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Q: Texture prefiltering for Linearly Transformed Cosines

DeragI'm implementing Real-Time Polygonal-Light Shading with Linearly Transformed Cosines from Siggraph 2016. I'm stuck on the texture prefiltering (section 5.3). As I understand they use Gaussian Blur on the texture, but clamp and normalize kernel to fragments that intersect the original texture. ...

 

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