Add fog to Lighting.j3md

[JaRe]

see also my solution:

@JaRe

If I in the shader already retract the position in the 3d space, then the implementation of the nebulization is almost forced:

I just have to calculate the distance to the camera to know the intensity of the cloud. And since I also know “y”, I can represent the cloud as a gradient. Dark and somewhat moddy below, rather light gray above.

My simple fog with JME3