Mega Code Archive
Creating a geometric background in a Java 3D
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/*
* @(#)BackgroundApp.java 1.1 00/09/22 14:03
*
* Copyright (c) 1996-2000 Sun Microsystems, Inc. All Rights Reserved.
*
* Sun grants you ("Licensee") a non-exclusive, royalty free, license to use,
* modify and redistribute this software in source and binary code form,
* provided that i) this copyright notice and license appear on all copies of
* the software; and ii) Licensee does not utilize the software in a manner
* which is disparaging to Sun.
*
* 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
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* Licensee represents and warrants that it will not use or redistribute the
* Software for such purposes.
*/
import java.applet.Applet;
import java.awt.BorderLayout;
import java.awt.Frame;
import java.awt.Window;
import java.awt.event.*;
import java.awt.GraphicsConfiguration;
import com.sun.j3d.utils.applet.MainFrame;
import com.sun.j3d.utils.universe.*;
import com.sun.j3d.utils.geometry.*;
import javax.media.j3d.*;
import javax.vecmath.*;
import java.awt.event.*;
import java.awt.AWTEvent;
import java.util.Enumeration;
import com.sun.j3d.utils.behaviors.keyboard.*;
/*
* BackgroundApp is an example of creating a geometric background in a Java 3D
* program.
*
* This program creates a geometric background of stars and one constellation.
* Also created in the scene is a grid of green lines. These represent a
* horizontal surface (the ground) in in the local area. It is provided for a
* reference for movement in the scene.
*
* The viewer can move in this virtual world using the arrow keys. The movement
* is provided by the KeyNavigator class.
*
* This example also uses a BoundingLeaf object for the application bounds for
* the KeyNavigatorBehavior class. There is a bug kludge in this code. See below
* for more details.
*
* This program was created as a companion to the Java 3D API tutorial available
* from the Java 3D API homepage.
*
* Background and BoundingLeaf classes are documented in Chapter 3. Interaction,
* in general, and KeyNavigator class, specifically, are documented in Chapter
* 4.
*
* The first 200 lines (or so) of code simply create the geometry for the
* background and the rest of the view.
*
* There is no guarantee that any of the stars nor the constellation is an
* accurate representation of the the view from earth.
*/
public class BackgroundApp extends Applet {
Shape3D createLand() {
LineArray landGeom = new LineArray(44, GeometryArray.COORDINATES
| GeometryArray.COLOR_3);
float l = -50.0f;
for (int c = 0; c < 44; c += 4) {
landGeom.setCoordinate(c + 0, new Point3f(-50.0f, 0.0f, l));
landGeom.setCoordinate(c + 1, new Point3f(50.0f, 0.0f, l));
landGeom.setCoordinate(c + 2, new Point3f(l, 0.0f, -50.0f));
landGeom.setCoordinate(c + 3, new Point3f(l, 0.0f, 50.0f));
l += 10.0f;
}
Color3f c = new Color3f(0.1f, 0.8f, 0.1f);
for (int i = 0; i < 44; i++)
landGeom.setColor(i, c);
return new Shape3D(landGeom);
}
public BranchGroup createSceneGraph(SimpleUniverse su) {
// Create the root of the branch graph
BranchGroup objRootBG = new BranchGroup();
Vector3f translate = new Vector3f();
Transform3D T3D = new Transform3D();
translate.set(0.0f, -0.3f, 0.0f);
T3D.setTranslation(translate);
TransformGroup objRoot = new TransformGroup(T3D);
objRootBG.addChild(objRoot);
objRoot.addChild(createLand());
BoundingLeaf boundingLeaf = new BoundingLeaf(new BoundingSphere());
PlatformGeometry platformGeom = new PlatformGeometry();
platformGeom.addChild(boundingLeaf);
platformGeom.compile();
su.getViewingPlatform().setPlatformGeometry(platformGeom);
KeyNavigatorBehavior keyNavBeh = new KeyNavigatorBehavior(su
.getViewingPlatform().getViewPlatformTransform());
keyNavBeh.setSchedulingBoundingLeaf(boundingLeaf);
objRootBG.addChild(keyNavBeh);
Background background = new Background();
background.setApplicationBounds(new BoundingSphere(new Point3d(),
