Description: establishes a view point for the rendering library
notes:
derived nodes inherit all messages from their base classes
added automatically to scene at startup unless the --noview option is used
Category: Foundation
Author: Dave Pape
11/01/01
05/01/03 Alex Hill - added setUser() method to use another user perspective
Revision: 02/01/06 Alex Hill - broke ygCAVEViewer into ygViewer base class and subclass