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How to detect concave or convex surface on 3D mesh?

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Hello all, Is there a way that I can differentiate concave from convex surface on a 3D mesh? Thank you -Danyu

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If you are using a mesh, you can check a vertex: if any of the vectors to adjacent vertices have a positive dot product with the vertex normal, then there is a concavity (although possibly only on one axis).

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