Marching cubes/squares?
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I haven't seen much research in isosurfacing/surface reconstruction recently as I think it's all pivoted to ray tracing, but the most feature complete algorithm I've seen is "Isosurfaces Over Simplicial Partitions of Multiresolution Grids"
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You probably came across iq's 2020 SDF page. Option 4 is a good approach for 2D polygons, assuming that's your requirements https://www.iquilezles.org/www/articles/interiordistance/interiordistance.htm …
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Oh wait, you're going from SDF to polygons! That's a very different problem. Are you looking at isotopic lines or contour reconstruction algorithms?
End of conversation
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