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I'm trying to implement FS that would make nonlinear transform of solids and surfaces. I'm using evFaceTangentPlanes() to get face parametrization and faced a problem - in some cases (especially for planar faces) a pair of internal parameters (u,v) gives a point within face, but in some other cases the point appears on the face propagation and doesn't belong to the face itself. is it the correct behavior? because i would expect face parametrization to return only points within the face.