H-basis/sg/sh GI relighting

A little try to calculate the global illumination as a superior application of PRT. Completely self-realization, using sg/sh, h-basis fundamental to the GI light field of frequency-domain compression, there is 3D texture, for 2-hop indirect illumination real-time display. A lot of pits, especially in the HDR environment using different low-frequency baseband truncation approximation, there will be a considerable number of problems, fortunately all the way. There are no other effects such as the combination of screen space lighting. After testing, the large-scale effect has reached the level of equivalence with Unity3d.

H-basis/sg/sh GI relighting