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* Add nglib demonstrator for OpenCascade geometry "ng_occ.cpp" to the Netgen project tree

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Philippose Rajan 2010-05-20 20:47:29 +00:00
parent 768ef87cac
commit 067357176e
1 changed files with 142 additions and 0 deletions
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nglib/ng_occ.cpp Normal file
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#include <iostream>
#include <climits>
#include "TopTools_IndexedMapOfShape.hxx"
#include "TopoDS.hxx"
#include "TopoDS_Face.hxx"
#include "TopoDS_Shape.hxx"
#include "GProp_GProps.hxx"
#include "BRepGProp.hxx"
using namespace std;
namespace nglib {
#include <nglib.h>
}
int main (int argc, char ** argv)
{
using namespace nglib;
cout << "Netgen NgLib - OpenCascade Test Case" << endl;
if (argc != 2)
{
cerr << "use: ng_occ <src_step>" << endl;
return 1;
}
// Define pointer to OCC Geometry
Ng_OCC_Geometry *occ_geom;
Ng_Mesh *occ_mesh;
Ng_Meshing_Parameters mp;
TopTools_IndexedMapOfShape FMap;
Ng_OCC_TopTools_IndexedMapOfShape *occ_fmap = (Ng_OCC_TopTools_IndexedMapOfShape*)&FMap;
// Result of Netgen Operations
Ng_Result ng_res;
// Initialise the Netgen Core library
Ng_Init();
// Read in the OCC File
occ_geom = Ng_OCC_Load_STEP(argv[1]);
if(!occ_geom)
{
cout << "Error reading in STEP File: " << argv[1] << endl;
return 1;
}
cout << "Successfully loaded STEP File: " << argv[1] << endl;
occ_mesh = Ng_NewMesh();
ng_res = Ng_OCC_GetFMap(occ_geom,occ_fmap);
cout << "ng_res = " << ng_res << endl;
if(!FMap.Extent())
{
cout << "Error retrieving Face map...." << endl;
return 1;
}
cout << "Successfully extracted the Face Map....:" << FMap.Extent() << endl;
for(int i = 1; i <= FMap.Extent(); i++)
{
TopoDS_Face OCCface;
OCCface = TopoDS::Face(FMap.FindKey(i));
GProp_GProps faceProps;
BRepGProp::SurfaceProperties(OCCface,faceProps);
cout << "Index: " << i
<< " :: Area: " << faceProps.Mass()
<< " :: Hash: " << OCCface.HashCode(1e+6)
<< endl;
}
mp.uselocalh = 1;
mp.elementsperedge = 2.0;
mp.elementspercurve = 2.0;
mp.maxh = 10.0;
mp.grading = 0.2;
mp.closeedgeenable = 0;
mp.closeedgefact = 1.0;
mp.optsurfmeshenable = 1;
cout << "Setting Local Mesh size....." << endl;
cout << "OCC Mesh Pointer before call = " << occ_mesh << endl;
Ng_OCC_SetLocalMeshSize(occ_geom, occ_mesh, &mp);
cout << "Local Mesh size successfully set....." << endl;
cout << "OCC Mesh Pointer after call = " << occ_mesh << endl;
cout << "Creating Edge Mesh....." << endl;
ng_res = Ng_OCC_GenerateEdgeMesh(occ_geom, occ_mesh, &mp);
if(ng_res != NG_OK)
{
Ng_DeleteMesh(occ_mesh);
cout << "Error creating Edge Mesh.... Aborting!!" << endl;
return 1;
}
else
{
cout << "Edge Mesh successfully created....." << endl;
cout << "Number of points = " << Ng_GetNP(occ_mesh) << endl;
}
cout << "Creating Surface Mesh....." << endl;
ng_res = Ng_OCC_GenerateSurfaceMesh(occ_geom, occ_mesh, &mp);
if(ng_res != NG_OK)
{
Ng_DeleteMesh(occ_mesh);
cout << "Error creating Surface Mesh..... Aborting!!" << endl;
return 1;
}
else
{
cout << "Surface Mesh successfully created....." << endl;
cout << "Number of points = " << Ng_GetNP(occ_mesh) << endl;
cout << "Number of surface elements = " << Ng_GetNSE(occ_mesh) << endl;
}
cout << "Creating Volume Mesh....." << endl;
ng_res = Ng_GenerateVolumeMesh(occ_mesh, &mp);
cout << "Volume Mesh successfully created....." << endl;
cout << "Number of points = " << Ng_GetNP(occ_mesh) << endl;
cout << "Number of volume elements = " << Ng_GetNE(occ_mesh) << endl;
cout << "Saving Mesh as VOL file....." << endl;
Ng_SaveMesh(occ_mesh,"test_occ.vol");
return 0;
}