Precomputed Atmospheric Scattering Demo PostMortem

Video and demo of my implementation of the paper Precomputed Atmospheric Scattering.
This technique is very fast to evaluate on GPU's because it relies solely on precomputation and lookup tables.
DEMO CONTROLS :
Controls : mouse + Z/S/Q/D (on azerty keyboards) move the camera in freelook mode.
PAD 8 / PAD 2 , advance very fast ( permitt to take off and be in space ;-) )
W/X rotate sun direction.

Precomputed atmospheric scattering as described by Nishita93

Always in my research upon scattering of light rendering techniques, i implement this paper with some modifications, i use a volume texture instead of sampling planes and raycast against a sphere inside pixel shader to determine the lookup parameters.
I decided to compute on CPU for easy stream of calculation and eventual ports to PS3 :)

Actually only rayleigh scattering is displayed but it's a good start.