added some fun models; added some untested code to implement absorption, scattering, reflection, and refraction

1 files changed, 29 insertions, 0 deletions

diff --git a/sample.py b/sample.py
new file mode 100644
index 0000000..b494384
--- /dev/null
+++ b/sample.py
@@ -0,0 +1,29 @@
+import numpy as np
+
+def uniform_sphere(size=None, dtype=np.double):
+    """
+    Generate random points isotropically distributed across the unit sphere.
+
+    Args:
+        - size: int, *optional*
+            Number of points to generate. If no size is specified, a single
+            point is returned.
+
+    Source: Weisstein, Eric W. "Sphere Point Picking." Mathworld. 
+    """
+
+    theta, u = np.random.uniform(0.0, 2*np.pi, size), \
+        np.random.uniform(-1.0, 1.0, size)
+
+    c = np.sqrt(1-u**2)
+
+    if size is None:
+        return np.array([c*np.cos(theta), c*np.sin(theta), u])
+
+    points = np.empty((size, 3), dtype)
+
+    points[:,0] = c*np.cos(theta)
+    points[:,1] = c*np.sin(theta)
+    points[:,2] = u
+
+    return points