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How to use multitexturing in Java3D E-mail
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This Java tip shows how to use multi-texturing in Java3D.


Image

import java.applet.Applet;
import java.awt.BorderLayout;
import java.awt.Choice;
import java.awt.GraphicsConfiguration;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.awt.image.BufferedImage;

import javax.media.j3d.Appearance;
import javax.media.j3d.BoundingSphere;
import javax.media.j3d.BranchGroup;
import javax.media.j3d.Canvas3D;
import javax.media.j3d.DirectionalLight;
import javax.media.j3d.ImageComponent;
import javax.media.j3d.ImageComponent2D;
import javax.media.j3d.Texture;
import javax.media.j3d.Texture2D;
import javax.media.j3d.TextureAttributes;
import javax.media.j3d.TextureUnitState;
import javax.media.j3d.Transform3D;
import javax.media.j3d.TransformGroup;
import javax.vecmath.Color3f;
import javax.vecmath.Point3d;
import javax.vecmath.Vector3f;

import com.sun.j3d.utils.applet.MainFrame;
import com.sun.j3d.utils.behaviors.vp.OrbitBehavior;
import com.sun.j3d.utils.geometry.Box;
import com.sun.j3d.utils.image.TextureLoader;
import com.sun.j3d.utils.universe.SimpleUniverse;
import com.sun.j3d.utils.universe.ViewingPlatform;

public class MultiTextureTest extends Applet implements ItemListener {

  Choice choice;

  TextureUnitState textureUnitState[] new TextureUnitState[2];

  Texture stoneTex;

  Texture skyTex;

  Texture lightTex;

  private java.net.URL stoneImage = null;

  private java.net.URL skyImage = null;

  private SimpleUniverse u = null;

  public Texture createLightMap() {

    int width = 128;
    int height = 128;
    BufferedImage bimage = new BufferedImage(width, height,
        BufferedImage.TYPE_INT_RGB);
    int[] rgbArray = new int[width * height];
    int index, index2;
    int rgbInc = 256 (width / 20);
    int rgbValue = 0;
    int k = width / 5;
    int i, j, rgb;

    rgb = 0xff;
    rgbValue = rgb | (rgb << 8(rgb << 16(rgb << 24);
    for (i = width / 1, j = 0; j < 10; j++, i--) {
      rgbArray[i= rgbValue;
    }

    for (; i > 8; i--, rgb -= rgbInc) {
      rgbValue = rgb | (rgb << 8(rgb << 16(rgb << 24);
      rgbArray[i= rgbValue;
    }

    for (; i >= 0; i--) {
      rgbArray[i= rgbValue;
    }

    for (i = 0; i < width / 2; i++) {
      rgbValue = rgbArray[i];
      index = i;
      index2 = (width - i - 1);
      for (j = 0; j < height; j++) {
        rgbArray[index= rgbArray[index2= rgbValue;
        index += width;
        index2 += width;
      }
    }

    bimage.setRGB(00, width, height, rgbArray, 0, width);

    ImageComponent2D grayImage = new ImageComponent2D(
        ImageComponent.FORMAT_RGB, bimage);

    lightTex = new Texture2D(Texture.BASE_LEVEL, Texture.RGB, width, height);
    lightTex.setImage(0, grayImage);

    return lightTex;
  }

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

    // Create a Transformgroup to scale all objects so they
    // appear in the scene.
    TransformGroup objScale = new TransformGroup();
    Transform3D t3d = new Transform3D();
    t3d.setScale(0.4);
    objScale.setTransform(t3d);
    objRoot.addChild(objScale);

    TransformGroup objTrans = new TransformGroup();
    //write-enable for behaviors
    objTrans.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
    objTrans.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
    objTrans.setCapability(TransformGroup.ENABLE_PICK_REPORTING);
    objScale.addChild(objTrans);

    Appearance ap = new Appearance();

    // load textures
    TextureAttributes texAttr1 = new TextureAttributes();
    texAttr1.setTextureMode(TextureAttributes.DECAL);
    TextureAttributes texAttr2 = new TextureAttributes();
    texAttr2.setTextureMode(TextureAttributes.MODULATE);

