Create a SubD surface from a box.

Input parameters:

1. Bx → Box for SubD control net.
2. Fx → Number of faces in the box X direction.
3. Fy → Number of faces in the box Y direction.
4. Fz → Number of faces in the box Z direction.
5. Cr → When true, the box edges become sharp creases in the subdivision surface.

Output parameters:

1. Sd → Subdivision surface based on the input box.