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it would be good to have an option for drawing normals of an OF mesh, for debugging purposes, etc. It could be a debug draw mode, like drawWireFrame(), ie:
drawNormals(float scaleAmount = 1.0);
this kind of things is constantly re-implemented by various MeshUtils and MeshHelper function collections. it would be great to compile these kind of functions into the core.
this is done by of3dPrimitive already