looks a lot like perspective projection. Also, see the plenoptic function
Does this map from outside to inside of a circle have a name? (r,θ)→(1/|r-R|, θ), r≠R (generalized to sphere is of interest too)
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That looks weird to me - you want something different from the standard circular inversion?
Thanks. Twitter will use this to make your timeline better. UndoUndo
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