Collision Map is returned and default values added.

Author: photonstorm

v3/src/physics/impact/CollisionMap.js

@@ -9,9 +9,11 @@ var CollisionMap = new Class({
 
     function CollisionMap (tilesize, data)
     {
+        if (tilesize === undefined) { tilesize = 32; }
+
         this.tilesize = tilesize;
 
-        this.data = data;
+        this.data = (Array.isArray(data)) ? data : [];
 
         this.width = (Array.isArray(data)) ? data[0].length : 0;
         this.height = (Array.isArray(data)) ? data.length : 0;

v3/src/physics/impact/World.js

@@ -96,7 +96,7 @@ var World = new Class({
     {
         this.collisionMap = new CollisionMap(tilesize, data);
 
-        return this;
+        return this.collisionMap;
     },
 
     /**