Java3D-加载显示3D模型

关键词：Java3D,3D模型文件,加载显示
利用Java3D查看一个3D模型文件(如附件)，模型文件可以展示一个3D的图案。运行程序后，可以任意角度的查看该文件。
运行效果如下：
[img]http://www.kutoku.info/images/java/100910/3d03.png[/img]
[img]http://www.kutoku.info/images/java/100910/3d04.png[/img]

源码如下：

package com.zakisoft.hw;

/*
 *	@(#)ConfigObjLoad.java 1.3 02/04/01 15:04:14
 *
 * Copyright (c) 1996-2002 Sun Microsystems, Inc. All Rights Reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * - Redistribution in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in
 *   the documentation and/or other materials provided with the
 *   distribution.
 *
 * Neither the name of Sun Microsystems, Inc. or the names of
 * contributors may be used to endorse or promote products derived
 * from this software without specific prior written permission.
 *
 * This software is provided "AS IS," without a warranty of any
 * kind. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
 * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY
 * EXCLUDED. SUN AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES
 * SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
 * DISTRIBUTING THE SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN
 * OR ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR
 * FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR
 * PUNITIVE DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF
 * LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE SOFTWARE,
 * EVEN IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
 *
 * You acknowledge that Software is not designed,licensed or intended
 * for use in the design, construction, operation or maintenance of
 * any nuclear facility.
 */

import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.io.FileNotFoundException;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Map;

import javax.media.j3d.Alpha;
import javax.media.j3d.AmbientLight;
import javax.media.j3d.Background;
import javax.media.j3d.BoundingSphere;
import javax.media.j3d.BranchGroup;
import javax.media.j3d.Canvas3D;
import javax.media.j3d.DirectionalLight;
import javax.media.j3d.RotationInterpolator;
import javax.media.j3d.Sensor;
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.loaders.IncorrectFormatException;
import com.sun.j3d.loaders.ParsingErrorException;
import com.sun.j3d.loaders.Scene;
import com.sun.j3d.loaders.objectfile.ObjectFile;
import com.sun.j3d.utils.behaviors.sensor.Mouse6DPointerBehavior;
import com.sun.j3d.utils.behaviors.vp.OrbitBehavior;
import com.sun.j3d.utils.universe.ConfiguredUniverse;
import com.sun.j3d.utils.universe.ViewingPlatform;

public class ConfigObjLoad {

	private boolean spin = false;
	private boolean noTriangulate = false;
	private boolean noStripify = false;
	private double creaseAngle = 60.0;
	private URL filename = null;

	private ConfiguredUniverse u;

	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(0.7);
		objScale.setTransform(t3d);
		objRoot.addChild(objScale);

		// 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);
		objTrans.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
		objScale.addChild(objTrans);

		int flags = ObjectFile.RESIZE;
		if (!noTriangulate)
			flags |= ObjectFile.TRIANGULATE;
		if (!noStripify)
			flags |= ObjectFile.STRIPIFY;
		ObjectFile f = new ObjectFile(flags,
				(float) (creaseAngle * Math.PI / 180.0));
		Scene s = null;
		try {
			s = f.load(filename);
		} 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);
		}

		objTrans.addChild(s.getSceneGroup());

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

		if (spin) {
			Transform3D yAxis = new Transform3D();
			Alpha rotationAlpha = new Alpha(-1, Alpha.INCREASING_ENABLE, 0, 0,
					4000, 0, 0, 0, 0, 0);

			RotationInterpolator rotator = new RotationInterpolator(
					rotationAlpha, objTrans, yAxis, 0.0f,
					(float) Math.PI * 2.0f);
			rotator.setSchedulingBounds(bounds);
			objTrans.addChild(rotator);
		}

		// Set up the background
		Color3f bgColor = new Color3f(0.05f, 0.05f, 0.5f);
		Background bgNode = new Background(bgColor);
		bgNode.setApplicationBounds(bounds);
		objRoot.addChild(bgNode);

		// Set up the ambient light
		Color3f ambientColor = new Color3f(0.1f, 0.1f, 0.1f);
		AmbientLight ambientLightNode = new AmbientLight(ambientColor);
		ambientLightNode.setInfluencingBounds(bounds);
		objRoot.addChild(ambientLightNode);

		// Set up the directional lights
		Color3f light1Color = new Color3f(1.0f, 1.0f, 0.9f);
		Vector3f light1Direction = new Vector3f(1.0f, 1.0f, 1.0f);
		Color3f light2Color = new Color3f(1.0f, 1.0f, 1.0f);
		Vector3f light2Direction = new Vector3f(-1.0f, -1.0f, -1.0f);

		DirectionalLight light1 = new DirectionalLight(light1Color,
				light1Direction);
		light1.setInfluencingBounds(bounds);
		objRoot.addChild(light1);

