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https://git.dev.opencascade.org/repos/occt.git
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e2d60d0f7f
Added PLY writing tools RWPly_CafWriter and RWPly_PlyWriterContext. Added tool BRepLib_PointCloudShape generating point cloud from shape in two ways: - random points on surface with specified density; - points from triangulation nodes. StdPrs_ToolTriangulatedShape::ComputeNormals() has been moved to BRepLib_ToolTriangulatedShape for reusing outside of AIS. Command vpointcloud has been extended to use new generation tool. Command writeply has been added to write triangulation or point set into PLY format.
84 lines
3.0 KiB
C++
84 lines
3.0 KiB
C++
// Copyright (c) 2021 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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#include <BRepLib_ToolTriangulatedShape.hxx>
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#include <BRep_Tool.hxx>
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#include <GeomLib.hxx>
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#include <Poly.hxx>
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#include <Poly_Connect.hxx>
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#include <Precision.hxx>
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#include <TopLoc_Location.hxx>
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#include <TopoDS.hxx>
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#include <TopoDS_Face.hxx>
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// =======================================================================
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// function : ComputeNormals
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// purpose :
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// =======================================================================
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void BRepLib_ToolTriangulatedShape::ComputeNormals (const TopoDS_Face& theFace,
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const Handle(Poly_Triangulation)& theTris,
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Poly_Connect& thePolyConnect)
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{
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if (theTris.IsNull()
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|| theTris->HasNormals())
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{
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return;
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}
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// take in face the surface location
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const TopoDS_Face aZeroFace = TopoDS::Face (theFace.Located (TopLoc_Location()));
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Handle(Geom_Surface) aSurf = BRep_Tool::Surface (aZeroFace);
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if (!theTris->HasUVNodes() || aSurf.IsNull())
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{
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// compute normals by averaging triangulation normals sharing the same vertex
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Poly::ComputeNormals (theTris);
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return;
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}
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const Standard_Real aTol = Precision::Confusion();
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Standard_Integer aTri[3];
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gp_Dir aNorm;
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theTris->AddNormals();
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for (Standard_Integer aNodeIter = 1; aNodeIter <= theTris->NbNodes(); ++aNodeIter)
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{
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// try to retrieve normal from real surface first, when UV coordinates are available
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if (GeomLib::NormEstim (aSurf, theTris->UVNode (aNodeIter), aTol, aNorm) > 1)
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{
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if (thePolyConnect.Triangulation() != theTris)
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{
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thePolyConnect.Load (theTris);
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}
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// compute flat normals
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gp_XYZ eqPlan (0.0, 0.0, 0.0);
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for (thePolyConnect.Initialize (aNodeIter); thePolyConnect.More(); thePolyConnect.Next())
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{
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theTris->Triangle (thePolyConnect.Value()).Get (aTri[0], aTri[1], aTri[2]);
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const gp_XYZ v1 (theTris->Node (aTri[1]).Coord() - theTris->Node (aTri[0]).Coord());
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const gp_XYZ v2 (theTris->Node (aTri[2]).Coord() - theTris->Node (aTri[1]).Coord());
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const gp_XYZ vv = v1 ^ v2;
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const Standard_Real aMod = vv.Modulus();
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if (aMod >= aTol)
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{
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eqPlan += vv / aMod;
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}
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}
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const Standard_Real aModMax = eqPlan.Modulus();
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aNorm = (aModMax > aTol) ? gp_Dir (eqPlan) : gp::DZ();
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}
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theTris->SetNormal (aNodeIter, aNorm);
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}
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}
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