advgeom/meshsimplify/meshsimplify.java

Refer to the Mesh Simplification 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:
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
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//   this list of conditions and the following disclaimer.
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import cadex.*;
 
public class meshsimplify {
    static {
        try {
            System.loadLibrary("CadExCore");
            System.loadLibrary("CadExAdvGeom");
        } catch (UnsatisfiedLinkError e) {
            System.err.println("Native code library failed to load.\n" + e);
            System.exit(1);
        }
    }
 
    public static void main (String[] args) {
        String aKey = LicenseKey.Value();
 
        // Activate the license (aKey must be defined in LicenseKey.java)
        if (!LicenseManager.Activate(aKey)) {
            System.out.println("Failed to activate CAD Exchanger license.");
            System.exit(1);
        }
 
        if (args.length != 2) {
            System.err.println("Usage: " + " <input_file> <output_file>, where:");
            System.err.println("    <input_file>  is a name of the VRML file to be read        ");
            System.err.println("    <output_file> is a name of the CDX file to Save() the model");
            System.exit(1);
        }
 
        String aSource = args[0];
        String aDest = args[1];
 
        ModelData_Model aModel = new ModelData_Model();
 
        ModelData_ModelReader aReader = new ModelData_ModelReader();
 
        // Open and convert the file
        if (!aReader.Read(new Base_UTF16String(aSource), aModel)) {
            System.err.println("Failed to open and convert the file " + aSource);
            System.exit(1);
        }
 
        // Basic info about model
        TriangleCounter aBeforeCounter = new TriangleCounter();
        aModel.Accept(aBeforeCounter);
        System.out.println("Model name: " + aModel.Name());
        System.out.println("# of triangles before: " + String.valueOf(aBeforeCounter.NumberOfTriangles()));
 
        // Running the simplifier
        ModelSimplifier_MeshSimplifierParameters aParams = new ModelSimplifier_MeshSimplifierParameters();
        aParams.SetDegreeOfSimplification(ModelSimplifier_MeshSimplifierParameters.DegreeOfSimplificationType.High);
 
        ModelSimplifier_MeshSimplifier aSimplifier = new ModelSimplifier_MeshSimplifier();
        aSimplifier.SetParameters(aParams);
        ModelData_Model aNewModel = aSimplifier.Perform(aModel);
 
        // How many triangles does simplified model contain?
        TriangleCounter anAfterCounter = new TriangleCounter();
        aNewModel.Accept(anAfterCounter);
        System.out.println("# of triangles after: " + String.valueOf(anAfterCounter.NumberOfTriangles()));
 
        // Saving the simplified model
        if (!new ModelData_ModelWriter().Write(aNewModel, new Base_UTF16String(aDest))) {
            System.err.println("Failed to write the file " + aDest);
            System.exit(1);
        }
    }
}
 
class TriangleCounter extends ModelData_Model.VoidElementVisitor {
 
    class PolyRepExplorer extends ModelData_Part.VoidRepresentationVisitor {
        public int myNumberOfTriangles = 0;
 
        @Override
        public void Apply(ModelData_PolyRepresentation theRep) {
            ModelData_PolyShapeList aShapeList = theRep.Get();
            for (int i = 0; i < aShapeList.Size(); i++) {
                ModelData_PolyShape aShape = aShapeList.Element(i);
                if (aShape.TypeId() == ModelData_IndexedTriangleSet.GetTypeId()) {
                    ModelData_IndexedTriangleSet anITS = ModelData_IndexedTriangleSet.Cast(aShape);
                    myNumberOfTriangles += anITS.NumberOfFaces();
                }
            }
        }
    }
 
    private int myNumberOfTriangles = 0;
 
    @Override
    public void Apply(ModelData_Part thePart) {
        PolyRepExplorer aRepExplorer = new PolyRepExplorer();
        thePart.Accept(aRepExplorer);
        myNumberOfTriangles += aRepExplorer.myNumberOfTriangles;
    }
 
    public final int NumberOfTriangles() { return myNumberOfTriangles; }
 
};