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Vizualizer for the angle between planar primitives

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Any idea how I could vizualize the  angle between planar primitives ?
It seems pretty straightforward to me, something like copy sliced circle arcs to the midpoints of the shared edges, and get the orientation right. Essentially an edge attribute.

Edited by AntoineSfx

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I think your first step is find a way to traverse faces, i.e. for a given face A, what are the faces neighboring it?  having this information you can start computing differences in face normals. Also, I "think" there is an interinsic primitive that has face normal, but I am not sure.

Another idea is to measure surface curvature --> would give you approximate info about if angles are changing or not...

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