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comment Explanation of this image warping (bulge filter) algorithm
aha, polar coordinate system was the buzz-phrase I've been looking for it seems! Thanks very much! Two additional questions: 1. where does rn=2r^(2.5) come from? 2. What is the order of operations from the original post where rn is given as rn=2r^2.5/0.5? I assume the division by 0.5 effects the horizontal and vertical shift you mentioned, but is the actual order 2r^(2.5/0.5) or (2r^2.5)/0.5? The first form gives 'nicer' numbers since 2.5/0.5=5...