1 -- Created on: 1991-10-28
2 -- Created by: Remi LEQUETTE
3 -- Copyright (c) 1991-1999 Matra Datavision
4 -- Copyright (c) 1999-2012 OPEN CASCADE SAS
6 -- The content of this file is subject to the Open CASCADE Technology Public
7 -- License Version 6.5 (the "License"). You may not use the content of this file
8 -- except in compliance with the License. Please obtain a copy of the License
9 -- at http://www.opencascade.org and read it completely before using this file.
11 -- The Initial Developer of the Original Code is Open CASCADE S.A.S., having its
12 -- main offices at: 1, place des Freres Montgolfier, 78280 Guyancourt, France.
14 -- The Original Code and all software distributed under the License is
15 -- distributed on an "AS IS" basis, without warranty of any kind, and the
16 -- Initial Developer hereby disclaims all such warranties, including without
17 -- limitation, any warranties of merchantability, fitness for a particular
18 -- purpose or non-infringement. Please see the License for the specific terms
19 -- and conditions governing the rights and limitations under the License.
25 ---Purpose: This package provides algorithms to compute
26 -- complex transitions. A transition is the status of
27 -- geometry near the boundary of a Shape. An example
28 -- is the intersection of a curve and a surface
29 -- enclosing a solid , the transition tells if the
30 -- parts of the curve just before and just after the
31 -- intersection are inside, outside or on the
32 -- boundary of the solid.
34 -- The difficulty with transitions arise when dealing
35 -- with trimmed geometries like edges and faces. When
36 -- the geometric intersections are inside the trimmed
37 -- geometry the transition is usually computed by the
38 -- intersection algorithms as the trimming can be
39 -- safely ignored. If the intersection falls on the
40 -- trimming boundaries one must consider the
41 -- neighbouring entities. Consider as an example the
42 -- intersection of a curve and a solid, if the
43 -- intersection falls on an edge of the solid it does
44 -- not falls inside the two faces adjacent to the
45 -- edge, a complex transition occurs.
47 -- This package provides two classes :
49 -- * CurveTransition is used to compute complex
50 -- transitions with an other curve.
52 -- * SurfaceTransition is used to compute complex
53 -- transitions in 3D space.
55 -- The curves and surfaces are given by a first or
56 -- second order approximation around the intersection
57 -- point. For a curve, the tangent vector or the
58 -- osculating circle. For a surface the normal vector
59 -- or the osculating quadric.
70 class Array2OfOrientation instantiates
71 Array2 from TCollection (Orientation from TopAbs);
73 class CurveTransition;
75 class SurfaceTransition;