glsl faceforward
Faceforward.Returnavectorpointinginthesamedirectionasanother.Declaration.floatfaceforward(floatN,floatI,floatNref)vec2faceforward(vec2N ...,faceforwardorientsavectortopointawayfromasurfaceasdefinedbyitsnormal.Ifdot(Nref,I)
OpenGL ES 2.0 知识串讲(6)——GLSL 语法(IV)
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faceforward,传入三个参数,abc,假如b和c的点积小于0,返回a,否则返回-a。reflect函数,得到反射向量。refract函数,得到折射向量,这两个函数属于光照方面的函数 ...
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