1 // Created on: 1995-10-12
2 // Created by: Bruno DUMORTIER
3 // Copyright (c) 1995-1999 Matra Datavision
4 // Copyright (c) 1999-2014 OPEN CASCADE SAS
6 // This file is part of Open CASCADE Technology software library.
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
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.
14 // Alternatively, this file may be used under the terms of Open CASCADE
15 // commercial license or contractual agreement.
17 #ifndef _BRepOffset_HeaderFile
18 #define _BRepOffset_HeaderFile
20 #include <Standard.hxx>
21 #include <Standard_DefineAlloc.hxx>
22 #include <Standard_Handle.hxx>
24 #include <BRepOffset_Status.hxx>
29 //! Auxiliary tools for offset algorithms
35 //! returns the Offset surface computed from the
36 //! surface <Surface> at an OffsetDistance <Offset>.
38 //! If possible, this method returns the real type of
39 //! the surface ( e.g. An Offset of a plane is a plane).
41 //! If no particular case is detected, the returned
42 //! surface will have the Type Geom_OffsetSurface.
43 //! Parameter allowC0 is then passed as last argument to
44 //! constructor of Geom_OffsetSurface.
45 Standard_EXPORT static Handle(Geom_Surface) Surface (const Handle(Geom_Surface)& Surface,
46 const Standard_Real Offset,
47 BRepOffset_Status& theStatus,
48 Standard_Boolean allowC0 = Standard_False);
50 //! Preprocess surface to be offset (bspline, bezier, or revolution based on
51 //! bspline or bezier curve), by collapsing each singular side to single point.
53 //! This is to avoid possible flipping of normal at the singularity
54 //! of the surface due to non-zero distance between the poles that
55 //! logically should be in one point (singularity).
57 //! The (parametric) side of the surface is considered to be singularity if face
58 //! has degenerated edge whose vertex encompasses (by its tolerance) all points on that side,
59 //! or if all poles defining that side fit into sphere with radius thePrecision.
61 //! Returns either original surface or its modified copy (if some poles have been moved).
62 Standard_EXPORT static Handle(Geom_Surface) CollapseSingularities (const Handle(Geom_Surface)& theSurface,
63 const TopoDS_Face& theFace,
64 Standard_Real thePrecision);
68 #endif // _BRepOffset_HeaderFile