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Java implementation of BSP based CSG (Constructive Solid Geometry)

There is a newer version: 0.5.7

/*
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package eu.mihosoft.vrl.v3d.samples;

import eu.mihosoft.vrl.v3d.CSG;
import eu.mihosoft.vrl.v3d.Cylinder;
import eu.mihosoft.vrl.v3d.Edge;
import eu.mihosoft.vrl.v3d.FileUtil;
import eu.mihosoft.vrl.v3d.Polygon;
import eu.mihosoft.vrl.v3d.Sphere;
import static eu.mihosoft.vrl.v3d.Transform.unity;
import eu.mihosoft.vrl.v3d.Vector3d;
import java.io.IOException;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.Stream;

/**
 * Average Chicken Egg.
 *
 * @author Michael Hoffer <[email protected]>
 */
public class EdgeTest {

    public CSG toCSG(boolean optimized) {
        double radius = 22;
        double stretch = 1.50;
        int resolution = 64;

        CSG cylinder = new Cylinder(1, 0.3, 8).toCSG();

        CSG sphere = new Sphere(0.1, 8, 4).toCSG().transformed(unity().translateZ(0.15));

        CSG cyl = new Cylinder(0.08, 0.3, 8).toCSG();

//        CSG csg = cylinder.difference(cyl).union(sphere);
        CSG csg = cylinder.difference(cyl);
//        CSG csg = cylinder.union(sphere);

        if (!optimized) {
            return csg;
        } else {

            List boundaryPolygons = Edge.boundaryPolygons(csg);

            System.out.println("#groups: " + boundaryPolygons.size());

//        List polys = boundaryPolygons.stream().peek(p->System.out.println("verts: "+p.vertices)).map(p->PolygonUtil.concaveToConvex(p)).flatMap(pList->pList.stream()).collect(Collectors.toList());
            return CSG.fromPolygons(boundaryPolygons);
        }

//        return csg;
    }

    public static void main(String[] args) throws IOException {
        FileUtil.write(Paths.get("edge-test.stl"), new EdgeTest().toCSG(true).toStlString());
        FileUtil.write(Paths.get("edge-test-orig.stl"), new EdgeTest().toCSG(false).toStlString());
    }
}