Hi, I've just notice a strange behavior about using zOffset with materials. Works with Chrome and firefox : http://www.babylonjs-playground.com/#1NYKLE#3 (we see only the red sphere with material at zoffset = -1 The same playground in IE display the grey sphere. To make it works with IE, I have to put sphere2 material at zoffset = 1 (http://www.babylonjs-playground.com/#1NYKLE#4 ) Is that normal, or I'm missing something ? Sam