Hi,
You can use the new API in v1.3
Behavior setSchedulingInterval(interval)
to use 2 behaviors instead of one without jitters.
See attachment for an example.
- Kelvin
---------------
Java 3D Team
Sun Microsystems Inc.
>Date: Thu, 11 Apr 2002 14:37:30 -0600
>From: SUBSCRIBE JAVA3D-INTEREST Anonymous <[EMAIL PROTECTED]>
>Subject: [JAVA3D] URGENT : question on processStimulus method
>To: [EMAIL PROTECTED]
>Delivered-to: [EMAIL PROTECTED]
>Delivered-to: [EMAIL PROTECTED]
>
>Hi,
>
>I have a behaviour and during the processStimulus method I change the position
of the camera (and the position of an avatar attached under the camera's
transformGroup), the LinesStripArray geometry created BY_REF of a shape3D and I
notice that the update of camera position and the shape3D is not synchronized.
>
>Is this normal ?
>
>How can I synchronize multiple updates on differents objects on screen using a
behaviour ?
>
>Thanks in advance !
>
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/*
*
* "@(#)BehaviorIntervalTest.java 1.1 01/06/04"
*
* Copyright (c) 1996-1998 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
* 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.
*
* This software is not designed or intended for use in on-line control of
* aircraft, air traffic, aircraft navigation or aircraft communications; or in
* the design, construction, operation or maintenance of any nuclear
* facility. Licensee represents and warrants that it will not use or
* redistribute the Software for such purposes.
*/
import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;
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.*;
public class BehaviorIntervalTest extends Applet implements ItemListener {
CameraFollowBehavior camera;
RotationInterpolator rotator;
Choice rotationChoiceBox = new Choice();
Choice cameraChoiceBox = new Choice();
public BranchGroup createSceneGraph(SimpleUniverse u) {
// Create the root of the branch graph
BranchGroup objRoot = new BranchGroup();
// 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);
objRoot.addChild(objTrans);
objTrans.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
// Create a simple shape leaf node, add it to the scene graph.
objTrans.addChild(new ColorCube(0.4));
// 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 rotationAlpha = new Alpha(-1, Alpha.INCREASING_ENABLE,
0, 0,
4000, 0, 0,
0, 0, 0);
rotator = new RotationInterpolator(rotationAlpha, objTrans, yAxis,
0.0f, (float) Math.PI*2.0f);
BoundingSphere bounds =
new BoundingSphere(new Point3d(0.0,0.0,0.0), 100.0);
rotator.setSchedulingBounds(bounds);
rotator.setSchedulingInterval(5);
objTrans.addChild(rotator);
camera = new CameraFollowBehavior(objTrans,
u.getViewingPlatform().getMultiTransformGroup().getTransformGroup(0));
// set this to run AFTER rotation intepolator
camera.setSchedulingInterval(6);
camera.setSchedulingBounds(bounds);
objTrans.addChild(camera);
// Have Java 3D perform optimizations on this scene graph.
objRoot.compile();
return objRoot;
}
public BehaviorIntervalTest() {
setLayout(new BorderLayout());
GraphicsConfiguration config =
SimpleUniverse.getPreferredConfiguration();
Canvas3D c = new Canvas3D(config);
add("Center", c);
Panel intervalPanel = new Panel();
for (int i=0; i < Behavior.getNumSchedulingIntervals(); i++) {
rotationChoiceBox.add("" + i);
cameraChoiceBox.add("" + i);
}
rotationChoiceBox.addItemListener(this);
cameraChoiceBox.addItemListener(this);
intervalPanel.setLayout(new FlowLayout());
intervalPanel.add(new Label("Rotation behavior"));
intervalPanel.add(rotationChoiceBox);
intervalPanel.add(new Label("Camera follow behavior"));
intervalPanel.add(cameraChoiceBox);
add("South", intervalPanel);
add("North", new Label("Behavior scheduling interval test"));
SimpleUniverse u = new SimpleUniverse(c);
// Create a simple scene and attach it to the virtual universe
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);
rotationChoiceBox.select(rotator.getSchedulingInterval());
cameraChoiceBox.select(camera.getSchedulingInterval());
}
public void itemStateChanged(ItemEvent e) {
int interval = Integer.parseInt((String) e.getItem());
if (e.getSource() == rotationChoiceBox) {
rotator.setSchedulingInterval(interval);
} else {
camera.setSchedulingInterval(interval);
}
}
//
// The following allows BehaviorIntervalTest to be run as an application
// as well as an applet
//
public static void main(String[] args) {
System.out.println("This example demonstrate a camera chasing a rotating
cube.");
System.out.println("You will see the cube will jitter if rotation interpolator
behavior scheduling interval level is same or larger than camera behavior.\n");
new MainFrame(new BehaviorIntervalTest(), 512, 512);
}
}
/*
*
* "@(#)CameraFollowBehavior.java 1.1 01/06/04"
*
* Copyright (c) 1996-1998 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
* 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.
*
* This software is not designed or intended for use in on-line control of
* aircraft, air traffic, aircraft navigation or aircraft communications; or in
* the design, construction, operation or maintenance of any nuclear
* facility. Licensee represents and warrants that it will not use or
* redistribute the Software for such purposes.
*/
import javax.vecmath.*;
import javax.media.j3d.*;
import java.util.*;
public class CameraFollowBehavior extends Behavior
{
WakeupCondition wakeup = new WakeupOnElapsedFrames(0);
TransformGroup rotTarget;
TransformGroup camera;
Transform3D trans = new Transform3D();
Matrix4d zTrans = new Matrix4d();
Matrix4d mat = new Matrix4d();
public CameraFollowBehavior(TransformGroup rotTarget, TransformGroup camera) {
this.rotTarget = rotTarget;
this.camera = camera;
}
public void initialize() {
mat.setIdentity();
zTrans.setIdentity();
zTrans.setTranslation(new Vector3d(0, 0, 2));
wakeupOn(wakeup);
}
public void processStimulus(Enumeration criteria) {
if ((camera != null) && (rotTarget != null)) {
rotTarget.getTransform(trans);
trans.get(mat);
mat.mul(zTrans);
trans.set(mat);
camera.setTransform(trans);
}
wakeupOn(wakeup);
}
}
