I have a low-quality mesh, I want to remesh it but keeping the topology(only adjust the vertex position, keep vertex size, face unchanged). Is there an exist method could do this in CGAL?
There is a remesher in CGAL. However, it will recreate a surface with its own vertices and faces number, depending on the criteria you ask for. You can give it a try by compiling the Surface_mesher demo or using the precompiled windows demo (you need this and this).