how can I simplify a specific region of 3d mesh using CGAL

Question

I'm using CGAL Surface Mesh Simplification to simplify 3d mesh from .off file was read as Linear_cell_complex_for_combinatorial_map and undo the edges collapsing (simplification) using undo_edge_collapse_surface_mesh.

How to do the simplification and undo processes within specific selected region on the mesh.

any recommendations ,please?

Answer 1

You can constrain some edges such that they will not be removed by passing an edge --> bool map in argument.

See the named parameter is_constrained_edge_map in the documentation of the edge_collapse() function and this CGAL example for an example of usage. In your case, you would just loop over the edges of your regions and constrain them.