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 xx and yy by ww or by using tex2Dproj.

参考:https://en.wikibooks.org/wiki/Cg_Programming/Unity/Projectors

posted on   wantnon  阅读(6764)  评论(0编辑  收藏  举报

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