Add vtkDataSetRegionSurfaceFilter to VTK.
Like vtkDataSetSurfaceFilter, vtkDataSetRegionSurfaceFilter is a filter that extracts the surface from a dataset. Unlike vtkDataSetSurfaceFilter, the filter accepts integer cell data to denote regions; the regions are then used as an additional criterion for determining surfaces. This filter has been ported from ParaView's VTKExtensions.
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