pbrt gamma
inline Float gamma(int n) {
return (n * MachineEpsilon) / (1 - n * MachineEpsilon);
}
src\core\pbrt.h
PBRT笔记(13)——光线传播1:表面反射
https://blog.csdn.net/weixin_34138377/article/details/93348870
PBRT笔记(9)——贴图
https://www.cnblogs.com/blueroses/p/10563198.html