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I was recently sent to Algorithms for calculating vertex normals in 2D polygon via the newsletter, it seemed like an interesting problem so I took a shot at it and got an accepted answer. I later stumbled across the same question asked by the same user on stack overflow, I've commented with a link on the question above, but I guess I was wondering what the policy on this is? It seems like it could be on topic on both sites, and it looks like there are good answers on both, so perhaps tis isn't an issue?

On the other hand it seems like most of the technical questions on this site would be on topic on Stack Overflow, so is it right to try and decide to post on the one which seems like the best fit, or should it actually be encouraged to cross-post?

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