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Java implementation of BSP based CSG (Constructive Solid Geometry)
There is a newer version: 0.5.7
/**
 * Main.java
 *
 * Copyright 2014-2014 Michael Hoffer . All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY Michael Hoffer  "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL Michael Hoffer  OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * The views and conclusions contained in the software and documentation are
 * those of the authors and should not be interpreted as representing official
 * policies, either expressed or implied, of Michael Hoffer
 * .
 */
package eu.mihosoft.vrl.v3d;

import java.io.IOException;
import java.nio.file.Paths;
import java.util.logging.Level;
import java.util.logging.Logger;
import javafx.scene.paint.Color;

/**
 *
 * @author Michael Hoffer <[email protected]>
 */
public class Main {

    public static void main(String[] args) throws IOException {

        // we use cube and sphere as base geometries
        CSG cube = new Cube(2).toCSG().color(Color.RED);
        CSG sphere = new Sphere(1.25).toCSG().color(Color.BLUE);
        CSG cyl = new Cylinder(0.5,3,16).toCSG().transformed(Transform.unity().translateZ(-1.5)).color(Color.GREEN);
        CSG cyl2 = cyl.transformed(Transform.unity().rotY(90));
        CSG cyl3 = cyl.transformed(Transform.unity().rotX(90));
        
        // perform union, difference and intersection
        CSG cubePlusSphere = cube.union(sphere);
        CSG cubeMinusSphere = cube.difference(sphere);
        CSG cubeIntersectSphere = cube.intersect(sphere);
        CSG cubeIntersectSphereCyl = cubeIntersectSphere.difference(cyl).difference(cyl2).difference(cyl3);

        // translate geometries to prevent overlapping 
        CSG union = cube.
                union(sphere.transformed(Transform.unity().translateX(3))).
                union(cyl.transformed(Transform.unity().translateX(6))).
                union(cubePlusSphere.transformed(Transform.unity().translateX(9))).
                union(cubeMinusSphere.transformed(Transform.unity().translateX(12))).
                union(cubeIntersectSphere.transformed(Transform.unity().translateX(15))).
                union(cubeIntersectSphereCyl.transformed(Transform.unity().translateX(18)));
        
        FileUtil.write(Paths.get("sample.stl"), union.toStlString());
        
        union.toObj().toFiles(Paths.get("sample-color.obj"));

    }
}