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Bill Lorensen authored
There is a singularity when v = 0. This patch checks for v = 0 and replaces it with a small number, .05. A new ivar DeltaV0 can change this value. This bug was noticed when running the VTK wiki example: Cxx/GeometricObjects/ParametricObjectsDemo2. While rotating the camera for the Kuen surface, the center of rotation appeared off. The z-coordinate was NAN for points when v == 0. Also, the ordering of triangles was incorrect.
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