6.11 Morphing

/*
 *        @(#)Morphing.java 1.24 02/10/21 13:45:46
 * Copyright (c) 1996-2002 Sun Microsystems, Inc.
 * All Rights Reserved.
 */

import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;
import com.sun.j3d.utils.applet.MainFrame;
import com.sun.j3d.utils.universe.*;
import javax.media.j3d.*;
import javax.vecmath.*;
import java.io.*;
import com.sun.j3d.loaders.objectfile.ObjectFile;
import com.sun.j3d.loaders.Scene;
import com.sun.j3d.loaders.ParsingErrorException;
import com.sun.j3d.loaders.IncorrectFormatException;

public class Morphing extends Applet {

  private java.net.URL[] objFiles = null;

  private SimpleUniverse u = null;

  private BranchGroup createSceneGraph() {
    BranchGroup objRoot = new BranchGroup();
    TransformGroup objScale = new TransformGroup();
    Transform3D t3d = new Transform3D();
    t3d.setScale(0.4);
    objScale.setTransform(t3d);
    objRoot.addChild(objScale);

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

    Color3f bgColor = new Color3f(0.05f, 0.05f, 0.2f);
    Background bg = new Background(bgColor);
    bg.setApplicationBounds(bounds);
    objScale.addChild(bg);

    Color3f lColor1 = new Color3f(0.7f, 0.7f, 0.7f);
    Vector3f lDir1  = new Vector3f(-1.0f, -1.0f, -1.0f);
    Color3f alColor = new Color3f(0.2f, 0.2f, 0.2f);

    AmbientLight aLgt = new AmbientLight(alColor);
    aLgt.setInfluencingBounds(bounds);
    DirectionalLight lgt1 =
      new DirectionalLight(lColor1, lDir1);
    lgt1.setInfluencingBounds(bounds);
    objScale.addChild(aLgt);
    objScale.addChild(lgt1);
    TransformGroup objTrans[] = new TransformGroup[4];

    for(int i=0; i<4; i++) {
      objTrans[i] = new TransformGroup();
      objScale.addChild(objTrans[i]);
    }

    Transform3D tr = new Transform3D();
    Transform3D rotX90 = new Transform3D();
    rotX90.rotX(90.0 * Math.PI / 180.0);

    objTrans[0].getTransform(tr);
    tr.setTranslation(new Vector3d(-2.0, 1.5, -2.0));
    tr.mul(rotX90);
    objTrans[0].setTransform(tr);

    objTrans[1].getTransform(tr);
    tr.setTranslation(new Vector3d(0.0, 1.5, -2.0));
    tr.mul(rotX90);
    objTrans[1].setTransform(tr);

    objTrans[2].getTransform(tr);
    tr.setTranslation(new Vector3d(2.0, 1.5, -2.0));
    tr.mul(rotX90);
    objTrans[2].setTransform(tr);

    objTrans[3].getTransform(tr);
    tr.setTranslation(new Vector3d(0.0, -2.0, -2.0));
    tr.mul(rotX90);
    objTrans[3].setTransform(tr);

    Scene s[] = new Scene[3];
    GeometryArray g[] = new GeometryArray[3];
    Shape3D shape[] = new Shape3D[3];
    ObjectFile loader =
      new ObjectFile(ObjectFile.RESIZE);
    for(int i=0; i<3; i++) {
      s[i] = null;
      g[i] = null;
      shape[i] = null;
    }

    for(int i=0; i<3;i++) {
      try {
        s[i] = loader.load(objFiles[i]);
      }
      catch (FileNotFoundException e) {
        System.err.println(e);
        System.exit(1);
      }
      catch (ParsingErrorException e) {
        System.err.println(e);
        System.exit(1);
      }
      catch (IncorrectFormatException e) {
        System.err.println(e);
        System.exit(1);
      }

      BranchGroup b = s[i].getSceneGroup();
      shape[i] = (Shape3D) b.getChild(0);
      g[i] = (GeometryArray) shape[i].getGeometry();

      shape[i].setGeometry(g[i]);
      objTrans[i].addChild(b);
    }
    Appearance app = new Appearance();
    Color3f objColor = new Color3f(1.0f, 0.7f, 0.8f);
    Color3f black = new Color3f(0.0f, 0.0f, 0.0f);
    app.setMaterial(new Material(objColor,
                                 black,
                                 objColor,
                                 black, 80.0f));
    Morph morph = new Morph(g, app);
    morph.setCapability(Morph.ALLOW_WEIGHTS_READ);
    morph.setCapability(Morph.ALLOW_WEIGHTS_WRITE);

    objTrans[3].addChild(morph);
    Alpha morphAlpha =
      new Alpha(-1, Alpha.INCREASING_ENABLE |
                Alpha.DECREASING_ENABLE,
                0, 0,
                2000, 1000, 200,
                2000, 1000, 200);
    MorphingBehavior mBeh =
      new MorphingBehavior(morphAlpha, morph);
    mBeh.setSchedulingBounds(bounds);
    objScale.addChild(mBeh);

    return objRoot;
  }

  public Morphing() {}

  public Morphing(java.net.URL[] urls) {
    objFiles = urls;
  }

  public void init() {
    if (objFiles == null) {
      objFiles = new java.net.URL[3];
      String path = getCodeBase().toString();
      try {
        objFiles[0] =
          new java.net.URL(path + "hand1.obj");
        objFiles[1] =
          new java.net.URL(path + "hand2.obj");
        objFiles[2] =
          new java.net.URL(path + "hand3.obj");
      }
      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);
    u.getViewingPlatform().setNominalViewingTransform();

    u.addBranchGraph(scene);
  }

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

  public static void main(String[] args) {
    java.net.URL[] urls = new java.net.URL[3];
    try {
      urls[0] = new java.net.URL("file:./hand1.obj");
      urls[1] = new java.net.URL("file:./hand2.obj");
      urls[2] = new java.net.URL("file:./hand3.obj");
    }
    catch (java.net.MalformedURLException ex) {
      System.out.println(ex.getMessage());
      System.exit(1);
    }
    new MainFrame(new Morphing(urls), 700, 700);
  }
}

/*
 *MorphingBehavior.java 1.11 02/04/01 15:03:19
 * Copyright (c) 1996-2002 Sun Microsystems, Inc.
 * All Rights Reserved.
 */

import java.util.Enumeration;
import javax.media.j3d.*;
import javax.vecmath.*;

public class MorphingBehavior extends Behavior {
  Alpha alpha;
  Morph morph;
  double weights[];

  WakeupOnElapsedFrames w =
  new WakeupOnElapsedFrames(0);

  public void initialize() {
    alpha.setStartTime(System.currentTimeMillis());
    wakeupOn(w);
  }
  public void processStimulus(Enumeration criteria) {
    double val = alpha.value();
    if (val < 0.5) {
      double a = val * 2.0;
      weights[0] = 1.0 - a;
      weights[1] = a;
      weights[2] = 0.0;
    }
    else {
      double a = (val - 0.5) * 2.0;
      weights[0] = 0.0;
      weights[1] = 1.0f - a;
      weights[2] = a;
    }

    morph.setWeights(weights);
    wakeupOn(w);
  }

  public MorphingBehavior(Alpha a, Morph m) {
    alpha = a;
    morph = m;
    weights = morph.getWeights();
  }
}

�} 17: Morphing