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Minimum distance between two sets of polygons

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I have two sets of polygons (i.e. {PolyA, PolyB, PolyC}, {PolyD, PolyE, PolyF}). In MOST cases, at least one of them will be a single polygon, but this isn't always true. They can be concave. I'm trying to find the best algorithm to determine the minimum distance between the polygons. I see algorithms for point to poly, poly overlap, poly distance, but not "multi-poly to multi-poly minimum distance"... Does anyone have pointers, algorithm names, or other hints? Speed is important obviously, but it's not happening 1,000 times per second or anything. Thanks very much! [Edited by - djMaxM on December 31, 2007 4:04:54 PM]

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