1000.0));
background.setGeometry(createBackGraph());
objRoot.addChild(background);
AmbientLight ambientLight = new AmbientLight();
ambientLight.setInfluencingBounds(new BoundingSphere());
objRootBG.addChild(ambientLight);
return objRootBG;
} // end of CreateSceneGraph method
/////////////////////////////////////////////////////////
public BranchGroup createBackGraph() {
// Create the root of the branch graph
BranchGroup objRoot = new BranchGroup();
PointArray starGeom1 = new PointArray(7, PointArray.COORDINATES);
Appearance starAppear1 = new Appearance();
starGeom1.setCoordinate(0, new Point3f(0.79483311f, -0.58810995f,
0.14955615f));
starGeom1.setCoordinate(1, new Point3f(0.44430932f, -0.55736839f,
-0.70137505f));
starGeom1.setCoordinate(2, new Point3f(0.94901367f, -0.30404968f,
0.08322775f));
starGeom1.setCoordinate(3, new Point3f(0.68060123f, -0.43044807f,
0.59287173f));
starGeom1.setCoordinate(4, new Point3f(-0.11641672f, 0.47273532f,
0.87348049f));
starGeom1.setCoordinate(5, new Point3f(-0.10399289f, -0.98059412f,
0.16619437f));
starGeom1.setCoordinate(6, new Point3f(0.08024400f, -0.96944100f,
-0.23182900f));
PointAttributes point1 = new PointAttributes(4.0f, false);
starAppear1.setPointAttributes(point1);
objRoot.addChild(new Shape3D(starGeom1, starAppear1));
PointArray starGeom2 = new PointArray(18, PointArray.COORDINATES);
starGeom2.setCoordinate(0,
new Point3f(0.050844f, -0.992329f, 0.112678f));
starGeom2.setCoordinate(1, new Point3f(-0.063091f, -0.997672f,
0.025869f));
starGeom2.setCoordinate(2,
new Point3f(0.096706f, -0.980384f, 0.171736f));
starGeom2.setCoordinate(3,
new Point3f(-0.562384f, 0.073568f, 0.823595f));
starGeom2.setCoordinate(4,
new Point3f(-0.863904f, 0.059045f, 0.500180f));
starGeom2.setCoordinate(5,
new Point3f(-0.727033f, 0.304149f, 0.615559f));
starGeom2.setCoordinate(6,
new Point3f(-0.724850f, 0.535590f, 0.433281f));
starGeom2.setCoordinate(7, new Point3f(0.185904f, -0.976907f,
-0.105311f));
starGeom2.setCoordinate(8, new Point3f(0.738028f, -0.531886f,
-0.415221f));
starGeom2.setCoordinate(9, new Point3f(-0.402152f, 0.392690f,
-0.827085f));
starGeom2.setCoordinate(10, new Point3f(-0.020020f, -0.999468f,
-0.025724f));
starGeom2.setCoordinate(11, new Point3f(-0.384103f, -0.887075f,
0.256050f));
starGeom2.setCoordinate(12, new Point3f(-0.224464f, -0.968946f,
-0.103720f));
starGeom2.setCoordinate(13, new Point3f(-0.828880f, -0.397932f,
-0.393203f));
starGeom2.setCoordinate(14, new Point3f(-0.010557f, -0.998653f,
0.050797f));
starGeom2.setCoordinate(15, new Point3f(-0.282122f, 0.258380f,
-0.923930f));
starGeom2.setCoordinate(16, new Point3f(-0.941342f, -0.030364f,
0.336082f));
starGeom2
.setCoordinate(17, new Point3f(0.00057f, -0.99651f, -0.08344f));
Appearance starAppear2 = new Appearance();
PointAttributes point2 = new PointAttributes(2.0f, false);
starAppear2.setPointAttributes(point2);
objRoot.addChild(new Shape3D(starGeom2, starAppear2));
PointArray starGeom3 = new PointArray(20, PointArray.COORDINATES);
starGeom3.setCoordinate(0, new Point3f(0.07292f, -0.98862f, -0.13153f));
starGeom3.setCoordinate(1, new Point3f(0.23133f, -0.87605f, -0.42309f));
starGeom3.setCoordinate(2, new Point3f(-0.08215f, -0.64657f, 0.75840f));
starGeom3.setCoordinate(3, new Point3f(-0.84545f, 0.53398f, 0.00691f));
starGeom3
.setCoordinate(4, new Point3f(-0.49365f, -0.83645f, -0.23795f));
starGeom3.setCoordinate(5, new Point3f(0.06883f, -0.99319f, -0.09396f));
starGeom3.setCoordinate(6, new Point3f(0.87582f, -0.40662f, 0.25997f));
starGeom3.setCoordinate(7, new Point3f(-0.09095f, -0.99555f, 0.02467f));
starGeom3.setCoordinate(8, new Point3f(0.45306f, -0.81575f, -0.35955f));
starGeom3.setCoordinate(9, new Point3f(0.17669f, -0.97939f, 0.09776f));
starGeom3.setCoordinate(10, new Point3f(0.27421f, -0.83963f, 0.46884f));
starGeom3
.setCoordinate(11, new Point3f(0.32703f, -0.94013f, -0.09584f));
starGeom3.setCoordinate(12,
new Point3f(-0.01615f, -0.99798f, -0.06132f));
