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Java implementation of BSP based CSG (Constructive Solid Geometry)
There is a newer version: 0.5.7
/**
 * Text3d.java
 *
 * Copyright 2014-2016 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.lang.reflect.Field;
import java.util.ArrayList;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.fxyz.shapes.primitives.Text3DMesh;
import org.fxyz.shapes.primitives.TexturedMesh;
import org.fxyz.utils.MeshUtils;

/**
 * 3d text primitive. 
 * 
 * @author Michael Hoffer 
 */
public class Text3d implements Primitive {

    private final PropertyStorage properties = new PropertyStorage();

    private final String text;
    private String fontName;
    private double size;
    private double depth;
    Text3DMesh t3dMesh;
    private boolean noCenter;

    // 08.11.2016
    // TODO report bug to FXyz authors
    // factor by which we multiply text generation to minimize rendering errors
    double scaleFactor = 100;

    /**
     * Constructor.
     * 
     * @param text text
     */
    public Text3d(String text) {
        this(text, "Arial", 12, 1.0);
    }

    /**
     * Constructor.
     * 
     * @param text text
     * @param depth text depth (z thickness)
     */
    public Text3d(String text, double depth) {
        this(text, "Arial", 12, depth);
    }

    /**
     * Constructor. 
     * 
     * @param text text
     * @param fontName font name, e.g., "Arial"
     * @param fontSize font size
     * @param depth text depth (z thickness)
     */
    public Text3d(String text, String fontName, double fontSize, double depth) {
        this.text = text;
        this.fontName = fontName;
        this.size = fontSize;
        this.depth = depth;

        // scaled size and height (see scaleFactor docs)
        int realSize = (int) (fontSize * scaleFactor);
        double realHeight = depth * scaleFactor;

        t3dMesh = new Text3DMesh(
                text, fontName, realSize, false, realHeight, 0, 0);
    }

    @Override
    public List toPolygons() {
        return new MeshRetriever(this).toCSG(noCenter).getPolygons();
    }

    @Override
    public PropertyStorage getProperties() {
        return properties;
    }

    public Text3d noCenter() {
        this.noCenter = true;

        return this;
    }

}

class MeshRetriever {

    private final Text3d t3dMesh;

    public MeshRetriever(Text3d t3dMesh) {
        this.t3dMesh = t3dMesh;
    }

    public CSG toCSG(boolean noCenter) {
        List csgs = new ArrayList<>();

        CSG result = null;

        List meshes = getMeshes();

        for (int i = 0; i < meshes.size(); i++) {

            TexturedMesh mesh = meshes.get(i);

            CSG csg = MeshUtils.mesh2CSG(mesh);

            double xTransform = mesh.getTransforms().stream().
                    mapToDouble(tr -> tr.getTx()).sum();

            csg = csg.transformed(Transform.unity().translateX(xTransform));

            // rescale final mesh (see scaleFactor docs)
            double xScale = 1.0 / t3dMesh.scaleFactor;
            csg = csg.transformed(Transform.unity().
                    scale(xScale, -xScale, xScale));

            if (result == null) {
                result = csg;
            } else {
                result = result.dumbUnion(csg);
            }
        }

        if (!noCenter) {
            result = result.transformed(
                    Transform.unity().translate(
                            -result.getBounds().getBounds().x * 0.5,
                            -result.getBounds().getBounds().y * 0.5,
                            -result.getBounds().getBounds().z * 0.5)
            );
        }

        return result;
    }

    public List getMeshes() {
        try {
            Field field = Text3DMesh.class.getDeclaredField("meshes");

            field.setAccessible(true);

            return (List) field.get(t3dMesh.t3dMesh);
        } catch (NoSuchFieldException ex) {
            Logger.getLogger(MeshRetriever.class.getName()).
                    log(Level.SEVERE, null, ex);
        } catch (SecurityException ex) {
            Logger.getLogger(MeshRetriever.class.getName()).
                    log(Level.SEVERE, null, ex);
        } catch (IllegalArgumentException ex) {
            Logger.getLogger(MeshRetriever.class.getName()).
                    log(Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            Logger.getLogger(MeshRetriever.class.getName()).
                    log(Level.SEVERE, null, ex);
        }

        return null;
    }
}