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Utility function to generate OCC shape triangulation -> always use same parameters

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This commit is contained in:
Matthias Hochsteger 2024-02-29 17:19:47 +01:00
parent ebcca37714
commit b8aa568626
5 changed files with 32 additions and 67 deletions
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22
libsrc/occ/occ_utils.cpp
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@ -1,6 +1,8 @@
#include <Bnd_Box.hxx>
#include <BRepBndLib.hxx>
#include <BRep_TVertex.hxx>
#include <BRepMesh_IncrementalMesh.hxx>
#include <BRepTools.hxx>
#include "occ_utils.hpp"
@ -55,4 +57,24 @@ namespace netgen
#endif
return {occ2ng(bb.CornerMin()), occ2ng(bb.CornerMax())};
}
Standard_Integer BuildTriangulation( const TopoDS_Shape & shape )
{
BRepTools::Clean (shape);
double deflection = 0.01;
// https://dev.opencascade.org/doc/overview/html/occt_user_guides__mesh.html
// from Standard_Boolean meshing_imeshtools_parameters()
IMeshTools_Parameters aMeshParams;
aMeshParams.Deflection = 0.01;
aMeshParams.Angle = 0.5;
aMeshParams.Relative = Standard_False;
aMeshParams.InParallel = Standard_True;
aMeshParams.MinSize = Precision::Confusion();
aMeshParams.InternalVerticesMode = Standard_True;
aMeshParams.ControlSurfaceDeflection = Standard_True;
BRepMesh_IncrementalMesh aMesher (shape, aMeshParams);
return aMesher.GetStatusFlags();
}
}

2
libsrc/occ/occ_utils.hpp
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@ -76,6 +76,8 @@ namespace netgen
bool opposite_direction;
};
Standard_Integer BuildTriangulation( const TopoDS_Shape & shape );
class MyExplorer
{

25
libsrc/occ/occgenmesh.cpp
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@ -11,7 +11,6 @@
#include <BRepGProp.hxx>
#include <BRepLProp_CLProps.hxx>
#include <BRepLProp_SLProps.hxx>
#include <BRepMesh_IncrementalMesh.hxx>
#include <BRepTools.hxx>
#include <GProp_GProps.hxx>
#include <Quantity_Color.hxx>
@ -654,6 +653,7 @@ namespace netgen
int nfaces = geom.fmap.Extent();
BuildTriangulation(geom.shape);
for (int i = 1; i <= nfaces && !multithread.terminate; i++)
{
multithread.percent = 100 * (i-1)/double(nfaces);
@ -663,29 +663,6 @@ namespace netgen
Handle(Geom_Surface) surf = BRep_Tool::Surface (face);
Handle(Poly_Triangulation) triangulation = BRep_Tool::Triangulation (face, loc);
if (triangulation.IsNull())
{
BRepTools::Clean (geom.shape);
// BRepMesh_IncrementalMesh (geom.shape, 0.01, true);
// https://dev.opencascade.org/doc/overview/html/occt_user_guides__mesh.html
IMeshTools_Parameters aMeshParams;
aMeshParams.Deflection = 0.01;
aMeshParams.Angle = 0.5;
aMeshParams.Relative = Standard_False;
aMeshParams.InParallel = Standard_True;
aMeshParams.MinSize = Precision::Confusion();
aMeshParams.InternalVerticesMode = Standard_True;
aMeshParams.ControlSurfaceDeflection = Standard_True;
BRepMesh_IncrementalMesh aMesher (geom.shape, aMeshParams);
const Standard_Integer aStatus = aMesher.GetStatusFlags();
if (aStatus != 0)
cout << "BRepMesh_IncrementalMesh.status = " << aStatus << endl;
triangulation = BRep_Tool::Triangulation (face, loc);
}
if(triangulation.IsNull())
{
if (geom.shape.Infinite())

