I have 3D polygon: solid (first case) and plane (second case). How to determine master point (key point)? Ex.: master points of a cylinder are the centers of its caps.
I can't use convex hull algorithm because master point can be a part of a hull and I can't check it with the plain (2D) polygon algorithm because the surface can be arched.
I will enjoy any links to read about the question or straightforward answers.
You can try alphashapes. Its a delaunay triangulation without edges exceeding alpha.