Integration of OCCT 6.5.0 from SVN
[occt.git] / src / TopTrans / TopTrans.cdl
CommitLineData
7fd59977 1-- File: TopTrans.cdl
2-- Created: Mon Oct 28 14:59:09 1991
3-- Author: Remi LEQUETTE
4-- <rle@phobox>
5---Copyright: Matra Datavision 1991, 1992
6
7
8package TopTrans
9
10 ---Purpose: This package provides algorithms to compute
11 -- complex transitions. A transition is the status of
12 -- geometry near the boundary of a Shape. An example
13 -- is the intersection of a curve and a surface
14 -- enclosing a solid , the transition tells if the
15 -- parts of the curve just before and just after the
16 -- intersection are inside, outside or on the
17 -- boundary of the solid.
18 --
19 -- The difficulty with transitions arise when dealing
20 -- with trimmed geometries like edges and faces. When
21 -- the geometric intersections are inside the trimmed
22 -- geometry the transition is usually computed by the
23 -- intersection algorithms as the trimming can be
24 -- safely ignored. If the intersection falls on the
25 -- trimming boundaries one must consider the
26 -- neighbouring entities. Consider as an example the
27 -- intersection of a curve and a solid, if the
28 -- intersection falls on an edge of the solid it does
29 -- not falls inside the two faces adjacent to the
30 -- edge, a complex transition occurs.
31 --
32 -- This package provides two classes :
33 --
34 -- * CurveTransition is used to compute complex
35 -- transitions with an other curve.
36 --
37 -- * SurfaceTransition is used to compute complex
38 -- transitions in 3D space.
39 --
40 -- The curves and surfaces are given by a first or
41 -- second order approximation around the intersection
42 -- point. For a curve, the tangent vector or the
43 -- osculating circle. For a surface the normal vector
44 -- or the osculating quadric.
45
46uses
47 Standard,
48 TCollection,
49 TColStd,
50 gp,
51 TopAbs
52
53is
54
55 class Array2OfOrientation instantiates
56 Array2 from TCollection (Orientation from TopAbs);
57
58 class CurveTransition;
59
60 class SurfaceTransition;
61
62end TopTrans;