You're right...the algorithm that I outlined works for convex polygons. In order to deal with polygons with concavities, I believe that you need to allow for overlap and take the union of all points that lie in the interior. In the case of the polygon that you gave, it would then be a square. Just for my own edification, what is the $d that you're referring to?

thor

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Be your own disciple, fan the sparks of will
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In reply to Re^3: polygon buffering algorithms by thor
in thread polygon buffering algorithms by punkish

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