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76 lines
4.0 KiB
C++
76 lines
4.0 KiB
C++
// Copyright (c) 2013 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 _StdPrs_ToolTriangulatedShape_HeaderFile
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#define _StdPrs_ToolTriangulatedShape_HeaderFile
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#include <BRepLib_ToolTriangulatedShape.hxx>
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#include <TColgp_Array1OfDir.hxx>
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class TopoDS_Shape;
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class Prs3d_Drawer;
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class StdPrs_ToolTriangulatedShape: public BRepLib_ToolTriangulatedShape
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{
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public:
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//! Similar to BRepTools::Triangulation() but without extra checks.
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//! @return true if all faces within shape are triangulated.
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Standard_EXPORT static Standard_Boolean IsTriangulated (const TopoDS_Shape& theShape);
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//! Checks back faces visibility for specified shape (to activate back-face culling). <br>
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//! @return true if shape is closed manifold Solid or compound of such Solids. <br>
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Standard_EXPORT static Standard_Boolean IsClosed (const TopoDS_Shape& theShape);
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//! Computes the absolute deflection value depending on the type of deflection in theDrawer:
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//! <ul>
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//! <li><b>Aspect_TOD_RELATIVE</b>: the absolute deflection is computed using the relative
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//! deviation coefficient from theDrawer and the shape's bounding box;</li>
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//! <li><b>Aspect_TOD_ABSOLUTE</b>: the maximal chordial deviation from theDrawer is returned.</li>
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//! </ul>
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//! In case of the type of deflection in theDrawer computed relative deflection for shape is stored as absolute deflection.
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//! It is necessary to use it later on for sub-shapes.
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//! This function should always be used to compute the deflection value for building
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//! discrete representations of the shape (triangulation, wireframe) to avoid inconsistencies
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//! between different representations of the shape and undesirable visual artifacts.
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Standard_EXPORT static Standard_Real GetDeflection (const TopoDS_Shape& theShape,
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const Handle(Prs3d_Drawer)& theDrawer);
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//! Checks whether the shape is properly triangulated for a given display settings.
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//! @param theShape [in] the shape.
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//! @param theDrawer [in] the display settings.
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Standard_EXPORT static Standard_Boolean IsTessellated (const TopoDS_Shape& theShape,
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const Handle(Prs3d_Drawer)& theDrawer);
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//! Validates triangulation within the shape and performs tessellation if necessary.
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//! @param theShape [in] the shape.
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//! @param theDrawer [in] the display settings.
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//! @return true if tessellation was recomputed and false otherwise.
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Standard_EXPORT static Standard_Boolean Tessellate (const TopoDS_Shape& theShape,
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const Handle(Prs3d_Drawer)& theDrawer);
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//! If presentation has own deviation coefficient and IsAutoTriangulation() is true,
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//! function will compare actual coefficients with previous values and will clear triangulation on their change
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//! (regardless actual tessellation quality).
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//! Function is placed here for compatibility reasons - new code should avoid using IsAutoTriangulation().
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//! @param theShape [in] the shape
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//! @param theDrawer [in] the display settings
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//! @param theToResetCoeff [in] updates coefficients in theDrawer to actual state to avoid redundant recomputations
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Standard_EXPORT static void ClearOnOwnDeflectionChange (const TopoDS_Shape& theShape,
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const Handle(Prs3d_Drawer)& theDrawer,
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const Standard_Boolean theToResetCoeff);
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};
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#endif
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