PBR, alpha and transparency

Hi,

The last build has some changes in the way PBR Materials are rendered with transparency

http://playground.babylonjs.com/index.html#VXEHT4#1

http://playground.babylonjs.com/indexstable.html#VXEHT4#1

In the last build, you need to indicate the Material requires transparency (transparencyMode) to have it blended with the background. Seems like in the last stable version it was its default behaviour. Is it intended ?

Thanks a lot for your inputs, have a nice day !