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Geometry Clipmaps

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I'm reading the original paper and I'm getting troubles understanding the difference between active_region() and clip_region(). What I've understood is that ideally (when there's no motion) clip and active regions are the same, the vertex we want to render, but when there's fast motion the active region buffer may not be fullfilled due to time-limit constraint. That's why it's different on the paper's fig. 2 on page 3. Am I right? or I'm totally wrong. My bad understanding maybe because of my poor level of english.

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I think that's more or less right. I'm implementing the GPU version at the moment (you can find the paper here) which abandons the partial update scenario for simplicity, each level is either completely updated or not updated at all and levels are updated in coarse to fine order so they simply drop the finer levels if they have not been updated.

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