unity,UNITY_PROJ_COORD和tex2Dproj
看ProjectorMultiply.shader,有这么一句:
fixed4 texS = tex2Dproj (_ShadowTex, UNITY_PROJ_COORD(i.uvShadow));
查了一下:
UNITY_PROJ_COORD:given a 4-component vector, return a texture coordinate suitable for projected texture reads. On most platforms this returns the given value directly.
参考:https://docs.unity3d.com/412/Documentation/Components/SL-BuiltinMacros.html
tex2Dproj:either by explicitly dividing x and y by w or by using tex2Dproj.
参考:https://en.wikibooks.org/wiki/Cg_Programming/Unity/Projectors
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