a/source/engine/2dphysics.h
+++ b/source/engine/2dphysics.h
@@ -24,7 +24,7 @@ extern struct rgba sleep_color;
 struct phys2d_shape {
   cpShape *shape;
   int go;
-  void *data;
+  void *data; /* The specific subtype; phys2d_circle, etc */
   void (*debugdraw)(void *data);
   float (*moi)(void *data, float mass);
   void (*apply)(void *data);