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The algorithm that builds outlines ("silhouettes") makes an outline in 2d parametric space of the surface starting from some previously detected point where normal is orthogonal to direction of view. So, the surface is previously discretized into (m*n) sample points and some of them become starting points for future outlines.
If the surface has non-uniform parametrization and/or some local extremums of curvature, the outlines can not be built without breaks, so there are several groups of consequent outlines in this case. Unfortunately, it leads to the situation when current number of sample points becomes insufficient to build all the parts of outlines.
The idea is to detect the "holes" between already constructed parts of outlines and then complete the construction.
New auxiliary draw command for testing of HLR.
Correction according to the remarks.
Update of test case according to the developer's directive
118 lines
3.7 KiB
C++
118 lines
3.7 KiB
C++
// Created on: 1992-05-06
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// Created by: Jacques GOUSSARD
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// Copyright (c) 1992-1999 Matra Datavision
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// Copyright (c) 1999-2014 OPEN CASCADE SAS
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//
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// This file is part of Open CASCADE Technology software library.
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//
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// This library is free software; you can redistribute it and/or modify it under
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// the terms of the GNU Lesser General Public License version 2.1 as published
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// by the Free Software Foundation, with special exception defined in the file
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// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
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// distribution for complete text of the license and disclaimer of any warranty.
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//
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// Alternatively, this file may be used under the terms of Open CASCADE
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// commercial license or contractual agreement.
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#ifndef _IntSurf_PntOn2S_HeaderFile
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#define _IntSurf_PntOn2S_HeaderFile
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#include <Standard.hxx>
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#include <Standard_DefineAlloc.hxx>
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#include <Standard_Handle.hxx>
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#include <gp_Pnt.hxx>
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#include <Standard_Real.hxx>
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#include <Standard_Boolean.hxx>
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class gp_Pnt;
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class gp_Pnt2d;
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//! This class defines the geometric informations
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//! for an intersection point between 2 surfaces :
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//! The coordinates ( Pnt from gp ), and two
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//! parametric coordinates.
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class IntSurf_PntOn2S
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{
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public:
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DEFINE_STANDARD_ALLOC
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//! Empty constructor.
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Standard_EXPORT IntSurf_PntOn2S();
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//! Sets the value of the point in 3d space.
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void SetValue (const gp_Pnt& Pt);
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//! Sets the values of the point in 3d space, and
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//! in the parametric space of one of the surface.
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Standard_EXPORT void SetValue (const gp_Pnt& Pt, const Standard_Boolean OnFirst, const Standard_Real U, const Standard_Real V);
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//! Sets the values of the point in 3d space, and
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//! in the parametric space of each surface.
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void SetValue (const gp_Pnt& Pt, const Standard_Real U1, const Standard_Real V1, const Standard_Real U2, const Standard_Real V2);
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//! Set the values of the point in the parametric
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//! space of one of the surface.
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Standard_EXPORT void SetValue (const Standard_Boolean OnFirst, const Standard_Real U, const Standard_Real V);
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//! Set the values of the point in the parametric
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//! space of one of the surface.
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void SetValue (const Standard_Real U1, const Standard_Real V1, const Standard_Real U2, const Standard_Real V2) ;
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//! Returns the point in 3d space.
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const gp_Pnt& Value() const;
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//! Returns the point in 2d space of one of the surfaces.
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Standard_EXPORT gp_Pnt2d ValueOnSurface (const Standard_Boolean OnFirst) const;
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//! Returns the parameters of the point on the first surface.
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void ParametersOnS1 (Standard_Real& U1, Standard_Real& V1) const;
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//! Returns the parameters of the point on the second surface.
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void ParametersOnS2 (Standard_Real& U2, Standard_Real& V2) const;
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//! Returns the parameters of the point in the
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//! parametric space of one of the surface.
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Standard_EXPORT void ParametersOnSurface (const Standard_Boolean OnFirst, Standard_Real& U, Standard_Real& V) const;
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//! Returns the parameters of the point on both surfaces.
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void Parameters (Standard_Real& U1, Standard_Real& V1, Standard_Real& U2, Standard_Real& V2) const;
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//! Returns TRUE if 2D- and 3D-coordinates of theOterPoint are equal to
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//! corresponding coordinates of me (with given tolerance).
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//! If theTol2D < 0.0 we will compare 3D-points only.
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Standard_EXPORT Standard_Boolean IsSame (const IntSurf_PntOn2S& theOtherPoint, const Standard_Real theTol3D = 0.0, const Standard_Real theTol2D = -1.0) const;
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protected:
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private:
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gp_Pnt pt;
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Standard_Real u1;
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Standard_Real v1;
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Standard_Real u2;
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Standard_Real v2;
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};
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#include <IntSurf_PntOn2S.lxx>
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#endif // _IntSurf_PntOn2S_HeaderFile
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