anim3D/src/RootGOPrivate.i3

 Copyright (C) 1994, Digital Equipment Corporation                         
 Digital Internal Use Only                                                 
 All rights reserved.                                                      
                                                                           
 Last modified on Fri Jul 29 13:41:18 PDT 1994 by najork                   
       Created on Wed Feb 16 18:24:35 PST 1994 by najork                   




INTERFACE RootGOPrivate;

IMPORT CameraGO, GraphicsBase;

FROM RootGO IMPORT T, Public;

REVEAL T <: Private;

TYPE
  Private = Public OBJECT
    cam  : CameraGO.T;
    base : GraphicsBase.T;
  END;

 root.repair(damaged) redraws the scene rooted at root. Only those
   nodes that were marked as damaged are re-rendered, for the other nodes,
   cached values are used.


   Nodes can be damaged in two ways:
   \begin{enumerate}
   \item By operations that change the scene DAG (i.e.\ the group operations
         add, remove, and flush).
   \item By changes in the value of an attached property.
   \end{enumerate}


   Calling root.adjust(time) serves two purposes: It reevaluates all the
   properties attached to all descendants of root, and damages those nodes
   whose properties have changed since the last round of rendering. It also
   propagates damages up the scene DAGs.
       
   root.repair(damaged) is called after all roots have been adjusted. The
   VAR parameter damaged is set to TRUE if there were any damages in the
   scene, otherwise, it remains unchanged. 


END RootGOPrivate.