Refer to the Mesh Simplification Example.

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#include <iostream>
using namespace std;
class TriangleCounter : public ModelData_Model::VoidElementVisitor
{
public:
class PolyRepExplorer : public ModelData_Part::VoidRepresentationVisitor
{
public:
void operator() (const ModelData_PolyRepresentation& theRep) override
{
const auto& aShapeList = theRep.Get();
for (size_t i = 0; i < aShapeList.Size(); i++) {
ModelData_PolyShape aShape = aShapeList.Element (i);
const auto& anITS = static_cast <const ModelData_IndexedTriangleSet&> (aShape);
myNumberOfTriangles += anITS.NumberOfFaces();
}
}
}
size_t myNumberOfTriangles = 0;
};
void operator() (const ModelData_Part& thePart) override
{
PolyRepExplorer aRepExplorer;
thePart.Accept (aRepExplorer);
myNumberOfTriangles += aRepExplorer.myNumberOfTriangles;
}
size_t NumberOfTriangles() const
{ return myNumberOfTriangles; }
private:
size_t myNumberOfTriangles = 0;
};
int main (int argc, char *argv[])
{
return 1;
}
if (argc != 3) {
cerr << "Usage: " << argv[0] << " <input_file> <output_file>, where:" << endl;
cerr << " <input_file> is a name of the VRML file to be read" << endl;
cerr << " <output_file> is a name of the XML file to be saved" << endl;
return 1;
}
const char* aSource = argv[1];
cerr << "Failed to read the file " << aSource << endl;
return 1;
}
// Making a model data
cerr << "Failed to transfer model data to specified format" << endl;
return 1;
}
TriangleCounter aBeforeCounter;
aModel.Accept (aBeforeCounter);
cout << "Model name: " << aModel.Name() << endl;
cout << "# of triangles before: " << aBeforeCounter.NumberOfTriangles() << endl;
// Running the simplifier
aParams.SetDegreeOfSimplification (ModelSimplifier_MeshSimplifierParameters::High);
aSimplifier.SetParameters (aParams);
ModelData_Model aNewModel = aSimplifier.Perform (aModel);
// How many triangles does simplified model contain?
TriangleCounter anAfterCounter;
aNewModel.Accept (anAfterCounter);
cout << "# of triangles after: " << anAfterCounter.NumberOfTriangles() << endl;
// Saving the simplified model