CenterStage Object Class:  DataFromPolyhedron
Subclass of:  Polyhedron
Requires a reference to a Polyhedron object

The DataFromPolyhedron class provides a means of using the data already
computed by another Polyhedron object.  One reason to do this is to change
the coloring or display attributes without having to recompute the data. 
Another is to make a ShowMe checkbox that can be used to turn the
polyhedron on and off without recomputing it (or any other objects linked
to it).  To do this, make a Polyhedron object that has its OBJECT/SHOW menu
set to NEVER, and then create a DataFromPolyhedron object that links to it
and has the CheckBox and ShowMe directives.  When the DataFromPolyhedron
object is first shown, it will force the Polyhedron object to compute the
data, and then the DataFromPolyhedron object will be able to use that data
whenever it is shown, without recomputing it.

The DataFromPolyhedron object has no non-standard directives.