meshing/lods/main.cxx

Refer to the Level of Details (LOD's) Example.

// ****************************************************************************
// $Id$
//
// Copyright (C) 2008-2014, Roman Lygin. All rights reserved.
// Copyright (C) 2014-2023, CADEX. All rights reserved.
//
// This file is part of the CAD Exchanger software.
//
// You may use this file under the terms of the BSD license as follows:
//
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//   this list of conditions and the following disclaimer.
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#include <cadex/LicenseManager_Activate.h>
#include <cadex/ModelAlgo_BRepMesher.hxx>
#include <cadex/ModelAlgo_BRepMesherParameters.hxx>
#include <cadex/ModelAlgo_TopoPrimitives.hxx>
#include <cadex/ModelData_BRepRepresentation.hxx>
#include <cadex/ModelData_ModelWriter.hxx>
#include <cadex/ModelData_Body.hxx>
#include <cadex/ModelData_IndexedTriangleSet.hxx>
#include <cadex/ModelData_Part.hxx>
#include <cadex/ModelData_PolyRepresentation.hxx>
#include <cadex/ModelData_PolyShapeList.hxx>
#include <cadex/ModelData_PolyVertexSet.hxx>
#include <cadex/ModelData_Solid.hxx>
#include <iostream>
 
#include "../../cadex_license.cxx"
 
 
using namespace std;
using namespace cadex;
 
static int NumberOfTriangles (const ModelData_PolyRepresentation& thePoly)
{
    int trianglesNb = 0;
 
    const ModelData_PolyShapeList& aList = thePoly.Get();
    for (size_t i = 0; i < aList.Size (); ++i) {
        const ModelData_PolyVertexSet& aPVS = aList[i];
        if (aPVS.IsOfType<ModelData_IndexedTriangleSet>()) {
            const ModelData_IndexedTriangleSet& anITS = static_cast<const ModelData_IndexedTriangleSet&> (aPVS);
            trianglesNb += anITS.NumberOfFaces();
        }
    }
 
    return trianglesNb;
}
 
static ModelData_BRepRepresentation CreateSphereBRep (ModelData_Point thePosition, double theRadius)
{
    ModelData_Solid aSphere = ModelAlgo_TopoPrimitives::CreateSphere (thePosition, theRadius);
    ModelData_Body aBody = ModelData_Body::Create (aSphere);
    ModelData_BRepRepresentation aBRep (aBody);
    return aBRep;
}
 
void AddPolyToPart (ModelData_Part& thePart,
                    ModelAlgo_BRepMesherParameters::Granularity theLOD)
{
    const ModelData_BRepRepresentation& aBRep = thePart.BRepRepresentation();
 
    ModelAlgo_BRepMesherParameters aParam (theLOD);
    ModelAlgo_BRepMesher aMesher (aParam);
 
    ModelData_PolyRepresentation aPoly = aMesher.Compute (aBRep);
 
    thePart.AddRepresentation (aPoly);
 
    cout << "A polygonal representation with " << NumberOfTriangles (aPoly) << " triangles has been added." << endl;
}
 
int main()
{
    auto aKey = LicenseKey::Value();
 
    // Activate the license (aKey must be defined in cadex_license.cxx)
    if (!CADExLicense_Activate (aKey)) {
        cerr << "Failed to activate CAD Exchanger license." << endl;
        return 1;
    }
 
    ModelData_BRepRepresentation aBRep = CreateSphereBRep (ModelData_Point (0., 0., 0.), 10.);
    ModelData_Part aPart (aBRep, "Sphere");
 
    AddPolyToPart (aPart, ModelAlgo_BRepMesherParameters::Coarse);
    AddPolyToPart (aPart, ModelAlgo_BRepMesherParameters::Medium);
    AddPolyToPart (aPart, ModelAlgo_BRepMesherParameters::Fine);
 
    ModelData_Model aModel;
    aModel.AddRoot (aPart);
 
    // Save the result
    if (!ModelData_ModelWriter().Write (aModel, "SphereWithLODs.xml")) {
        cout << "Unable to save the model!" << endl;
        return 1;
    }
 
    return 0;
}