    TextureLoader tex = new TextureLoader(stoneImage, new String("RGB"),
        this);
    if (tex == null)
      return null;
    stoneTex = tex.getTexture();

    tex = new TextureLoader(skyImage, new String("RGB")this);
    if (tex == null)
      return null;
    skyTex = tex.getTexture();

    lightTex = createLightMap();

    textureUnitState[0new TextureUnitState(stoneTex, texAttr1, null);
    textureUnitState[0].setCapability(TextureUnitState.ALLOW_STATE_WRITE);

    textureUnitState[1new TextureUnitState(lightTex, texAttr2, null);
    textureUnitState[1].setCapability(TextureUnitState.ALLOW_STATE_WRITE);

    ap.setTextureUnitState(textureUnitState);

    //Create a Box
    Box BoxObj = new Box(1.5f1.5f0.8f, Box.GENERATE_NORMALS
        | Box.GENERATE_TEXTURE_COORDS, ap, 2);
    // add it to the scene graph.
    objTrans.addChild(BoxObj);

    BoundingSphere bounds = new BoundingSphere(new Point3d(0.00.00.0),
        100.0);

    //Shine it with two lights.
    Color3f lColor1 = new Color3f(0.7f0.7f0.7f);
    Color3f lColor2 = new Color3f(0.2f0.2f0.1f);
    Vector3f lDir1 = new Vector3f(-1.0f, -1.0f, -1.0f);
    Vector3f lDir2 = new Vector3f(0.0f0.0f, -1.0f);
    DirectionalLight lgt1 = new DirectionalLight(lColor1, lDir1);
    DirectionalLight lgt2 = new DirectionalLight(lColor2, lDir2);
    lgt1.setInfluencingBounds(bounds);
    lgt2.setInfluencingBounds(bounds);
    objScale.addChild(lgt1);
    objScale.addChild(lgt2);

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

    return objRoot;
  }

  public MultiTextureTest() {
  }

  public MultiTextureTest(java.net.URL stoneURL, java.net.URL skyURL) {
    stoneImage = stoneURL;
    skyImage = skyURL;
  }

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

    if (skyImage == null) {
      // the path to the image for an applet
      try {
        skyImage = new java.net.URL(getCodeBase().toString()
            "/bg.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);

    BranchGroup scene = createSceneGraph();
    u = new SimpleUniverse(c);

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

    // add orbit behavior but disable translate
    OrbitBehavior orbit = new OrbitBehavior(c, OrbitBehavior.REVERSE_ALL
        | OrbitBehavior.DISABLE_TRANSLATE);
    BoundingSphere bounds = new BoundingSphere(new Point3d(0.00.00.0),
        100.0);
    orbit.setSchedulingBounds(bounds);
    viewingPlatform.setViewPlatformBehavior(orbit);

    u.addBranchGraph(scene);

    // create the gui
    choice = new Choice();
    choice.addItem("stone + light");
    choice.addItem("stone");
    choice.addItem("lightMap");
    choice.addItem("sky");
    choice.addItem("stone + sky");
    choice.addItemListener(this);
    add("North", choice);

  }

  public void destroy() {
    // Cleanup reference to Java3D
    textureUnitState = new TextureUnitState[2];
    u.cleanup();
  }

  public void itemStateChanged(ItemEvent e) {
    int index = choice.getSelectedIndex();

    switch (index) {
    case 0/* stone + light */
      textureUnitState[0].setTexture(stoneTex);
      textureUnitState[1].setTexture(lightTex);
      break;
    case 1/* stone */
      textureUnitState[0].setTexture(stoneTex);
      textureUnitState[1].setTexture(null);
      break;
    case 2/* light */
      textureUnitState[0].setTexture(null);
      textureUnitState[1].setTexture(lightTex);
      break;
    case 3/* sky */
      textureUnitState[0].setTexture(null);
      textureUnitState[1].setTexture(skyTex);
      break;
    case 4/* stone + sky */
      textureUnitState[0].setTexture(stoneTex);
      textureUnitState[1].setTexture(skyTex);
      break;
    default/* both */
      break;
    }
  }

  public static void main(String argv[]) {
    java.net.URL stoneURL = null;
    java.net.URL skyURL = null;
    // the path to the image for an application
    try {
      stoneURL = new java.net.URL("file:stone.jpg");
      skyURL = new java.net.URL("file:bg.jpg");
    catch (java.net.MalformedURLException ex) {
      System.out.println(ex.getMessage());
      System.exit(1);
    }
    new MainFrame(new MultiTextureTest(stoneURL, skyURL)750750);
  }
}

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