-- File:	TopTrans.cdl
-- Created:	Mon Oct 28 14:59:09 1991
-- Author:	Remi LEQUETTE
--		<rle@phobox>
---Copyright:	 Matra Datavision 1991, 1992


package TopTrans 

	---Purpose: This   package provides  algorithms  to    compute
	--          complex transitions. A transition is the status of
	--          geometry near the boundary of a Shape.  An example
	--          is  the  intersection of  a  curve  and  a surface
	--          enclosing a solid   , the transition  tells if the
	--          parts of the curve just  before and just after the
	--          intersection  are   inside, outside   or   on  the
	--          boundary of the solid.
	--          
	--          The difficulty with transitions arise when dealing
	--          with trimmed geometries like edges and faces. When
	--          the geometric intersections are inside the trimmed
	--          geometry the transition is usually computed by the
	--          intersection algorithms   as the  trimming can  be
	--          safely ignored. If the  intersection  falls on the
	--          trimming  boundaries   one  must   consider    the
	--          neighbouring entities. Consider as  an example the
	--          intersection  of a  curve   and a   solid,  if the
	--          intersection falls on an edge of the solid it does
	--          not falls inside  the  two faces  adjacent to  the
	--          edge, a complex transition occurs.
	--          
	--          This package provides two classes :
	--          
	--              * CurveTransition is  used to compute  complex
	--              transitions with an other curve.
	--              
	--              * SurfaceTransition is used to compute complex
	--              transitions in 3D space.
	--              
        --         The curves and surfaces are  given   by a first  or
        --         second order  approximation around the intersection
        --         point.   For a  curve, the  tangent  vector or  the
        --         osculating circle. For  a surface the normal vector
        --         or the osculating quadric.

uses
    Standard,
    TCollection,
    TColStd,
    gp,
    TopAbs

is
    
    class Array2OfOrientation instantiates 
    	Array2 from TCollection (Orientation from TopAbs);
    
    class CurveTransition;
    
    class SurfaceTransition;

end TopTrans;