Mesh internal surface smoothing behavior changed in vtkWindowedSincPolyDataFilter - Support - VTK

It seems that the rewrite of vtkWindowedSincPolyDataFilter (that amazingly improved its performance) also changed how internal surfaces are smoothed. Smoothing of internal surfaces are important because when we segment a medical image we usually annotate many adjacent structures that have common surfaces and when we apply smoothing then we want to smooth surface of each structure and not just the outer surface of the entire segmented region. The old version (VTK8) smoothed the internal surfaces

VTK: vtkWindowedSincPolyDataFilter Class Reference

VTK 9: Surface smoothing prevent segments from being shown in 3D · Issue #5223 · Slicer/Slicer · GitHub

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PDF) The VTK User's Guide 11th Edition Contributors

Feature Request - Support for POLYDATA in vtk format · Issue #527 · nschloe/meshio · GitHub

Point Cloud Library (PCL): pcl::MeshSmoothingWindowedSincVTK Class Reference

Unable to use filters in a 3d mesh - ParaView Support - ParaView

vtkWindowedSincPolydataFilter not affecting polydata · Issue #2082 · Kitware/vtk-js · GitHub

PDF) The VTK User's Guide 11th Edition Contributors

Surface Reconstruction By VTK And CGAL – weiy