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並前往http://www.sohu.com/a/120584056_464041

使用随机采样实现soft shadow

sum+= textureProj(ShadowMap,sc);. sc.xy= ShadowCoord.xy+ offsets.zw;. sum+= textureProj(ShadowMap,sc);. } floatshadow= sum/ 8.0;.

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