loading a vrml file111.txt

关于java3D结合vrml文件开发虚拟现实的例子及源码.

import java.applet.Applet;
import java.awt.BorderLayout;
import java.awt.Cursor;
import java.awt.GraphicsConfigTemplate;
import java.awt.GraphicsDevice;
import java.awt.GraphicsEnvironment;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.io.File;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Hashtable;

import javax.media.j3d.AmbientLight;
import javax.media.j3d.AudioDevice;
import javax.media.j3d.Background;
import javax.media.j3d.BoundingSphere;
import javax.media.j3d.Bounds;
import javax.media.j3d.BranchGroup;
import javax.media.j3d.Canvas3D;
import javax.media.j3d.DirectionalLight;
import javax.media.j3d.GraphicsConfigTemplate3D;
import javax.media.j3d.Group;
import javax.media.j3d.Locale;
import javax.media.j3d.Morph;
import javax.media.j3d.Node;
import javax.media.j3d.PhysicalBody;
import javax.media.j3d.PhysicalEnvironment;
import javax.media.j3d.SceneGraphObject;
import javax.media.j3d.Shape3D;
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 com.sun.j3d.audioengines.javasound.JavaSoundMixer;
import com.sun.j3d.loaders.Scene;
import com.sun.j3d.loaders.vrml97.VrmlLoader;
import com.sun.j3d.utils.applet.MainFrame;
import com.sun.j3d.utils.behaviors.mouse.MouseRotate;
import com.sun.j3d.utils.behaviors.mouse.MouseTranslate;
import com.sun.j3d.utils.behaviors.mouse.MouseZoom;
import com.sun.j3d.utils.picking.PickCanvas;
import com.sun.j3d.utils.picking.PickResult;
import com.sun.j3d.utils.picking.PickTool;

/**
 * This example loads a VRML file, automatically computes the view point to view
 * the objects in the file, and then mouse picks. For each pick all the selected
 * components of the scene are reported (by their VRML name). The VRML scene can
 * be rotates, scaled and translated using the mouse.
 */
public class VrmlPickingTest extends Java3dApplet implements MouseListener {
  PickCanvas pickCanvas = null;

  public VrmlPickingTest() {
  }

  public VrmlPickingTest(String[] args) {
    saveCommandLineArguments(args);
    initJava3d();
  }

  public void start() {
    if (pickCanvas == null)
      initJava3d();
  }

  protected void addCanvas3D(Canvas3D c3d) {
    setLayout(new BorderLayout());
    add(c3d, BorderLayout.CENTER);
    doLayout();

    if (m_SceneBranchGroup != null) {
      c3d.addMouseListener(this);

      pickCanvas = new PickCanvas(c3d, m_SceneBranchGroup);
      pickCanvas.setMode(PickTool.GEOMETRY_INTERSECT_INFO);
      pickCanvas.setTolerance(4.0f);
    }

    c3d.setCursor(new Cursor(Cursor.HAND_CURSOR));
  }

  public TransformGroup[] getViewTransformGroupArray() {
    TransformGroup[] tgArray = new TransformGroup[1];
    tgArray[0] = new TransformGroup();

    Transform3D viewTrans = new Transform3D();
    Transform3D eyeTrans = new Transform3D();

    BoundingSphere sceneBounds = (BoundingSphere) m_SceneBranchGroup
        .getBounds();

    // point the view at the center of the object
    Point3d center = new Point3d();
    sceneBounds.getCenter(center);
    double radius = sceneBounds.getRadius();
    Vector3d temp = new Vector3d(center);
    viewTrans.set(temp);

    // pull the eye back far enough to see the whole object
    double eyeDist = 1.4 * radius / Math.tan(Math.toRadians(40) / 2.0);
    temp.x = 0.0;
    temp.y = 0.0;
    temp.z = eyeDist;
    eyeTrans.set(temp);
    viewTrans.mul(eyeTrans);

    // set the view transform
    tgArray[0].setTransform(viewTrans);

    return tgArray;
  }

  protected BranchGroup createSceneBranchGroup() {
    BranchGroup objRoot = super.createSceneBranchGroup();

    Bounds lightBounds = getApplicationBounds();

    AmbientLight ambLight = new AmbientLight(true, new Color3f(1.0f, 1.0f,
        1.0f));
    ambLight.setInfluencingBounds(lightBounds);
    objRoot.addChild(ambLight);

    DirectionalLight headLight = new DirectionalLight();
    headLight.setInfluencingBounds(lightBounds);
    objRoot.addChild(headLight);

    TransformGroup mouseGroup = createMouseBehaviorsGroup();

    String vrmlFile = null;

    try {
      URL codebase = getWorkingDirectory();
      vrmlFile = codebase.toExternalForm() + "BoxConeSphere.wrl";
    } catch (Exception e) {
      e.printStackTrace();
    }

    if (m_szCommandLineArray != null) {
      switch (m_szCommandLineArray.length) {
      case 0:
        break;

      case 1:
        vrmlFile = m_szCommandLineArray[0];
        break;

      default:
        System.err.println("Usage: VrmlPickingTest [pathname|URL]");
        System.exit(-1);
      }
    }

    BranchGroup sceneRoot = loadVrmlFile(vrmlFile);if (sceneRoot != null)
      mouseGroup.addChild(sceneRoot);

    objRoot.addChild(mouseGroup);

    return objRoot;
  }

  private TransformGroup createMouseBehaviorsGroup() {
    TransformGroup examineGroup = new TransformGroup();
    examineGroup.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
    examineGroup.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);

