init

tests/test_sphere.py

@@ -0,0 +1,22 @@
+import numpy as np
+
+from ray import Ray
+from sphere import Sphere
+from vector import Vector
+
+
+def test_intersect():
+  sphere = Sphere(
+    r0=Vector.fromargs(0, 0),
+    radius=1,
+  )
+
+  assert sphere.intersect(Ray(
+    r0=Vector.fromargs(-2, 0),
+    e=Vector.fromargs(1, 0),
+  )) == 1
+
+  assert sphere.intersect(Ray(
+    r0=Vector.fromargs(-1, -1),
+    e=Vector.fromargs(1, 1),
+  )) == np.sqrt(2) - 1