Code documentation.

60832df3 · Ilya Portnov · 0ffd2617 · 60832df3
--- a/utils/surface/algorithms.py
+++ b/utils/surface/algorithms.py
@@ -1377,6 +1377,11 @@ def remove_excessive_knots(surface, direction, tolerance=1e-6):
    return surface

 def build_nurbs_sphere(center, radius):
+    """
+    Generate NURBS Surphase representing a sphere.
+    Sphere is defined here as a surface of revolution of
+    half a circle.
+    """
    vectorx = np.array([0.0, 0.0, radius])
    axis = np.array([0.0, 0.0, 1.0])
    normal = np.array([1.0, 0.0, 0.0])