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1 | -- Created on: 1993-03-10 |
2 | -- Created by: Philippe DAUTRY |
3 | -- Copyright (c) 1993-1999 Matra Datavision |
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4 | -- Copyright (c) 1999-2014 OPEN CASCADE SAS |
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5 | -- |
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6 | -- This file is part of Open CASCADE Technology software library. |
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7 | -- |
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8 | -- This library is free software; you can redistribute it and/or modify it under |
9 | -- the terms of the GNU Lesser General Public License version 2.1 as published |
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10 | -- by the Free Software Foundation, with special exception defined in the file |
11 | -- OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT |
12 | -- distribution for complete text of the license and disclaimer of any warranty. |
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13 | -- |
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14 | -- Alternatively, this file may be used under the terms of Open CASCADE |
15 | -- commercial license or contractual agreement. |
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16 | |
17 | deferred class BoundedSurface from Geom inherits Surface from Geom |
18 | |
19 | |
20 | ---Purpose : The root class for bounded surfaces in 3D space. A |
21 | -- bounded surface is defined by a rectangle in its 2D parametric space, i.e. |
22 | -- - its u parameter, which ranges between two finite |
23 | -- values u0 and u1, referred to as "First u |
24 | -- parameter" and "Last u parameter" respectively, and |
25 | -- - its v parameter, which ranges between two finite |
26 | -- values v0 and v1, referred to as "First v |
27 | -- parameter" and the "Last v parameter" respectively. |
28 | -- The surface is limited by four curves which are the |
29 | -- boundaries of the surface: |
30 | -- - its u0 and u1 isoparametric curves in the u parametric direction, and |
31 | -- - its v0 and v1 isoparametric curves in the v parametric direction. |
32 | -- A bounded surface is finite. |
33 | -- The common behavior of all bounded surfaces is |
34 | -- described by the Geom_Surface class. |
35 | -- The Geom package provides three concrete |
36 | -- implementations of bounded surfaces: |
37 | -- - Geom_BezierSurface, |
38 | -- - Geom_BSplineSurface, and |
39 | -- - Geom_RectangularTrimmedSurface. |
40 | -- The first two of these implement well known |
41 | -- mathematical definitions of complex surfaces, the third |
42 | -- trims a surface using four isoparametric curves, i.e. it |
43 | -- limits the variation of its parameters to a rectangle in |
44 | -- 2D parametric space. |
45 | |
46 | is |
47 | |
48 | |
49 | end; |
50 | |
51 | |
52 | |