| Legacy VTK file format writer.
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| Note: bug in vtk displaying wedges? Seems to display ok if we decompose them. Should be thoroughly tested! (they appear rarely in polyhedral meshes, do appear in some cut meshes)
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| Write faceSet to vtk polydata file. Only one data which is original faceID.
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| Write pointSet to vtk polydata file. Only one data which is original pointID.
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| Write a patch with its data.
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