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/Users/lyon/j4p/src/j3d/DistanceLODApp.java
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1 package j3d;
2
3 /*
4 * @(#)DistanceLODApp.java 1.1 00/09/22 14:37
5 *
6 * Copyright (c) 1996-2000 Sun Microsystems, Inc. All Rights Reserved.
7 *
8 * Sun grants you ("Licensee") a non-exclusive, royalty free, license to use,
9 * modify and redistribute this software in source and binary code form,
10 * provided that i) this copyright notice and license appear on all copies of
11 * the software; and ii) Licensee does not utilize the software in a manner
12 * which is disparaging to Sun.
13 *
14 * This software is provided "AS IS," without a warranty of any kind. ALL
15 * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING ANY
16 * IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR
17 * NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN AND ITS LICENSORS SHALL NOT BE
18 * LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING
19 * OR DISTRIBUTING THE SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR ITS
20 * LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT,
21 * INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER
22 * CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF
23 * OR INABILITY TO USE SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
24 * POSSIBILITY OF SUCH DAMAGES.
25 *
26 * This software is not designed or intended for use in on-line control of
27 * aircraft, air traffic, aircraft navigation or aircraft communications; or in
28 * the design, construction, operation or maintenance of any nuclear
29 * facility. Licensee represents and warrants that it will not use or
30 * redistribute the Software for such purposes.
31 */
32
33 import com.sun.j3d.utils.applet.MainFrame;
34 import com.sun.j3d.utils.geometry.Sphere;
35 import com.sun.j3d.utils.universe.SimpleUniverse;
36
37 import javax.media.j3d.*;
38 import javax.vecmath.AxisAngle4f;
39 import javax.vecmath.Point3f;
40 import javax.vecmath.Vector3f;
41 import java.applet.Applet;
42 import java.awt.*;
43
44 // DistanceLODApp renders a simple landscape
45
46 public class DistanceLODApp extends Applet {
47
48
49 public BranchGroup createSceneGraph() {
50 BranchGroup objRoot = new BranchGroup();
51 BoundingSphere bounds = new BoundingSphere();
52
53 // create target TransformGroup with Capabilities
54 TransformGroup objMove = new TransformGroup();
55 objMove.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
56
57 // create Alpha
58 Alpha alpha = new Alpha(-1,
59 Alpha.INCREASING_ENABLE + Alpha.DECREASING_ENABLE,
60 0, 0, 5000, 1000, 1000, 5000, 1000, 1000);
61
62 // specify the axis of translation
63 AxisAngle4f axisOfTra = new AxisAngle4f(0.0f, 1.0f, 0.0f, (float) Math.PI / -2.0f);
64 Transform3D axisT3D = new Transform3D();
65 axisT3D.set(axisOfTra);
66
67 // create position interpolator
68 PositionInterpolator posInt
69 = new PositionInterpolator(alpha, objMove, axisT3D, 0.0f, -35.0f);
70 posInt.setSchedulingBounds(bounds);
71
72 // create DistanceLOD target object
73 Switch targetSwitch = new Switch();
74 targetSwitch.setCapability(Switch.ALLOW_SWITCH_WRITE);
75
76 // add visual objects of various levels of detail to the target switch
77 Appearance sphereAppearA = new Appearance();
78 ColoringAttributes sphereCAa = new ColoringAttributes();
79 sphereCAa.setColor(0.1f, 0.8f, 0.1f);
80 sphereAppearA.setColoringAttributes(sphereCAa);
81
82 Appearance sphereAppearB = new Appearance();
83 ColoringAttributes sphereCAb = new ColoringAttributes();
84 sphereCAb.setColor(0.8f, 0.1f, 0.1f);
85 sphereAppearB.setColoringAttributes(sphereCAb);
86
87 targetSwitch.addChild(new Sphere(.40f, 0, 25, sphereAppearA));
88 targetSwitch.addChild(new Sphere(.40f, 0, 15, sphereAppearB));
