outer_hull function removes most of the mesh after remesh_self_intersection

[Jarelk]

To prep for tetrahedralisation, I am remeshing the self intersections according to the documentation. However, the outer_hull() function removes most of the mesh, which results in a bad end result. Can anyone help identify the cause?

Here is the relevant code block:

void INFOMR::Remesh::__removeSelfIntersections(MatrixXd& V, MatrixXi& F)
{
	igl::copyleft::cgal::RemeshSelfIntersectionsParam params;
	params.detect_only = false;
	Eigen::MatrixXd SV, VV, FinalV;
	Eigen::MatrixXi SF, FF, IF, FinalF, flip;
	Eigen::VectorXi J, IM, UIM;
	igl::copyleft::cgal::remesh_self_intersections(V, F, params, VV, FF, IF, J, IM);
	std::for_each(FF.data(), FF.data() + FF.size(), [&IM](int& a) {a = IM(a); });
	igl::remove_unreferenced(VV, FF, SV, SF, UIM);
	igl::copyleft::cgal::outer_hull(SV, SF, FinalV, FinalF, J, flip);
	V = FinalV;
	F = FinalF;
}

Before:

After: