Unity 3D Procedural Skybox (soon available in Unity Asset Store)
This Skybox has been designed to replace the standard built-in procedural skybox in Unity 3D.
The atmospheric effects are rendered using precomputed atmospheric scattering technique as described in "BRUNETON E., NEYRET F.: Precomputed Atmospheric Scattering. In Eurographics Symposium on Rendering (2008)"