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How to apply a Texture Image to a Cube E-mail
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This Java tip shows how to apply a Texture Image to a Cube with Java3D.


Image

import java.applet.Applet;
import java.awt.BorderLayout;
import java.awt.GraphicsConfiguration;

import javax.media.j3d.Alpha;
import javax.media.j3d.Appearance;
import javax.media.j3d.BoundingSphere;
import javax.media.j3d.BranchGroup;
import javax.media.j3d.Canvas3D;
import javax.media.j3d.RotationInterpolator;
import javax.media.j3d.Texture;
import javax.media.j3d.TextureAttributes;
import javax.media.j3d.Transform3D;
import javax.media.j3d.TransformGroup;
import javax.vecmath.Point3d;

import com.sun.j3d.utils.applet.MainFrame;
import com.sun.j3d.utils.geometry.Box;
import com.sun.j3d.utils.image.TextureLoader;
import com.sun.j3d.utils.universe.SimpleUniverse;

public class TextureImage extends Applet {

  private java.net.URL texImage = null;

  private SimpleUniverse u = null;

  public BranchGroup createSceneGraph() {
    // Create the root of the branch graph
    BranchGroup objRoot = new BranchGroup();

    // Create the transform group node and initialize it to the
    // identity. Enable the TRANSFORM_WRITE capability so that
    // our behavior code can modify it at runtime. Add it to the
    // root of the subgraph.
    TransformGroup objTrans = new TransformGroup();
    objTrans.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
    objRoot.addChild(objTrans);

    // Create appearance object for textured cube
    Appearance app = new Appearance();
    Texture tex = new TextureLoader(texImage, this).getTexture();
    app.setTexture(tex);
    TextureAttributes texAttr = new TextureAttributes();
    texAttr.setTextureMode(TextureAttributes.MODULATE);
    app.setTextureAttributes(texAttr);

    // Create textured cube and add it to the scene graph.
    Box textureCube = new Box(0.4f0.4f0.4f,
        Box.GENERATE_TEXTURE_COORDS, app);
    objTrans.addChild(textureCube);

    // Create a new Behavior object that will perform the desired
    // operation on the specified transform object and add it into
    // the scene graph.
    Transform3D yAxis = new Transform3D();
    Alpha rotationAlpha = new Alpha(-1, Alpha.INCREASING_ENABLE, 00,
        400000000);

    RotationInterpolator rotator = new RotationInterpolator(rotationAlpha,
        objTrans, yAxis, 0.0f(floatMath.PI * 2.0f);
    BoundingSphere bounds = new BoundingSphere(new Point3d(0.00.00.0),
        100.0);
    rotator.setSchedulingBounds(bounds);
    objTrans.addChild(rotator);

    // Have Java 3D perform optimizations on this scene graph.
    objRoot.compile();

    return objRoot;
  }

  public TextureImage() {
  }

  public TextureImage(java.net.URL url) {
    texImage = url;
  }

  public void init() {
    if (texImage == null) {
      // the path to the image for an applet
      try {
        texImage = new java.net.URL(getCodeBase().toString()
            "/stone.jpg");
      catch (java.net.MalformedURLException ex) {
        System.out.println(ex.getMessage());
        System.exit(1);
      }
    }
    setLayout(new BorderLayout());
    GraphicsConfiguration config = SimpleUniverse
        .getPreferredConfiguration();

    Canvas3D c = new Canvas3D(config);
    add("Center", c);

    // Create a simple scene and attach it to the virtual universe
    BranchGroup scene = createSceneGraph();
    u = new SimpleUniverse(c);

    // This will move the ViewPlatform back a bit so the
    // objects in the scene can be viewed.
    u.getViewingPlatform().setNominalViewingTransform();

    u.addBranchGraph(scene);
  }

  public void destroy() {
    u.cleanup();
  }

  //
  // The following allows TextureImage to be run as an application
  // as well as an applet
  //
  public static void main(String[] args) {
    java.net.URL url = null;
    if (args.length > 0) {
      try {
        url = new java.net.URL("file:" + args[0]);
      catch (java.net.MalformedURLException ex) {
        System.out.println(ex.getMessage());
        System.exit(1);
      }
    else {
      // the path to the image for an application
      try {
        url = new java.net.URL("file:stone.jpg");
      catch (java.net.MalformedURLException ex) {
        System.out.println(ex.getMessage());
        System.exit(1);
      }
    }
    new MainFrame(new TextureImage(url)256256);
  }

}

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