def when_wavefront_created(self):
self.wavefront = WaveFront(self.triangles)
class TestWaveFront(unittest.TestCase):
"""
Test WaveFront Class
"""
def setUp(self):
self.wavefront = None
self.triangles = [
SphericalTriangle((Ray.right, Ray.forward, Ray.up)),
SphericalTriangle((Ray.right, Ray.down, Ray.forward)),
SphericalTriangle((Ray.left, Ray.forward, Ray.down)),
]
self.unit_sphere_volume_sequence = [
4.0 / 3.0,
2.942809041582063,
3.817729619828364,
4.091600620085994,
4.164203596248617,
]
self.volume_of_unit_sphere = 4.0 / 3.0 * pi # 4.1887902047863905
self.accepted_diameter = 0.2
self.orifice_diameter = 0.2
def tearDown(self):
self.wavefront = None
self.triangles = None;
self.unit_sphere_volume_sequence = None
self.volume_of_unit_sphere = None
self.accepted_diameter = None
self.orifice_diameter = None
def test_wave_front_normal_construction(self):
self.when_wavefront_created()
self.then_wavefront_has_normal_values()
def when_wavefront_created(self):
self.wavefront = WaveFront(self.triangles)
def then_wavefront_has_normal_values(self):
self.assertEqual(self.wavefront.triangles, tuple(self.triangles))
def test_wavefront_constructor_requires_triangle_collection(self):
with self.assertRaises(TypeError):
WaveFront(self.triangles + ["wrong stuff"])
def test_wavefront_unit_sphere_has_expected_values(self):
self.when_wavefront_set_to_unit_sphere()
self.then_wavefront_has_unit_sphere_content()
def when_wavefront_set_to_unit_sphere(self):
self.wavefront = WaveFront.unit_sphere
def then_wavefront_has_unit_sphere_content(self):
self.assertEqual(8, self.wavefront.count)
expected_volume = self.unit_sphere_volume_sequence[0]
self.assertAlmostEqual(expected_volume, self.wavefront.volume)
def test_wavefront_subdivision(self):
self.when_wavefront_set_to_unit_sphere()
self.then_sequence_of_subdivided_wavefronts_meet_expectations()
def then_sequence_of_subdivided_wavefronts_meet_expectations(self):
expected_volume_sequence = self.unit_sphere_volume_sequence[1:]
for depth, expected_volume in enumerate(expected_volume_sequence):
self.when_wavefront_is_subdivided()
self.then_wavefront_has_correct_count_for_depth(depth)
self.then_wavefront_converges_on_perfect_volume_from_below()
self.then_wavefront_has_expected_volume(expected_volume)
def when_wavefront_is_subdivided(self):
self.wavefront = self.wavefront.subdivide()
def then_wavefront_has_correct_count_for_depth(self, depth):
expected_count = 32 * 4 ** depth
self.assertEqual(expected_count, self.wavefront.count)
def then_wavefront_converges_on_perfect_volume_from_below(self):
perfect_volume = self.volume_of_unit_sphere
self.assertLess(self.wavefront.volume, perfect_volume)
def then_wavefront_has_expected_volume(self, expected_volume):
self.assertAlmostEqual(expected_volume, self.wavefront.volume)
def test_wavefront_refine_with_diameter_filter(self):
self.when_wavefront_set_to_unit_sphere()
self.when_wavefront_is_refined_by_diameter()
self.then_wavefront_has_expected_count_and_volume()
self.then_each_triangle_in_wavefront_has_refined_diameter()
def when_wavefront_is_refined_by_diameter(self):
def testfilter(triangle):
if triangle.diameter < self.accepted_diameter:
return TriangleClassification.Accept
else:
return TriangleClassification.Refine
self.wavefront = self.wavefront.refine_with_filter(testfilter)
def then_wavefront_has_expected_count_and_volume(self):
self.assertEqual(2048, self.wavefront.count)
self.assertAlmostEqual(self.unit_sphere_volume_sequence[4], self.wavefront.volume)
def then_each_triangle_in_wavefront_has_refined_diameter(self):
for triangle in self.wavefront:
self.assertLess(triangle.diameter, self.accepted_diameter)
def test_wavefront_refine_with_orifice_filter(self):
self.when_wavefront_set_to_unit_sphere()
self.when_wavefront_is_refined_by_orifice()
expected_volume = self.orifice_diameter ** 2
self.assertAlmostEqual(expected_volume, self.wavefront.volume, 3)
self.then_wavefront_points_up()
def when_wavefront_is_refined_by_orifice(self):
def testfilter(triangle):
orifice_center = Ray.up.endpoint.coordinates
orifice_diameter = self.orifice_diameter
vertex_a = triangle.a.endpoint.coordinates
vertex_b = triangle.b.endpoint.coordinates
vertex_c = triangle.c.endpoint.coordinates
a_length = vector_distance(vertex_a, orifice_center)
b_length = vector_distance(vertex_b, orifice_center)
c_length = vector_distance(vertex_c, orifice_center)
farthest_distance = max(a_length, b_length, c_length)
closest_distance = min(a_length, b_length, c_length)
if farthest_distance <= orifice_diameter:
return TriangleClassification.Accept
elif triangle.diameter < 0.01 or closest_distance >= orifice_diameter:
return TriangleClassification.Reject
else:
return TriangleClassification.Refine
self.wavefront = self.wavefront.refine_with_filter(testfilter)
def then_wavefront_points_up(self):
actual_direction = self.wavefront.central_direction.normalized()
expected_direction = Direction.up
disparity = vector_distance(actual_direction.xyz, expected_direction.xyz)
self.assertLess(disparity, 0.00000001)