Stubbed out subd.butterfly and added testing script

surf/__init__.py

@@ -1,6 +1,8 @@
 from .geometry import Vertex, PolygonMesh
+from . import subd
 
 __all__ = [
     Vertex.__name__,
     PolygonMesh.__name__,
+    'subd',
 ]

surf/geometry.py

@@ -18,6 +18,11 @@ We have chosen to use a winged-edge style mesh for our purpopses.
 
 '''
 
+__all__ = [
+    'Vertex',
+    'PolygonMesh',
+]
+
 
 def cross(a, b):
     i = a.y * b.z - a.z * b.y

surf/subd/__init__.py

@@ -0,0 +1,7 @@
+from . import cc, butterfly
+
+
+__all__ = [
+    cc.__name__,
+    butterfly.__name__,
+]

surf/subd/butterfly.py

@@ -0,0 +1,2 @@
+def refine(mesh):
+    pass

surf/subd/cc.py

@@ -109,14 +109,3 @@ def refine(mesh):
             new_faces.append([fvid, common_ids[0], connected_vid, common_ids[1]])
 
     return PolygonMesh(vertices=new_vertices, edges=new_edges, faces=new_faces)
-
-
-if __name__ == '__main__':
-    import sys
-    import json
-    from surf.subd.cc import refine
-    input_file_name = sys.argv[1]
-    cube = json.load(open(input_file_name, 'r'))
-    p = PolygonMesh(**cube)
-    q = refine(p)
-    print q