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gluNurbsCallbackDataEXT - set a user data pointer 
 
void
gluNurbsCallbackDataEXT( GLUnurbs* nurb, 
    GLvoid* userData )
 eqn not supported
- nurb 
- Specifies the NURBS object (created with
gluNewNurbsRenderer). 
- userData 
- Specifies a pointer to the user's data. 
gluNurbsCallbackDataEXT
is used to pass a pointer to the application's data to NURBS tessellator.
A copy of this pointer will be passed by the tessellator in the NURBS callback
functions (set by gluNurbsCallback). 
gluNurbsCallback(3G)
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