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Java implementation of BSP based CSG (Constructive Solid Geometry)
There is a newer version: 0.5.7

/**
 * STL.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 eu.mihosoft.vrl.v3d.ext.imagej.STLLoader;
import java.io.IOException;
import java.nio.file.Path;
import java.util.ArrayList;
import java.util.List;
import javax.vecmath.Point3f;

/**
 * Loads a CSG from stl.
 * 
 * @author Michael Hoffer <[email protected]>
 */
public class STL {
    /**
     * Loads a CSG from stl.
     * @param path file path
     * @return CSG
     * @throws IOException if loading failed
     */
    public static CSG file(Path path) throws IOException {
        STLLoader loader = new STLLoader();
        
        List polygons = new ArrayList<>();
        List vertices = new ArrayList<>();
        for(Point3f p :loader.parse(path.toFile())) {
            vertices.add(new Vector3d(p.x, p.y, p.z));
            if (vertices.size()==3) {
                polygons.add(Polygon.fromPoints(vertices));
                vertices = new ArrayList<>();
            }
        }
        
        return CSG.fromPolygons(new PropertyStorage(),polygons);
    }
}