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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. ...

texture pbr filtering gaussian-blur
 
 
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8:09 PM
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Q: Geometric interpretation of this bilinear interpolation equation?

Alan WolfeBilinear interpolation can be achieved by interpolating two values across the x axis, and then interpolating between the results across the y axis, like in the image below (from https://blog.demofox.org/2015/04/30/bilinear-filtering-bilinear-interpolation/) A way to write this mathematically i...

mathematics interpolation
 

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