Atmosphere (Iteration 4)

Once the basis was done, its time of improvement.

• Underwater ambient lighting. I noticed I completely forgot the ambient term, so I did some kind of bounce lighting to lit the objects downside 

• Caustics animation and "diffraction"

• "Anisotropic" reflections

• Depth fading. This was a lot of work. Basically, I had to recreate some UDK nodes, SceneColorTexture, SceneDepth and PixelDepth. 

The idea is simply:

Later I use this information to turn down Scene distortion or reflections, turning into this:

Not fixed result:

• Added 2D clouds. To allow this little feature, I had to move the complex sky scattering to a skydome, because it was a postprocess, and this method enters in conflict with alpha blended shaders. So now, complex sky is in a dome in conjunction with the clouds texture. Now only exponential height fog remains as postprocess. 

It also has a first approximation for lighting. Will be improved later.

Video!