November 18th, 2010, 07:01 AM  #1 
Newbie Joined: Nov 2010 Posts: 1 Thanks: 0  3D vertex
I would like to know, in a 3D polyhedron, how to know if a vertex is concave or convex. What is the procedure for determining whether a vertex is concave or convex? Must be something related to angles, cross product... Thanks in advance. 

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