def test_cut_sphere(self):
mesh = generate_icosphere(1.0, np.zeros(3))
self.assertEqual(2, mesh.euler_characteristic)
mesh = cut_to_disk(mesh)
num_bd_loops = mesh.num_boundary_loops
self.assertEqual(0, num_bd_loops)
self.assertEqual(2 - num_bd_loops, mesh.euler_characteristic)
def test_cut_tube(self):
mesh = generate_tube(np.zeros(3), np.ones(3), 1.0, 0.5, 1.0, 0.5)
self.assertEqual(0, mesh.euler_characteristic)
mesh = cut_to_disk(mesh)
num_bd_loops = mesh.num_boundary_loops
self.assertEqual(1, num_bd_loops)
self.assertEqual(2 - num_bd_loops, mesh.euler_characteristic)
def test_cut_nonmanifold(self):
vertices = np.array([
[0.0, 0.0, 0.0],
[1.0, 0.0, 0.0],
[0.5, 0.0, 1.0],
[0.5, 1.0, 0.0],
[0.5, 1.0, 1.0],
])
faces = np.array([
[0, 1, 2],
[0, 1, 3],
[0, 1, 4],
])
mesh = form_mesh(vertices, faces)
self.assertFalse(mesh.is_manifold())
# Note that nonmanifold input mesh is not supported.
mesh = cut_to_disk(mesh)
self.assertTrue(mesh.is_manifold())