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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
PDF) Adaptive and robust curve smoothing on surface meshes
Subdivision Surface Modifier — Blender Manual
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Mesh generation - Wikipedia
Fusion 360 Help, Convert a mesh body to a solid body
a. Tri mesh before smoothing
211 questions with answers in MESH GENERATION
A hexahedral-dominant FE meshing technique using trimmed hexahedral elements preserving sharp edges and corners
a) Surface geometry and inner anatomy of the nasal airway of an adult;
ISpliter: an intelligent and automatic surface mesh generator using neural networks and splitting lines, Advances in Aerodynamics