    Bounds behaviorBounds = getApplicationBounds();

    MouseRotate mr = new MouseRotate(examineGroup);
    mr.setSchedulingBounds(behaviorBounds);
    examineGroup.addChild(mr);

    MouseTranslate mt = new MouseTranslate(examineGroup);
    mt.setSchedulingBounds(behaviorBounds);
    examineGroup.addChild(mt);

    MouseZoom mz = new MouseZoom(examineGroup);
    mz.setSchedulingBounds(behaviorBounds);
    examineGroup.addChild(mz);

    return examineGroup;
  }

  private BranchGroup loadVrmlFile(String location) {
    BranchGroup sceneGroup = null;
    Scene scene = null;

    VrmlLoader loader = new VrmlLoader();

    try {
      URL loadUrl = new URL(location);
      try {
        // load the scene
        scene = loader.load(new URL(location));
      } catch (Exception e) {
        System.out.println("Exception loading URL:" + e);
        e.printStackTrace();
      }
    } catch (MalformedURLException badUrl) {
      // location may be a path name
      try {
        // load the scene
        scene = loader.load(location);
      } catch (Exception e) {
        System.out.println("Exception loading file from path:" + e);
        e.printStackTrace();
      }
    }

    if (scene != null) {
      // get the scene group
      sceneGroup = scene.getSceneGroup();

      sceneGroup.setCapability(BranchGroup.ALLOW_BOUNDS_READ);
      sceneGroup.setCapability(BranchGroup.ALLOW_CHILDREN_READ);

      Hashtable namedObjects = scene.getNamedObjects();
      System.out.println("*** Named Objects in VRML file: \n"
          + namedObjects);

      // recursively set the user data here
      // so we can find our objects when they are picked
      java.util.Enumeration enumValues = namedObjects.elements();
      java.util.Enumeration enumKeys = namedObjects.keys();

      if (enumValues != null) {
        while (enumValues.hasMoreElements() != false) {
          Object value = enumValues.nextElement();
          Object key = enumKeys.nextElement();

          recursiveSetUserData(value, key);
        }
      }
    }

    return sceneGroup;
  }

  // method to recursively set the user data for objects in the scenegraph
  // tree
  // we also set the capabilites on Shape3D and Morph objects required by the
  // PickTool
  void recursiveSetUserData(Object value, Object key) {
    if (value instanceof SceneGraphObject != false) {
      // set the user data for the item
      SceneGraphObject sg = (SceneGraphObject) value;
      sg.setUserData(key);

      // recursively process group
      if (sg instanceof Group) {
        Group g = (Group) sg;

        // recurse on child nodes
        java.util.Enumeration enumKids = g.getAllChildren();

        while (enumKids.hasMoreElements() != false)
          recursiveSetUserData(enumKids.nextElement(), key);
      } else if (sg instanceof Shape3D || sg instanceof Morph) {
        PickTool.setCapabilities((Node) sg, PickTool.INTERSECT_FULL);
      }
    }
  }

  // rewritten to check for user data
  public void mouseClicked(MouseEvent e) {
    System.out.println("*** MouseClick ***");

    pickCanvas.setShapeLocation(e);
    PickResult[] results = pickCanvas.pickAllSorted();

    if (results != null) {
      for (int n = 0; n < results.length; n++) {
        PickResult pickResult = results[n];

        System.out
            .println("Sorted PickResult " + n + ": " + pickResult);

        Node actualNode = pickResult.getObject();

        if (actualNode.getUserData() != null) {
          System.out.println("Sorted Object " + n + ": "
              + actualNode.getUserData());
        }
      }
    }

    PickResult pickResult = pickCanvas.pickClosest();

    if (pickResult != null) {
      System.out.println("Closest PickResult: " + pickResult);

      Node actualNode = pickResult.getObject();

      if (actualNode.getUserData() != null) {
        System.out.println("Closest Object: "        + actualNode.getUserData());
      }
    }

  }

  public void mouseEntered(MouseEvent e) {
  }

  public void mouseExited(MouseEvent e) {
  }

  public void mousePressed(MouseEvent e) {
  }

  public void mouseReleased(MouseEvent e) {
  }

  public static void main(String[] args) {
    System.out.println("Current user.dir: "
        + System.getProperty("user.dir"));

    VrmlPickingTest pickingTest = new VrmlPickingTest(args);

    new MainFrame(pickingTest, 400, 400);
  }
}

/*******************************************************************************
 * Copyright (C) 2001 Daniel Selman
 * 
 * First distributed with the book "Java 3D Programming" by Daniel Selman and
 * published by Manning Publications. http://manning.com/selman
 * 
 * This program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License as published by the Free Software
 * Foundation, version 2.
 * 
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
 * details.
 * 
 * The license can be found on the WWW at: http://www.fsf.org/copyleft/gpl.html
 * 
 * Or by writing to: Free Software Foundation, Inc., 59 Temple Place - Suite
 * 330, Boston, MA 02111-1307, USA.
 * 
 * Authors can be contacted at: Daniel Selman:  [e-mail] email address is being protected from spam bots, you need Javascript enabled to view it 
 * 
 * If you make changes you think others would like, please contact one of the
 * authors or someone at the www.j3d.org web site.
 ******************************************************************************/

//*****************************************************************************
/**
 * Java3dApplet
 * 
 * Base class for defining a Java 3D applet. Contains some useful methods for
 * defining views and scenegraphs etc.