def mesh_from_set_of_faces():
A, B, C, D = (0, 0, 0), (1, 0, 0), (0, 1, 0), (1, 1, 0)
# Two triangular faces
faces = {frozenset({A, B, C}), frozenset({B, C, D})}
mesh = Mesh.from_set_of_faces(faces)
assert mesh.nb_vertices == 4
assert mesh.nb_faces == 2
assert mesh.is_triangle(0) and mesh.is_triangle(1)
def test_as_set_of_faces():
"""Test the representation of the mesh as a set of faces.
Also allows to define the equality of two meshes."""
faces = cylinder.as_set_of_faces()
assert isinstance(faces, frozenset)
assert len(faces) == cylinder.nb_faces
assert all(len(face) == 4 or len(face) == 3
for face in faces) # Each face is represented by 3 or 4 points
assert all(
len(vertex) == 3 for face in faces
for vertex in face) # Each point is represented by 3 coordinates.
assert cylinder == cylinder # The equality is defined as the equality of the set of faces.
assert Mesh.from_set_of_faces(
faces
) == cylinder # The mesh can be reconstructed from a set of faces.
