Java tutorial
/* * @(#)LOD.java 1.13 02/10/21 13:44:04 * * 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.AmbientLight; import javax.media.j3d.BoundingSphere; import javax.media.j3d.BranchGroup; import javax.media.j3d.Canvas3D; import javax.media.j3d.DirectionalLight; import javax.media.j3d.DistanceLOD; //import javax.media.j3d.LOD; import javax.media.j3d.Switch; import javax.media.j3d.TransformGroup; import javax.vecmath.Color3f; import javax.vecmath.Point3d; import javax.vecmath.Vector3f; import com.sun.j3d.utils.applet.MainFrame; import com.sun.j3d.utils.behaviors.vp.OrbitBehavior; import com.sun.j3d.utils.geometry.Sphere; import com.sun.j3d.utils.universe.SimpleUniverse; import com.sun.j3d.utils.universe.ViewingPlatform; public class LOD extends Applet { private SimpleUniverse u = null; public BranchGroup createSceneGraph() { // Create the root of the branch graph BranchGroup objRoot = new BranchGroup(); createLights(objRoot); // 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); objRoot.addChild(objTrans); // Create a switch to hold the different levels of detail Switch sw = new Switch(0); sw.setCapability(javax.media.j3d.Switch.ALLOW_SWITCH_READ); sw.setCapability(javax.media.j3d.Switch.ALLOW_SWITCH_WRITE); // Create several levels for the switch, with less detailed // spheres for the ones which will be used when the sphere is // further away sw.addChild(new Sphere(0.4f, Sphere.GENERATE_NORMALS, 40)); sw.addChild(new Sphere(0.4f, Sphere.GENERATE_NORMALS, 20)); sw.addChild(new Sphere(0.4f, Sphere.GENERATE_NORMALS, 10)); sw.addChild(new Sphere(0.4f, Sphere.GENERATE_NORMALS, 3)); // Add the switch to the main group objTrans.addChild(sw); BoundingSphere bounds = new BoundingSphere(new Point3d(0.0, 0.0, 0.0), 100.0); // set up the DistanceLOD behavior float[] distances = new float[3]; distances[0] = 5.0f; distances[1] = 10.0f; distances[2] = 25.0f; DistanceLOD lod = new DistanceLOD(distances); lod.addSwitch(sw); lod.setSchedulingBounds(bounds); objTrans.addChild(lod); // Have Java 3D perform optimizations on this scene graph. objRoot.compile(); return objRoot; } private void createLights(BranchGroup graphRoot) { // Create a bounds for the light source influence BoundingSphere bounds = new BoundingSphere(new Point3d(0.0, 0.0, 0.0), 100.0); // Set up the global, ambient light Color3f alColor = new Color3f(0.2f, 0.2f, 0.2f); AmbientLight aLgt = new AmbientLight(alColor); aLgt.setInfluencingBounds(bounds); graphRoot.addChild(aLgt); // Set up the directional (infinite) light source Color3f lColor1 = new Color3f(0.9f, 0.9f, 0.9f); Vector3f lDir1 = new Vector3f(1.0f, 1.0f, -1.0f); DirectionalLight lgt1 = new DirectionalLight(lColor1, lDir1); lgt1.setInfluencingBounds(bounds); graphRoot.addChild(lgt1); } public LOD() { } 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); // only add zoom mouse behavior to viewingPlatform ViewingPlatform viewingPlatform = u.getViewingPlatform(); // This will move the ViewPlatform back a bit so the // objects in the scene can be viewed. viewingPlatform.setNominalViewingTransform(); // add orbit behavior to the ViewingPlatform, but disable rotate // and translate OrbitBehavior orbit = new OrbitBehavior(c, OrbitBehavior.REVERSE_ZOOM | OrbitBehavior.DISABLE_ROTATE | OrbitBehavior.DISABLE_TRANSLATE); BoundingSphere bounds = new BoundingSphere(new Point3d(0.0, 0.0, 0.0), 100.0); orbit.setSchedulingBounds(bounds); viewingPlatform.setViewPlatformBehavior(orbit); u.addBranchGraph(scene); } public void destroy() { u.cleanup(); } // // The following allows LOD to be run as an application // as well as an applet // public static void main(String[] args) { new MainFrame(new LOD(), 512, 512); } }