[vtkusers] CW and CCW filtering

[Meisam Aliroteh]

Hi everyone,

I was wondering if there is a vtk filter that can fix cell orientations. I
have OBJ models that I load using vtkOBJReader, but the cell orientations
are mixed. Some of the triangular faces are clockwise and some are
counter-clockwise. I need a way to unify the orientation of all cells such
that they all face clock-wise or counter-clockwise. By the way, my models
are always built up of triangular patches (no strips or quads).

Does anyone know how to do this ? !
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