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In geometry a vertex is a point defining the corners of polygons or intersections of lines. A triangle for example is defined by 3 vertices with lines between them. In 3D-graphical APIs like OpenGL and Direct3D a vertex is a data structure containing information about the positions, normals, colors, tangents etc of the points defining the triangular faces of 3D-meshes.

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First compute the edge normals as follows. Treat each edge e as a vector from one endpoint to the other (subtracting one endpoint from another). Then rotate edge e 90 degrees by multiplying by the rot …
answered Jul 3 '18 by Joseph O'Rourke