咦,不是有一节就是专门说这个事的吗? M 4?3 l 我也是刚学,不过,先看了下,应该还好明白的吧, GTvb^+6 哦,不过,我也没有细看的, +[DVD 只是看了下BSDF的定义拉, giq` L1< 说的不对,请多多见凉啊
roadwu
2005-09-09 18:10
如下是帮助里提供的定义 _v,n~a}& BRDF：Bi-directional Reflectance Distribution Function. It is the scattered radiance from a surface (reflective scattering) per unit incident Irradiance, and thus has units of inverse steradians (1/sr). The BRDF is defined as the differential scattered radiance per unit incident Irradiance. de=T7,G# BSDF：Bi-directional Scattering Distribution Function and is a generic term which is used to refer to BRDF and BTDF. ii s cm\ BTDF：Bi-directional Transmittance Distribution Function. It is the scattered radiance through a surface per unit incident Irradiance. n]!H,Q1,T -nSqB{s!SD 具体参数怎么选取需要自己去多尝试，手册里虽然有公式，但很抽象。