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

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

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Extract closed Surface or Generate 3D mesh or volume from two non-closed surface - Support - VTK

Add support for Taubin smoothing · Issue #2814 · pyvista/pyvista · GitHub

VTK: vtkWindowedSincPolyDataFilter Class Reference

Feature request: add ACVD uniform remeshing filter - Development - VTK

Smooth — MfxVTK documentation

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

Extract closed Surface or Generate 3D mesh or volume from two non-closed surface - Support - VTK