		DirectionalLight light2 = new DirectionalLight(light2Color,
				light2Direction);
		light2.setInfluencingBounds(bounds);
		objRoot.addChild(light2);

		return objRoot;
	}

	private void usage() {
		System.out
				.println("Usage: java ObjLoad [-s] [-n] [-t] [-c degrees] <.obj file>");
		System.out.println("  -s Spin (no user interaction)");
		System.out.println("  -n No triangulation");
		System.out.println("  -t No stripification");
		System.out
				.println("  -c Set crease angle for normal generation (default is 60 without");
		System.out
				.println("     smoothing group info, otherwise 180 within smoothing groups)");
		System.exit(0);
	} // End of usage

	public void init() {
		if (filename == null) {
			try {
				filename = new URL("file:./geometry/galleon.obj");
			} catch (MalformedURLException e) {
				System.err.println(e);
				System.exit(1);
			}
		}

		// Get the config file URL from the j3d.configURL property or use the
		// default config file "j3d1x1-window" in the current directory.
		URL configURL = ConfiguredUniverse
				.getConfigURL("file:./files/j3d1x1-window");

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

		// Get the ViewingPlatform.
		ViewingPlatform viewingPlatform = u.getViewingPlatform();

		// This will move the ViewPlatform back a bit so the objects in the
		// scene can be viewed. This will only have an effect if the config
		// file sets the window eyepoint policy to something other than
		// RELATIVE_TO_COEXISTENCE, which is the default eyepoint policy
		// applied by ConfiguredUniverse.
		// 
		// The default view attach policy for ConfiguredUniverse applications
		// is NOMINAL_SCREEN. This sets the view platform origin in the
		// physical world to the center of coexistence, which allows eye
		// positions expressed relative to coexistence to see the appropriate
		// field of view automatically.
		viewingPlatform.setNominalViewingTransform();

		// Add a ViewPlatformBehavior if not specified in the config file.
		if (!spin && viewingPlatform.getViewPlatformBehavior() == null) {
			OrbitBehavior orbit = new OrbitBehavior(u.getCanvas(),
					OrbitBehavior.REVERSE_ALL);
			BoundingSphere bounds = new BoundingSphere(new Point3d(0.0, 0.0,
					0.0), 100.0);

			orbit.setSchedulingBounds(bounds);
			viewingPlatform.setViewPlatformBehavior(orbit);
		}

		// See if there's a 6 degree of freedom mouse in the environment.
		// We look for one named "mouse6d".
		Map sensorMap = null;
		sensorMap = u.getNamedSensors();
		if (sensorMap != null) {
			Sensor mouse6d = (Sensor) sensorMap.get("mouse6d");
			if (mouse6d != null) {
				Mouse6DPointerBehavior behavior = new Mouse6DPointerBehavior(
						mouse6d, 1.0, true);

				BoundingSphere bounds = new BoundingSphere(new Point3d(0.0,
						0.0, 0.0), 100.0);
				behavior.setSchedulingBounds(bounds);

				scene.addChild(behavior);
				scene.addChild(behavior.getEcho());
			}
		}

		// Listen for a typed "q", "Q", or "Escape" key on each canvas to
		// allow a convenient exit from full screen configurations.
		Canvas3D[] canvases;
		canvases = u.getViewer().getCanvas3Ds();

		class QuitListener extends KeyAdapter {
			public void keyTyped(KeyEvent e) {
				char c = e.getKeyChar();
				if (c == 'q' || c == 'Q' || c == 27)
					System.exit(0);
			}
		}

		QuitListener quitListener = new QuitListener();
		for (int i = 0; i < canvases.length; i++)
			canvases[i].addKeyListener(quitListener);

		// Make the scenegraph live.
		u.addBranchGraph(scene);
	}

	public ConfigObjLoad(String[] args) {
		if (args.length != 0) {
			for (int i = 0; i < args.length; i++) {
				if (args[i].startsWith("-")) {
					if (args[i].equals("-s")) {
						spin = true;
					} else if (args[i].equals("-n")) {
						noTriangulate = true;
					} else if (args[i].equals("-t")) {
						noStripify = true;
					} else if (args[i].equals("-c")) {
						if (i < args.length - 1) {
							creaseAngle = (new Double(args[++i])).doubleValue();
						} else
							usage();
					} else {
						usage();
					}
				} else {
					try {
						if ((args[i].indexOf("file:") == 0)
								|| (args[i].indexOf("http") == 0)) {
							filename = new URL(args[i]);
						} else if (args[i].charAt(0) != '/') {
							filename = new URL("file:./" + args[i]);
						} else {
							filename = new URL("file:" + args[i]);
						}
					} catch (MalformedURLException e) {
						System.err.println(e);
						System.exit(1);
					}
				}
			}
		}
		init();
	}

	public static void main(String[] args) {
		new ConfigObjLoad(args);
	}
}