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How to use a billboard node E-mail
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This Java tip demonstrates the use of a billboard node. Two cubes are created, one yellow and the other with a a different colour on each face. The billboard is created so that the red face of the right cube is always facing the viewer. A key board utility class is used to allow modification of the view angle.


Image

import java.awt.BorderLayout;
import java.awt.Button;
import java.awt.Frame;
import java.awt.Panel;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.media.j3d.AmbientLight;
import javax.media.j3d.Appearance;
import javax.media.j3d.Billboard;
import javax.media.j3d.BoundingLeaf;
import javax.media.j3d.BoundingSphere;
import javax.media.j3d.BranchGroup;
import javax.media.j3d.Canvas3D;
import javax.media.j3d.DirectionalLight;
import javax.media.j3d.Locale;
import javax.media.j3d.Material;
import javax.media.j3d.PhysicalBody;
import javax.media.j3d.PhysicalEnvironment;
import javax.media.j3d.Transform3D;
import javax.media.j3d.TransformGroup;
import javax.media.j3d.View;
import javax.media.j3d.ViewPlatform;
import javax.media.j3d.VirtualUniverse;
import javax.vecmath.Color3f;
import javax.vecmath.Point3d;
import javax.vecmath.Vector3d;
import javax.vecmath.Vector3f;

import com.sun.j3d.utils.behaviors.keyboard.KeyNavigatorBehavior;
import com.sun.j3d.utils.geometry.Box;
import com.sun.j3d.utils.geometry.ColorCube;

/**
 * This application demonstrates the use of a billboard node. Two cubes are
 * created, one yellow and the other with a a different colour on each face. The
 * billboard is created so that the red face of the right cube is always facing
 * the viewer. A key board utility class is used to allow modification of the
 * view angle.
 
 @author I.J.Palmer
 @version 1.0
 */
public class SimpleBillboard extends Frame implements ActionListener {
  protected Canvas3D myCanvas3D = new Canvas3D(null);

  protected Button exitButton = new Button("Exit");

  protected BoundingSphere bounds = new BoundingSphere(new Point3d(0.00.0,
      0.0)100.0);

  /**
   * Build the view branch of the scene graph. In this case a key navigation
   * utility object is created and associated with the view transform so that
   * the view can be changed via the keyboard.
   
   @return BranchGroup that is the root of the view branch
   */
  protected BranchGroup buildViewBranch(Canvas3D c) {
    BranchGroup viewBranch = new BranchGroup();
    Transform3D viewXfm = new Transform3D();
    viewXfm.set(new Vector3f(0.0f0.0f10.0f));
    TransformGroup viewXfmGroup = new TransformGroup(viewXfm);
    viewXfmGroup.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
    viewXfmGroup.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
    BoundingSphere movingBounds = new BoundingSphere(new Point3d(0.00.0,
        0.0)100.0);
    BoundingLeaf boundLeaf = new BoundingLeaf(movingBounds);
    ViewPlatform myViewPlatform = new ViewPlatform();
    viewXfmGroup.addChild(boundLeaf);
    PhysicalBody myBody = new PhysicalBody();
    PhysicalEnvironment myEnvironment = new PhysicalEnvironment();
    viewXfmGroup.addChild(myViewPlatform);
    viewBranch.addChild(viewXfmGroup);
    View myView = new View();
    myView.addCanvas3D(c);
    myView.attachViewPlatform(myViewPlatform);
    myView.setPhysicalBody(myBody);
    myView.setPhysicalEnvironment(myEnvironment);

    KeyNavigatorBehavior keyNav = new KeyNavigatorBehavior(viewXfmGroup);
    keyNav.setSchedulingBounds(movingBounds);
    viewBranch.addChild(keyNav);

    return viewBranch;
  }

  /**
   * Add some lights to the scene graph
   
   @param b
   *            BranchGroup that the lights are added to
   */
  protected void addLights(BranchGroup b) {
    Color3f ambLightColour = new Color3f(0.5f0.5f0.5f);
    AmbientLight ambLight = new AmbientLight(ambLightColour);
    ambLight.setInfluencingBounds(bounds);
    Color3f dirLightColour = new Color3f(1.0f1.0f1.0f);
    Vector3f dirLightDir = new Vector3f(-1.0f, -1.0f, -1.0f);
    DirectionalLight dirLight = new DirectionalLight(dirLightColour,
        dirLightDir);
    dirLight.setInfluencingBounds(bounds);
    b.addChild(ambLight);
    b.addChild(dirLight);
  }

  /**
   * Build the content branch for the scene graph. This creates two cubes and
   * uses a billboard node to keep one face of one of the cubes facing the
   * viewer.
   
   @return BranchGroup that is the root of the content
   */
  protected BranchGroup buildContentBranch() {
    //Create the appearance
    Appearance app = new Appearance();
    Color3f ambientColour = new Color3f(1.0f1.0f0.0f);
    Color3f emissiveColour = new Color3f(0.0f0.0f0.0f);
    Color3f specularColour = new Color3f(1.0f1.0f1.0f);
    Color3f diffuseColour = new Color3f(1.0f1.0f0.0f);
    float shininess = 20.0f;
    app.setMaterial(new Material(ambientColour, emissiveColour,
        diffuseColour, specularColour, shininess));
    //Make the cubes
    Box leftCube = new Box(1.0f1.0f1.0f, app);
    ColorCube rightCube = new ColorCube();
    //Create the transformgroup used for the billboard
    TransformGroup billBoardGroup = new TransformGroup();
    //Set the access rights to the group
    billBoardGroup.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
    //Add the cube to the group
    billBoardGroup.addChild(rightCube);
    //Create and activate the billboard
    Billboard myBillboard = new Billboard(billBoardGroup,
        Billboard.ROTATE_ABOUT_AXIS, new Vector3f(0.0f1.0f0.0f));
    myBillboard.setSchedulingBounds(bounds);
    BranchGroup contentBranch = new BranchGroup();
    contentBranch.addChild(myBillboard);
    addLights(contentBranch);
    //Position the cubes
    TransformGroup bothGroup = new TransformGroup();
    Transform3D leftGroupXfm = new Transform3D();
    leftGroupXfm.set(new Vector3d(-1.50.00.0));
    TransformGroup leftGroup = new TransformGroup(leftGroupXfm);
    Transform3D rightGroupXfm = new Transform3D();
    rightGroupXfm.set(new Vector3d(1.50.00.0));
    TransformGroup rightGroup = new TransformGroup(rightGroupXfm);
    //Put it all together
    bothGroup.addChild(leftGroup);
    leftGroup.addChild(leftCube);
    bothGroup.addChild(rightGroup);
    rightGroup.addChild(billBoardGroup);
    contentBranch.addChild(bothGroup);
    return contentBranch;

  }

  /**
   * Use the action event of the exit button to end the application.
   */
  public void actionPerformed(ActionEvent e) {
    dispose();
    System.exit(0);
  }

  public SimpleBillboard() {
    VirtualUniverse myUniverse = new VirtualUniverse();
    Locale myLocale = new Locale(myUniverse);
    myLocale.addBranchGraph(buildViewBranch(myCanvas3D));
    myLocale.addBranchGraph(buildContentBranch());
    setTitle("SimpleBillboard");
    setSize(400400);
    setLayout(new BorderLayout());
    Panel bottom = new Panel();
    bottom.add(exitButton);
    add(BorderLayout.CENTER, myCanvas3D);
    add(BorderLayout.SOUTH, bottom);
    exitButton.addActionListener(this);
    setVisible(true);
  }

  public static void main(String[] args) {
    SimpleBillboard sw = new SimpleBillboard();
  }
}           

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