I have a complex mesh that I have imported from a .obj file. I would like to check whether it is genus-0, i.e. whether there are any holes in the object. If there are such holes I need to fix them. I have tried searching by eye but it appears there must be rather small holes that are not obvious on inspection.
When I search for things like "Blender fill holes" the results appear to relate to holes in the mesh itself, i.e. involving edges that only have a single adjacent face. This is not what I am trying to do. For example, the standard mesh "Torus" has no holes in its mesh, but it has a big hole in the object itself, which is the kind of thing that I need to be able to fix.