starGeom3
.setCoordinate(13, new Point3f(-0.76665f, 0.45998f, -0.44791f));
starGeom3
.setCoordinate(14, new Point3f(-0.91025f, -0.07102f, 0.40791f));
starGeom3.setCoordinate(15,
new Point3f(-0.00240f, -0.97104f, -0.23887f));
starGeom3.setCoordinate(16, new Point3f(0.91936f, -0.39244f, 0.02740f));
starGeom3.setCoordinate(17, new Point3f(0.18290f, -0.97993f, 0.07920f));
starGeom3.setCoordinate(18, new Point3f(-0.48755f, 0.61592f, 0.61884f));
starGeom3
.setCoordinate(19, new Point3f(-0.89375f, 0.36087f, -0.26626f));
objRoot.addChild(new Shape3D(starGeom3));
int[] stripCount = { 10 };
LineStripArray orion = new LineStripArray(10,
LineStripArray.COORDINATES, stripCount);
orion.setCoordinate(0, new Point3f(0.978330f, -0.033900f, 0.204426f));
orion.setCoordinate(1, new Point3f(0.968007f, -0.167860f, 0.186506f));
orion.setCoordinate(2, new Point3f(0.981477f, -0.142660f, 0.127873f));
orion.setCoordinate(3, new Point3f(0.983764f, -0.005220f, 0.179391f));
orion.setCoordinate(4, new Point3f(0.981112f, 0.110597f, 0.158705f));
orion.setCoordinate(5, new Point3f(0.967377f, 0.172516f, 0.185523f));
orion.setCoordinate(6, new Point3f(0.961385f, 0.128845f, 0.243183f));
orion.setCoordinate(7, new Point3f(0.978330f, -0.033900f, 0.204426f));
orion.setCoordinate(8, new Point3f(0.981293f, -0.020980f, 0.191375f));
orion.setCoordinate(9, new Point3f(0.983764f, -0.005220f, 0.179391f));
objRoot.addChild(new Shape3D(orion));
objRoot.compile();
return objRoot;
} // end of CreateBackGraph method
/////////////////////BackgroundApp//////////////////////
public BackgroundApp() {
setLayout(new BorderLayout());
GraphicsConfiguration config = SimpleUniverse
.getPreferredConfiguration();
Canvas3D canvas3D = new Canvas3D(config);
canvas3D.setStereoEnable(false);
add("Center", canvas3D);
// SimpleUniverse is a Convenience Utility class
SimpleUniverse simpleU = new SimpleUniverse(canvas3D);
BranchGroup scene = createSceneGraph(simpleU);
// This will move the ViewPlatform back a bit so the
// objects in the scene can be viewed.
simpleU.getViewingPlatform().setNominalViewingTransform();
simpleU.addBranchGraph(scene);
new OtherView(simpleU.getLocale()); /* see note below */
} // end of BackgroundApp (constructor)
/*
* This class was created to make the boundingleaf work for this example
* program. One OtherView object is created just a couple of lines above.
* Inserting a second frame in the scene makes the BoundingLeaf object work
* as desired.
*/
public class OtherView extends Object {
public TransformGroup vpTrans;
public OtherView(Locale locale) {
GraphicsConfiguration config = SimpleUniverse
.getPreferredConfiguration();
Canvas3D canvas3D = new Canvas3D(config);
canvas3D.setStereoEnable(false);
PhysicalBody body = new PhysicalBody();
PhysicalEnvironment environment = new PhysicalEnvironment();
View view = new View();
view.setPhysicalBody(body);
view.setPhysicalEnvironment(environment);
BranchGroup vpRoot = new BranchGroup();
Transform3D viewT3D = new Transform3D();
viewT3D.set(new Vector3f(0.0f, 0.0f, 2.0f));
ViewPlatform vp = new ViewPlatform();
vpTrans = new TransformGroup(viewT3D);
vpTrans.addChild(vp);
vpRoot.addChild(vpTrans);
view.attachViewPlatform(vp);
locale.addBranchGraph(vpRoot);
}
} // end of OtherView class
// The following allows this to be run as an application
// as well as an applet
public static void main(String[] args) {
System.out
.println("BackgroundApp.java - a demonstration of placing geometry");
System.out.println("in the background of a Java 3D scene.");
System.out
.println("When the app loads, you can use the arrow keys to move.");
System.out.println("The Java 3D Tutorial is available on the web at:");
System.out
.println("http://java.sun.com/products/java-media/3D/collateral");
Frame frame = new MainFrame(new BackgroundApp(), 256, 256);
} // end of main (method of BackgroundApp)
} // end of class BackgroundApp
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