Java3D-任意角度查看对象

关键词：Java3D对象,任意角度,查看
一个Java3D的鼠标拖动组件的特效，通过鼠标可以随意角度的查看3D对象。
运行效果如下图：

package com.zakisoft.hw;

/*
 *	@(#)ModelClipTest.java 1.10 02/10/21 13:45:01
 *
 * 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.applet.Applet;
import java.awt.BorderLayout;
import java.awt.GraphicsConfiguration;

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.Material;
import javax.media.j3d.ModelClip;
import javax.media.j3d.PolygonAttributes;
import javax.media.j3d.Transform3D;
import javax.media.j3d.TransformGroup;
import javax.vecmath.Color3f;
import javax.vecmath.Point3d;
import javax.vecmath.Vector3f;
import javax.vecmath.Vector4d;

import com.sun.j3d.utils.applet.MainFrame;
import com.sun.j3d.utils.behaviors.mouse.MouseRotate;
import com.sun.j3d.utils.behaviors.mouse.MouseZoom;
import com.sun.j3d.utils.geometry.Cylinder;
import com.sun.j3d.utils.universe.SimpleUniverse;

/**
 * ModelClipTest draws a cylinder and creates two clip planes to see the
 * interior of the cylinder.
 */
public class ModelClipTest extends Applet {

	private static final long serialVersionUID = 9087471750590410314L;
	private SimpleUniverse u = null;

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

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

		// 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);

		// This Transformgroup is used by the mouse manipulators to
		// move the CYlinder.
		TransformGroup objTrans = new TransformGroup();
		objTrans.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
		objTrans.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
		objScale.addChild(objTrans);

		// Create Model Clip
		ModelClip mc = new ModelClip();
		boolean enables[] = { false, false, false, false, false, false };
		Vector4d eqn1 = new Vector4d(0.0, 1.0, 0.0, 0.0);
		Vector4d eqn2 = new Vector4d(1.0, 1.0, 0.0, 0.0);
		mc.setEnables(enables);
		mc.setPlane(1, eqn1);
		mc.setPlane(2, eqn2);
		mc.setEnable(1, true);
		mc.setEnable(2, true);
		mc.setInfluencingBounds(bounds);
		objTrans.addChild(mc);

		// Create a cylinder
		PolygonAttributes attr = new PolygonAttributes();
		attr.setCullFace(PolygonAttributes.CULL_NONE);
		Appearance ap = new Appearance();
		Material mat = new Material();
		mat.setLightingEnable(true);
		ap.setMaterial(mat);
		ap.setPolygonAttributes(attr);

		Cylinder CylinderObj = new Cylinder(1.0f, 2.0f, ap);
		objTrans.addChild(CylinderObj);

		// Create the rotate behavior node
		MouseRotate behavior = new MouseRotate(objTrans);
		objTrans.addChild(behavior);
		behavior.setSchedulingBounds(bounds);

		// Create the zoom behavior node
		MouseZoom behavior2 = new MouseZoom(objTrans);
		objTrans.addChild(behavior2);
		behavior2.setSchedulingBounds(bounds);

		// Shine it with two colored lights.
		Color3f lColor1 = new Color3f(0.5f, 0.0f, 0.5f);
		Color3f lColor2 = new Color3f(0.7f, 0.7f, 0.0f);
		Vector3f lDir1 = new Vector3f(-1.0f, -1.0f, 1.0f);
		Vector3f lDir2 = new Vector3f(0.0f, 0.0f, -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 ModelClipTest() {
	}

	public void init() {
		setLayout(new BorderLayout());
		GraphicsConfiguration config = SimpleUniverse
				.getPreferredConfiguration();

		Canvas3D c = new Canvas3D(config);
		add("Center", c);

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

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

		u.addBranchGraph(scene);
	}

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

	public static void main(String argv[]) {

		new MainFrame(new ModelClipTest(), 500, 500);
	}
}

文章地址：http://javapub.iteye.com/blog/760468