hi,ALL
nice day to meet u all.
now I am dealing with the particle system,but I just can not make the lovely pari
tlce show on me scrreen.I downloaded the code (version 0.6) from code.j3d.org and
also the snapshot(20030822).I really wanna to make use of the latest version.But
the latest have no Sample code.While the sample code attached with v0.6 just do
not work for the "empty map".Before I ask for this request I have struggle for se
veral days and nights .I am very tired and frustred of debug the program .You kno
w ,for it, I even browse all the "black box"(the library).Just can not,Ok,this is
the details:
package particle3;
/*****************************************************************************
* Copyright (c) 2002 Daniel Selman
* Java Source
*
* This source is licensed under the GNU LGPL v2.1
* Please read http://www.gnu.org/copyleft/lgpl.html for more information
*
* This source is based on the SUN HelloUniverse example.
****************************************************************************/
import java.applet.Applet;
import java.awt.BorderLayout;
import java.awt.event.*;
import java.awt.GraphicsConfiguration;
import com.sun.j3d.utils.applet.MainFrame;
import com.sun.j3d.utils.geometry.ColorCube;
import com.sun.j3d.utils.universe.*;
import javax.media.j3d.*;
import javax.vecmath.*;
// imports for the ParticleSystem
import org.j3d.geom.particle.*;
import java.util.*;
/**
* ParticleTest shows how you can easily add complex particle-
* based animation to your Java 3D applications. It adds a
* smoke particle system, where each particle is acted on
* by wind, gravity and is constrained within a BoundingBox.
* <p>
* Particles are texture mapped and represented using a single
* TriangleArray in BY_REFERENCE mode.
*
* @author Daniel Selman
* @version $Revision: 1.1 $
*/
public class ParticleTest
extends Applet {
private SimpleUniverse u = null;
public BranchGroup createSceneGraph() {
// Create the root of the branch graph
BranchGroup objRoot = new BranchGroup();
// Create the TransformGroup node and initialize it to the
// identity. Enable the TRANSFORM_WRITE capability so that
// our behavior code can modify it at run time. Add it to
// the root of the subgraph.
TransformGroup objTrans = new TransformGroup();
objTrans.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
objRoot.addChild(objTrans);
// *********************************************************************
// begin particle code
// *********************************************************************
// create the configuration environment for the ParticleSystems
Map environment = new Hashtable();
// create the ParticleInitializer for the ParticleSystem
// the initializer is used to control how long particles within
// the system live and how they are reinitialized when they die.
// this simple initializer lets particles live for 200 iterations
// and moves them to point 0,0,0 when they die
//ParticleInitializer particleInitializer =
//new MaxAgePointEmitter(300, 0, -0.5, 0);
float[] position = {
1, 2, 3};
float[] color = {
100, 100, 100, 2};
float variation = 1;
int maxParticleCount = 500;
ParticleInitializer particleInitializer = (new MaxAgePointEmitter(300,
maxParticleCount,
position, color, variation));
// create a "smoke" particle system with 1000 particles
// the properties for each particle are loaded from a
// property file ("smoke" is used as a key)
final int particleCount = 500;
ParticleSystem smokeParticleSystem =
new TriangleArrayByRefParticleSystem("aa", 500,
true);
smokeParticleSystem.setParticleInitializer(particleInitializer);
/*new TriangleArrayByRefParticleSystem("smoke", particleCount,
particleInitializer,
environment);*/
// create the ParticleSystemManager for the ParticleSystem
// this instance uses a behavior and will trigger the Particle System
// every frame
ParticleSystemManager particleSystemManager =
// new ParticleSystemManager(new WakeupOnElapsedFrames(1), environment);
new ParticleSystemManager(new WakeupOnElapsedFrames(1));
BoundingSphere bounds =
new BoundingSphere(new Point3d(0.0, 0.0, 0.0), 500.0);
// set the bounds on the ParticleSystemManager so it will be scheduled
particleSystemManager.setSchedulingBounds(bounds);
// add the smokeParticleSystem to its manager
particleSystemManager.addParticleSystem(smokeParticleSystem);
// this will cause smokeParticleSystem to run for 2000 frames
final int maxFrameCount = 2000;
smokeParticleSystem.addParticleFunction(
new FrameCountParticleFunction(maxFrameCount));
// this will apply an upward wind force to the particles
smokeParticleSystem.addParticleFunction(
new WindParticleFunction(new Vector3d(0.0, 0.003, 0.0)));
// this will apply a gravity force to the particles
smokeParticleSystem.addParticleFunction(
new GravityParticleFunction());
// this will do basic F=m.a position updates on the particles
smokeParticleSystem.addParticleFunction(
new PhysicsFunction());
// this will clamp the position of the particles to within a box
final double size = 0.8;
smokeParticleSystem.addParticleFunction(
new BoundingBoxParticleFunction(new BoundingBox(
new Point3d( -size, -size, -size),
new Point3d(size, size, size))
));
// add the particleSystemManager (Behavior) to the scenegraph
objTrans.addChild(particleSystemManager);
// add the geometry for the ParticleSystem to the scenegraph
objTrans.addChild(smokeParticleSystem.getNode());
// *********************************************************************
// end particle code
// *********************************************************************
// Create a new Behavior object that will perform the
// desired operation on the specified transform and add
// it into the scene graph.
Transform3D yAxis = new Transform3D();
Alpha rotationAlpha = new Alpha( -1, 4000);
RotationInterpolator rotator =
new RotationInterpolator(rotationAlpha, objTrans, yAxis,
0.0f, (float) Math.PI * 2.0f);
rotator.setSchedulingBounds(bounds);
objRoot.addChild(rotator);
// Have Java 3D perform optimizations on this scene graph.
objRoot.compile();
return objRoot;
}
public ParticleTest() {
}
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.removeAllLocales();
}
//
// The following allows ParticleTest to be run as an application
// as well as an applet
//
public static void main(String[] args) {
new MainFrame(new ParticleTest(), 256, 256);
}
}
As you can see, I just make a little change on the Dear Mr.Selman code to fit for
the latest j3d particleSystem library.But it just no OK:(
this is the errors:
Exception occurred during Behavior execution:
java.lang.NullPointerException
at org.j3d.geom.particle.TriangleArrayByRefParticle.updateGeometry(TriangleArray
ByRefParticle.java:92)
at org.j3d.geom.particle.ByRefParticleSystem.updateGeometry(ByRefParticleSystem.
java:164)
at org.j3d.geom.particle.ParticleSystem.update(ParticleSystem.java:223)
at org.j3d.geom.particle.ByRefParticleSystem.update(ByRefParticleSystem.java:204
)
at org.j3d.geom.particle.ParticleSystemManager.update(ParticleSystemManager.java
:56)
at org.j3d.geom.particle.ParticleSystemManager.processStimulus(ParticleSystemMan
ager.java:46)
at javax.media.j3d.BehaviorScheduler.doWork(BehaviorScheduler.java:172)
at javax.media.j3d.J3dThread.run(J3dThread.java:250)
well ,Any help will be appreciated much ,thankx a lot :)
yours sincerely
Qingfei Yuan
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