def teste_hit3(self):
s = sphere()
i1 = intersection(-1, s)
i2 = intersection(-2, s)
xs = intersections(i1, i2)
i = hit(xs)
self.assertIsNone(i, 'There should be no hit')
def teste_hit2(self):
s = sphere()
i1 = intersection(-1, s)
i2 = intersection(1, s)
xs = intersections(i1, i2)
i = hit(xs)
self.assertEqual(i, i2, 'The first hit is wrong')
def test_sphere_intersections(self):
s = sphere()
i1 = intersection(1, s)
i2 = intersection(2, s)
xs = intersections(i1, i2)
self.assertEqual(len(xs), 2, 'There should be 2 intersections')
self.assertEqual(xs[0].t, 1, 'The first intersection time should be 1')
self.assertEqual(xs[1].t, 2,
'The second intersection time should be 2')
def teste_hit4(self):
s = sphere()
i1 = intersection(5, s)
i2 = intersection(7, s)
i3 = intersection(-3, s)
i4 = intersection(2, s)
xs = intersections(i1, i2, i3, i4)
i = hit(xs)
self.assertEqual(i, i4, 'The first hit is wrong')