89 targetSwitch.addChild(new Sphere(.40f, 0, 10, sphereAppearA));
90 targetSwitch.addChild(new Sphere(.40f, 0, 4, sphereAppearB));
91
92 // create DistanceLOD object
93 float[] distances = {5.0f, 10.0f, 20.0f};
94 DistanceLOD dLOD = new DistanceLOD(distances, new Point3f());
95 dLOD.addSwitch(targetSwitch);
96 dLOD.setSchedulingBounds(bounds);
97
98 if ((targetSwitch.numChildren() - 1) != dLOD.numDistances()) {
99 System.out.println("DistanceLOD not initialized properly");
100 System.out.println(targetSwitch.numChildren());
101 System.out.println(dLOD.numDistances());
102 }
103
104 // assemble scene graph
105
106 objRoot.addChild(objMove); // target TG of position interp to move vo
107 objRoot.addChild(posInt); // add position interpolator
108 objMove.addChild(dLOD); // make the bounds move with visual object
109 objMove.addChild(targetSwitch);// must add target switch to scene graph too
110
111
112 // show a level 3 object up close for comparison
113 Transform3D t3d = new Transform3D();
114 t3d.set(new Vector3f(0.6f, 0.0f, 0.0f));
115 TransformGroup tga = new TransformGroup(t3d);
116 objRoot.addChild(tga);
117 tga.addChild(new Sphere(.40f, 0, 4, sphereAppearB));
118
119 // show a level 0 object at a distance for comparison
120 t3d.set(new Vector3f(-5.0f, 0.0f, -35.0f));
121 TransformGroup tgb = new TransformGroup(t3d);
122 objRoot.addChild(tgb);
123 tgb.addChild(new Sphere(.40f, 0, 25, sphereAppearA));
124
125 // a white background is better for printing images in tutorial
126 Background background = new Background();
127 background.setColor(1.0f, 1.0f, 1.0f);
128 background.setApplicationBounds(new BoundingSphere());
129 objRoot.addChild(background);
130
131 // Let Java 3D perform optimizations on this scene graph.
132 objRoot.compile();
133
134 return objRoot;
135 } // end of CreateSceneGraph method of DistanceLODApp
136
137 public DistanceLODApp() {
138 setLayout(new BorderLayout());
139 GraphicsConfiguration config =
140 SimpleUniverse.getPreferredConfiguration();
141
142 Canvas3D canvas3D = new Canvas3D(config);
143 add("Center", canvas3D);
144
145 BranchGroup scene = createSceneGraph();
146
147 // SimpleUniverse is a Convenience Utility class
148 SimpleUniverse simpleU = new SimpleUniverse(canvas3D);
149
150 // This will move the ViewPlatform back a bit so the
151 // objects in the scene can be viewed.
152 simpleU.getViewingPlatform().setNominalViewingTransform();
153
154 simpleU.addBranchGraph(scene);
155 } // end of DistanceLODApp (constructor)
156
157
158 // The following allows this to be run as an application
159 // as well as an applet
160
161 public static void main(String[] args) {
162 System.out.print("DistanceLODApp.java\n- a demonstration of using the DistanceLOD ");
163 System.out.println("class to provide variable \n level of detail (LOD) for a visual object in a Java 3D scene.");
164 System.out.println("The sphere is represented by one of four different spheres \ndepending on the viewing distance.");
165 System.out.println("In this example the different spheres are colored differently to \nillustrate swithcing.");
166 System.out.println("In practice the spheres would all be colored alike.");
167 System.out.println("The large static sphere is a duplicate of the sphere with the least detail.");
168 System.out.println("The small static sphere is a duplicate of the sphere with the most detail.\n");
169 System.out.println("This is an example progam from The Java 3D API Tutorial.");
170 System.out.println("The Java 3D Tutorial is available on the web at:");
171 System.out.println("http://java.sun.com/products/java-media/3D/collateral");
172 Frame frame = new MainFrame(new DistanceLODApp(), 256, 256);
173 } // end of main (method of DistanceLODApp)
174
175 } // end of class DistanceLODApp
176