all-pass filter?
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It's an example of Milne-Thomson's circle theorem. If you take the location of each vortex in a potential flow, invert it in a circle and add an opposing vortex there, the circle is a streamline in the resulting flow.
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OH I KNOW WHAT THIS IS its gotta do something with, if u have a field of r(x, y) then u can find the field of θ(x, y) by like θ(x, y) = tan⁻¹(dr/dx÷dr/dy) its how u approximate the surface normal for a arbitrarhy SDF in 3D for raymarching direction is the derivative of distance
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