Sphere Motion
/*
* @(#)SphereMotion.java 1.38 02/10/21 13:55:06
*
* Copyright (c) 1996-2002 Sun Microsystems, Inc. All Rights Reserved.
*
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* modification, are permitted provided that the following conditions are met:
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* this list of conditions and the following disclaimer.
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* this list of conditions and the following disclaimer in the documentation
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*
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* 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
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* IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR
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*/
import java.applet.Applet;
import java.awt.BorderLayout;
import java.awt.GraphicsConfiguration;
import javax.media.j3d.Alpha;
import javax.media.j3d.AmbientLight;
import javax.media.j3d.Appearance;
import javax.media.j3d.Background;
import javax.media.j3d.BoundingSphere;
import javax.media.j3d.BranchGroup;
import javax.media.j3d.Canvas3D;
import javax.media.j3d.ColoringAttributes;
import javax.media.j3d.DirectionalLight;
import javax.media.j3d.Light;
import javax.media.j3d.Material;
import javax.media.j3d.PointLight;
import javax.media.j3d.PositionInterpolator;
import javax.media.j3d.RotationInterpolator;
import javax.media.j3d.SpotLight;
import javax.media.j3d.Transform3D;
import javax.media.j3d.TransformGroup;
import javax.vecmath.Color3f;
import javax.vecmath.Point3d;
import javax.vecmath.Point3f;
import javax.vecmath.Vector3d;
import javax.vecmath.Vector3f;
import com.sun.j3d.utils.applet.MainFrame;
import com.sun.j3d.utils.geometry.Sphere;
import com.sun.j3d.utils.universe.SimpleUniverse;
public class SphereMotion extends Applet {
// Constants for type of light to use
private static final int DIRECTIONAL_LIGHT = 0;
private static final int POINT_LIGHT = 1;
private static final int SPOT_LIGHT = 2;
// Flag indicates type of lights: directional, point, or spot
// lights. This flag is set based on command line argument
private static int lightType = POINT_LIGHT;
private SimpleUniverse u = null;
public BranchGroup createSceneGraph(SimpleUniverse u) {
Color3f eColor = new Color3f(0.0f, 0.0f, 0.0f);
Color3f sColor = new Color3f(1.0f, 1.0f, 1.0f);
Color3f objColor = new Color3f(0.6f, 0.6f, 0.6f);
Color3f lColor1 = new Color3f(1.0f, 0.0f, 0.0f);
Color3f lColor2 = new Color3f(0.0f, 1.0f, 0.0f);
Color3f alColor = new Color3f(0.2f, 0.2f, 0.2f);
Color3f bgColor = new Color3f(0.05f, 0.05f, 0.2f);
Transform3D t;
// 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(0.4);
objScale.setTransform(t3d);
objRoot.addChild(objScale);
// Create a bounds for the background and lights
BoundingSphere bounds = new BoundingSphere(new Point3d(0.0, 0.0, 0.0),
100.0);
// Set up the background
Background bg = new Background(bgColor);
bg.setApplicationBounds(bounds);
objScale.addChild(bg);
// Create a Sphere object, generate one copy of the sphere,
// and add it into the scene graph.
Material m = new Material(objColor, eColor, objColor, sColor, 100.0f);
Appearance a = new Appearance();
m.setLightingEnable(true);
a.setMaterial(m);
Sphere sph = new Sphere(1.0f, Sphere.GENERATE_NORMALS, 80, a);
objScale.addChild(sph);
// Create the transform group node for the each light and initialize
// it to the identity. Enable the TRANSFORM_WRITE capability so that
// our behavior code can modify it at runtime. Add them to the root
// of the subgraph.
