parallax corrected cubemap

https://seblagarde.wordpress.com/2012/09/29/image-based-lighting-approaches-and-parallax-corrected-cubemap/

https://seblagarde.files.wordpress.com/2012/08/parallax_corrected_cubemap-siggraph2012.pdf

https://armkeil.blob.core.windows.net/developer/Files/pdf/graphics-and-multimedia/ImplementingReflectionsinUnityUsingLocalCubemaps.pdf

camera放在camPos 生成一个local cubemap

box设置在 比如湖面的边界 

Pos沿R的方向 的distance

dis= (A-O)/D

   =(IntersectPosWS-Pos)/R

parallax corrected cubemap

原文：https://www.cnblogs.com/minggoddess/p/8809771.html