-- File:	PPoly.cdl
-- Created:	Tue Oct 24 10:30:44 1995
-- Author:	Mister rmi
--		<rmi@pronox>
---Copyright:	 Matra Datavision 1995


package PPoly 

	---Purpose: This  package  provides  persistent classes  to
	--          handle :
	--          
	--          * 3D triangular polyhedrons.
	--          
	--          * 3D polygons.
	--          
	--          * 2D polygon.

uses    PCollection,
        PColStd,
   	PColgp

is

    class Triangle;
	---Purpose: A triangle is  a triplet  of integers (indices  of
	--          the nodes).
    
    class Triangulation;
	---Purpose: A   Triangulation  is  a   3D  polyhedron made  of
	--          triangles.  It   is  made  of  a nodes  which  are
	--          indexed. Nodes  have a 3d  value  and a  2d value.
	--          Triangles are triplet of node indices.
	--          
	--          This is a Transient class.


    class Polygon3D;
    	---Purpose: A Polygon3D is  made of  indexed nodes.
    	--          Nodes have a 3d value.

    class Polygon2D;
    	---Purpose: A Polygon2D is made of  indexed nodes.
    	--          Nodes have a 2d value.
	  
    class PolygonOnTriangulation;
    	---Purpose: A polygonOnTriangulation is made of node indices
    	--          referencing a triangulation.

    class HArray1OfTriangle
    instantiates HArray1 from PCollection(Triangle from PPoly);

end PPoly;