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									 procedure rglSetSceneMouseCallbacks( aOnMouseMove : TProcSceneOnMouseMoveEvent; aOnMouseDown : TProcSceneOnMouseDownEvent; aOnMouseUp : TProcSceneOnMouseUpEvent); stdcall;
  Set the Mousemove, mouse down, and mouse up even callbacks for the scene 
  Parameters aOnMouseMove  - set this to trap mouse move events   aOnMouseDown  - set this to trap mouse button down events aOnMouseUp  - set this to trap mouse button up events
  Remark use nil (null in c++) if you dont want to use one of the callbacks 
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