TransformGroup l1RotTrans = new TransformGroup();
l1RotTrans.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
objScale.addChild(l1RotTrans);
TransformGroup l2RotTrans = new TransformGroup();
l2RotTrans.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
objScale.addChild(l2RotTrans);
// Create transformations for the positional lights
t = new Transform3D();
Vector3d lPos1 = new Vector3d(0.0, 0.0, 2.0);
t.set(lPos1);
TransformGroup l1Trans = new TransformGroup(t);
l1RotTrans.addChild(l1Trans);
t = new Transform3D();
Vector3d lPos2 = new Vector3d(0.5, 0.8, 2.0);
t.set(lPos2);
TransformGroup l2Trans = new TransformGroup(t);
l2RotTrans.addChild(l2Trans);
// Create Geometry for point lights
ColoringAttributes caL1 = new ColoringAttributes();
ColoringAttributes caL2 = new ColoringAttributes();
caL1.setColor(lColor1);
caL2.setColor(lColor2);
Appearance appL1 = new Appearance();
Appearance appL2 = new Appearance();
appL1.setColoringAttributes(caL1);
appL2.setColoringAttributes(caL2);
l1Trans.addChild(new Sphere(0.05f, appL1));
l2Trans.addChild(new Sphere(0.05f, appL2));
// Create lights
AmbientLight aLgt = new AmbientLight(alColor);
Light lgt1 = null;
Light lgt2 = null;
Point3f lPoint = new Point3f(0.0f, 0.0f, 0.0f);
Point3f atten = new Point3f(1.0f, 0.0f, 0.0f);
Vector3f lDirect1 = new Vector3f(lPos1);
Vector3f lDirect2 = new Vector3f(lPos2);
lDirect1.negate();
lDirect2.negate();
switch (lightType) {
case DIRECTIONAL_LIGHT:
lgt1 = new DirectionalLight(lColor1, lDirect1);
lgt2 = new DirectionalLight(lColor2, lDirect2);
break;
case POINT_LIGHT:
lgt1 = new PointLight(lColor1, lPoint, atten);
lgt2 = new PointLight(lColor2, lPoint, atten);
break;
case SPOT_LIGHT:
lgt1 = new SpotLight(lColor1, lPoint, atten, lDirect1,
25.0f * (float) Math.PI / 180.0f, 10.0f);
lgt2 = new SpotLight(lColor2, lPoint, atten, lDirect2,
25.0f * (float) Math.PI / 180.0f, 10.0f);
break;
}
// Set the influencing bounds
aLgt.setInfluencingBounds(bounds);
lgt1.setInfluencingBounds(bounds);
lgt2.setInfluencingBounds(bounds);
// Add the lights into the scene graph
objScale.addChild(aLgt);
l1Trans.addChild(lgt1);
l2Trans.addChild(lgt2);
// Create a new Behavior object that will perform the desired
// operation on the specified transform object and add it into the
// scene graph.
Transform3D yAxis = new Transform3D();
Alpha rotor1Alpha = new Alpha(-1, Alpha.INCREASING_ENABLE, 0, 0, 4000,
0, 0, 0, 0, 0);
RotationInterpolator rotator1 = new RotationInterpolator(rotor1Alpha,
l1RotTrans, yAxis, 0.0f, (float) Math.PI * 2.0f);
rotator1.setSchedulingBounds(bounds);
l1RotTrans.addChild(rotator1);
// Create a new Behavior object that will perform the desired
// operation on the specified transform object and add it into the
// scene graph.
Alpha rotor2Alpha = new Alpha(-1, Alpha.INCREASING_ENABLE, 0, 0, 1000,
0, 0, 0, 0, 0);
RotationInterpolator rotator2 = new RotationInterpolator(rotor2Alpha,
l2RotTrans, yAxis, 0.0f, 0.0f);
bounds = new BoundingSphere(new Point3d(0.0, 0.0, 0.0), 100.0);
rotator2.setSchedulingBounds(bounds);
l2RotTrans.addChild(rotator2);
// Create a position interpolator and attach it to the view
// platform
TransformGroup vpTrans = u.getViewingPlatform()
.getViewPlatformTransform();
Transform3D axisOfTranslation = new Transform3D();
Alpha transAlpha = new Alpha(-1, Alpha.INCREASING_ENABLE
| Alpha.DECREASING_ENABLE, 0, 0, 5000, 0, 0, 5000, 0, 0);
axisOfTranslation.rotY(-Math.PI / 2.0);
PositionInterpolator translator = new PositionInterpolator(transAlpha,
vpTrans, axisOfTranslation, 2.0f, 3.5f);
translator.setSchedulingBounds(bounds);
objScale.addChild(translator);
// Let Java 3D perform optimizations on this scene graph.
objRoot.compile();
return objRoot;
}
public SphereMotion() {
}
public void init() {
setLayout(new BorderLayout());
GraphicsConfiguration config = SimpleUniverse
.getPreferredConfiguration();
Canvas3D c = new Canvas3D(config);
add("Center", c);
u = new SimpleUniverse(c);
BranchGroup scene = createSceneGraph(u);
// 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();
}
//
// The following allows SphereMotion to be run as an application
// as well as an applet
//
public static void main(String[] args) {
// Parse the Input Arguments
String usage = "Usage: java SphereMotion [-point | -spot | -dir]";
for (int i = 0; i < args.length; i++) {
if (args[i].startsWith("-")) {
if (args[i].equals("-point")) {
System.out.println("Using point lights");
lightType = POINT_LIGHT;
} else if (args[i].equals("-spot")) {
System.out.println("Using spot lights");
lightType = SPOT_LIGHT;
} else if (args[i].equals("-dir")) {
System.out.println("Using directional lights");
lightType = DIRECTIONAL_LIGHT;
} else {
System.out.println(usage);
System.exit(0);
}
} else {
System.out.println(usage);
System.exit(0);
}
}
new MainFrame(new SphereMotion(), 700, 700);
}
}
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