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
2D supersonic inlet – Meshing
Sustainability, Free Full-Text
Fusion 360 Help, Convert a mesh body to a solid body
Meshing the NASA High Lift Common Research Model with Fidelity Pointwise
Using NURBS vs. Mesh: Why Both Are Needed, System Analysis Blog
Solved: possible to TurboSmooth while protecting borders? - Autodesk Community - 3ds Max
Finite element modelling of defects in additively manufactured strut-based lattice structures - ScienceDirect
A dynamically reprogrammable surface with self-evolving shape morphing
a. Tri mesh before smoothing