10
libsrc/occ/occgeom.cpp
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@ -23,7 +23,6 @@
#include <BRepExtrema_DistShapeShape.hxx>
#include <BRepGProp.hxx>
#include <BRepLib.hxx>
#include <BRepMesh_IncrementalMesh.hxx>
#include <BRepOffsetAPI_Sewing.hxx>
#include <BRepTools.hxx>
#include <IGESCAFControl_Reader.hxx>
@ -1387,12 +1386,9 @@ namespace netgen
void OCCGeometry :: BuildVisualizationMesh (double deflection)
{
cout << "Preparing visualization (deflection = " << deflection << ") ... " << flush;
BRepTools::Clean (shape);
// BRepMesh_IncrementalMesh::
BRepMesh_IncrementalMesh (shape, deflection, true);
cout << "done" << endl;
// cout << IM(5) << "Preparing visualization (deflection = " << deflection << ") ... " << flush;
BuildTriangulation(shape);
// cout << IM(5) << "done" << endl;
}

40
libsrc/occ/python_occ_shapes.cpp
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@ -9,6 +9,7 @@
#include <meshing.hpp>
#include "occgeom.hpp"
#include "occ_utils.hpp"
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wdeprecated-declarations"
@ -32,7 +33,6 @@
#include <BRepGProp.hxx>
#include <BRepLProp_SLProps.hxx>
#include <BRepLib.hxx>
#include <BRepMesh_IncrementalMesh.hxx>
#include <BRepOffsetAPI_MakeOffset.hxx>
#include <BRepOffsetAPI_MakePipe.hxx>
#include <BRepOffsetAPI_MakePipeShell.hxx>
@ -45,7 +45,6 @@
#include <BRepPrimAPI_MakePrism.hxx>
#include <BRepPrimAPI_MakeRevol.hxx>
#include <BRepPrimAPI_MakeSphere.hxx>
#include <BRepTools.hxx>
#include <GCE2d_MakeArcOfCircle.hxx>
#include <GCE2d_MakeCircle.hxx>
#include <GCE2d_MakeSegment.hxx>
@ -1150,9 +1149,7 @@ DLL_HEADER void ExportNgOCCShapes(py::module &m)
.def("MakeTriangulation", [](const TopoDS_Shape & shape)
{
BRepTools::Clean (shape);
double deflection = 0.01;
BRepMesh_IncrementalMesh (shape, deflection, true);
BuildTriangulation(shape);
})
@ -1181,12 +1178,6 @@ DLL_HEADER void ExportNgOCCShapes(py::module &m)
throw NgException ("Triangulation: shape is not a face");
}
/*
BRepTools::Clean (shape);
double deflection = 0.01;
BRepMesh_IncrementalMesh (shape, deflection, true);
*/
Handle(Geom_Surface) surf = BRep_Tool::Surface (face);
TopLoc_Location loc;
@ -1194,9 +1185,7 @@ DLL_HEADER void ExportNgOCCShapes(py::module &m)
if (triangulation.IsNull())
{
BRepTools::Clean (shape);
double deflection = 0.01;
BRepMesh_IncrementalMesh (shape, deflection, true);
BuildTriangulation(shape);
triangulation = BRep_Tool::Triangulation (face, loc);
}
// throw Exception("Don't have a triangulation, call 'MakeTriangulation' first");
@ -1217,30 +1206,9 @@ DLL_HEADER void ExportNgOCCShapes(py::module &m)
})
.def("_webgui_data", [](const TopoDS_Shape & shape)
{
BRepTools::Clean (shape);
double deflection = 0.01;
// BRepMesh_IncrementalMesh mesher(shape, deflection,Standard_True, 0.01, true);
// mesher.Perform();
// https://dev.opencascade.org/doc/overview/html/occt_user_guides__mesh.html
// from Standard_Boolean meshing_imeshtools_parameters()
IMeshTools_Parameters aMeshParams;
aMeshParams.Deflection = 0.01;
aMeshParams.Angle = 0.5;
aMeshParams.Relative = Standard_False;
aMeshParams.InParallel = Standard_True;
aMeshParams.MinSize = Precision::Confusion();
aMeshParams.InternalVerticesMode = Standard_True;
aMeshParams.ControlSurfaceDeflection = Standard_True;
BRepMesh_IncrementalMesh aMesher (shape, aMeshParams);
const Standard_Integer aStatus = aMesher.GetStatusFlags();
auto status = BuildTriangulation(shape);
// cout << "status = " << aStatus << endl;
// triangulation = BRep_Tool::Triangulation (face, loc);
std::vector<double> p[3];
std::vector<double> n[3];
py::list names, colors, solid_names;