I'm trying to load an OBJ in the playground.  There are 2 meshes in the OBJ with exact same number of vertices.  This works in normal code when I use BABYLON.SceneLoader.Load() but when I use this special playground technique I get funny side-effects.  One of the meshes is twice the number of vertices as the other one: http://www.babylonjs-playground.com/#28YUR5#202  You can see it in the console output. Is there another way to load an OBJ in the playground?