pub unsafe extern "C" fn manifold_smooth_by_normals(
mem: *mut c_void,
m: *mut ManifoldManifold,
normalIdx: c_int,
) -> *mut ManifoldManifold
pub unsafe extern "C" fn manifold_smooth_by_normals(
mem: *mut c_void,
m: *mut ManifoldManifold,
normalIdx: c_int,
) -> *mut ManifoldManifold