-- File:	Prs3d_Root.cdl
-- Created:	Tue Dec 15 18:07:36 1992
-- Author:	Jean Louis FRENKEL
--		<jlf@mastox>
---Copyright:	 Matra Datavision 1992


deferred class Root from Prs3d

    	---Purpose: A root class for the standard presentation algorithms
    	-- of the StdPrs package.
    	--          
uses
    Presentation from Prs3d,
    Structure from Graphic3d,
    Group from Graphic3d

is
    CurrentGroup(myclass; Prs3d: Presentation from Prs3d) returns Group from Graphic3d;
    	---Purpose: Returns the current group of primititves inside graphic
    	-- objects in the display.
    	-- A group also contains the attributes whose ranges are
    	-- limited to the primitives in it. 
    
    NewGroup (myclass; Prs3d: Presentation from Prs3d ) returns Group from Graphic3d ;
    	---Purpose: Returns the new group of primitives inside graphic
    	-- objects in the display.
    	-- A group also contains the attributes whose ranges are limited to the primitives in it.
    
end Root from Prs3d;