Parallax demo js error

Hi guys, first post here, babylonjs is pretty awesome !

There is an undefined variable (normalsHeightTexture) in your parallax playground demo : http://babylonjs-playground.com/#10I31V#8. This breaks the update of the renderMode...

I've made a fixed version here : http://babylonjs-playground.com/#10I31V#23

There is a link to the broken demo in the associated tutorial here : https://doc.babylonjs.com/tutorials/Using_parallax_mapping (but It may be elsewhere too).

Thanks !