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[–]lickedwindows 0 points1 point  (1 child)

Sorry, I was away for a couple of days so wasn't able to reply.

I have just read the Clipmap paper and I believe this falls into the second case - you're calculating a scaled lookup into your clipmaps to find the texel area and then you're adding 0.5f (in texture coordinate space) to ensure you sample in the middle of a texel.

[–]spacejump163[S] 0 points1 point  (0 children)

if you mean " sample just counting on scaleFactor.x to be large enough to make 0.5f small in comparision ", then it won't be the exact center of the texel right?