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Q: 

Regarding Image Based Lighting in GPU Gems 1

Does anybody know what the nearT value corresponds to in the pixel shader? Bjorke doesnt explain it anywhere in the article.

Also, there is a line;

float c = dot(IN.LightingPos,IN.LightingPos) - 1.0;

that I am not quite sure what the purpose of this would be. Is this actually a typo in the article?

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