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: how to smooth surface? - Support - VTK
Splitting cells on a PolyData - Support - VTK
Surface mesh with multiple scalar data - Support - 3D Slicer Community
vtk: how to smooth surface? - Support - VTK
VT K Users Guide, PDF, Scientific Modeling
vtk surface mesh to segmentation - Support - 3D Slicer Community
VT K Users Guide, PDF, Scientific Modeling
VTK 9: Surface smoothing prevent segments from being shown in 3D · Issue #5223 · Slicer/Slicer · GitHub
VTK: vtkPolyDataEdgeConnectivityFilter Class Reference
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VTK: vtkWindowedSincPolyDataFilter Class Reference
How to highlight a smooth region on a polygonal mesh - Support - VTK
vtkWindowedSincPolyDataFilter · Issue #1467 · Kitware/vtk-js · GitHub
