A CustomShape is a subclass of (Shape) which allows the user to construct an arbitrary convex shape by specifying the faces of the shape.

The shapes must conform to the following rules:

• The point (0, 0, 0) must be on inside (not outside or on the surface of) the shape.

• The shape must be convex.

• The shape must be solid and sealed by the faces.

If any of these conditions are not met, you will get errors and/or unexpected results.