Java3D Alpha Problem

Hello,
I have a PositionInterpolator with an Alpha. I need to alter the Increasing- and/or Decreasing-Time of the Alpha-Object while the scene is running. When I do it, the value of my Alpha-Object alters nearly unpredictable... I mean, what's the philosophy of this Alpha-Obect? When eg the actual value of it is 0.5 and I know that it is increasing and now I alter the Increasing-Time to the double value of what it was before, my alpha value won't change to 0.25, as one might guess... so what's the philosophy???
Thanks for your help...
braveheart

Thank you for your post Alex,
though it's not quite the 'right answer' for that I searched but it gave me a good hint at where to search or what to try. So i have tested the alpha object with it's startTime and the actual time.
As far as I've found it goes this way: assuming that you have an alpha object with decreasing and increasing capability and the in- and decreasingTime is 1000ms. Now the alpha value is computed as follows: the actualTime of your system (System.currentTimeInMillis) less the startedTime of your alphaObject, the result mod-divided through your in- or decreasingTime, this in turn gives you the rest of your in- or decreasing movement.
Eg if in the above stated example the passedTime is 7300ms, then you are in the decreasing-mode and have still 700ms to go. Therefore the alphaValue will be 0.7. This at least is valid when you haven't set any in- or decreasingRampDuration... this makes the equation quite 'unpredictable'...
But I find this philosophy quite nonsensical... because it don't take into account the actual movement but computes the alphaValue from the start, as if it had moved through the passedTime with the new in/decreasingTime... which really isn't the case... so I think that your velocity assumption isn't quite the case here??
I must admit that the java3d functionality classes aren't really what you might expect from a java derived language. I don't think that I will ever again write a programm in java3d... it don't seem like real programming but having to fiddle with all kinds of inadequacies... well, again, thank you for your post...
dominik

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import com.sun.j3d.utils.geometry.*;
import com.sun.j3d.utils.universe.*;
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Hi tesla66 I'm sorry if I didn't correct your code, but drop some new code trying to solve the problem. I've used the cube instead the sphere because it's easier to see is rotating but just change "new ColorCube(0.4f)" with " new Sphere( 0.4f )". I wrote even some coments tought they're helpful. Tell me if I solved the problem
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import javax.swing.*;
import javax.media.j3d.*;
import javax.vecmath.*;
import com.sun.j3d.utils.universe.SimpleUniverse;
import com.sun.j3d.utils.geometry.*;
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Intersecting Layers with alpha problem

Hi,
I have a problem with Motion when two layers intersect. On layer is totally opaque, and the second layer has transparent areas. The problem occurs in areas when the transparent areas intersect with opaque areas. In those regions I get a dark gray line appearing.
Check out this image and you will see what I mean.
http://jack.fxhome.com/MotionLine.jpg
Note: I get this unwanted line in the exported frame as well.
Why does motion do this?
Is there anyway around this?
Thanks

1) Try setting your Render Quality to Best (under the View pop-up menu)
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Hi all,
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Catheren,
This was taken from one of the Java 3D examples taken from the SDK. It is used to load an *.obj file. It uses the Canvas3D class.
*     @(#)ObjLoad.java 1.22 02/10/21 13:46:12
* Copyright (c) 1996-2002 Sun Microsystems, Inc. All Rights Reserved.
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* - Redistributions of source code must retain the above copyright
*   notice, this list of conditions and the following disclaimer.
* - Redistribution in binary form must reproduce the above copyright
*   notice, this list of conditions and the following disclaimer in
*   the documentation and/or other materials provided with the
*   distribution.
* Neither the name of Sun Microsystems, Inc. or the names of
* contributors may 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 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.
* You acknowledge that Software is not designed,licensed or intended
* for use in the design, construction, operation or maintenance of
* any nuclear facility.
import com.sun.j3d.loaders.objectfile.ObjectFile;
import com.sun.j3d.loaders.ParsingErrorException;
import com.sun.j3d.loaders.IncorrectFormatException;
import com.sun.j3d.loaders.Scene;
import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;
import com.sun.j3d.utils.applet.MainFrame;
import com.sun.j3d.utils.universe.*;
import javax.media.j3d.*;
import javax.vecmath.*;
import java.io.*;
import com.sun.j3d.utils.behaviors.vp.*;
import java.net.URL;
import java.net.MalformedURLException;
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    private boolean noStripify = false;
    private double creaseAngle = 60.0;
    private URL filename = null;
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        // appear in the scene.
        TransformGroup objScale = new TransformGroup();
        Transform3D t3d = new Transform3D();
        t3d.setScale(0.7);
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     if (!noStripify) flags |= ObjectFile.STRIPIFY;
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       (float)(creaseAngle * Math.PI / 180.0));
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       System.err.println(e);
       System.exit(1);
     catch (ParsingErrorException e) {
       System.err.println(e);
       System.exit(1);
     catch (IncorrectFormatException e) {
       System.err.println(e);
       System.exit(1);
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     bounds = new BoundingSphere(new Point3d(0.0,0.0,0.0), 100.0);
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       Transform3D yAxis = new Transform3D();
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                           0, 0,
                           4000, 0, 0,
                           0, 0, 0);
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           new RotationInterpolator(rotationAlpha, objTrans, yAxis,
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       objTrans.addChild(rotator);
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        Color3f bgColor = new Color3f(0.05f, 0.05f, 0.5f);
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      System.out.println(
     "Usage: java ObjLoad [-s] [-n] [-t] [-c degrees] <.obj file>");
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      System.out.println(" -n No triangulation");
      System.out.println(" -t No stripification");
      System.out.println(
     " -c Set crease angle for normal generation (default is 60 without");
      System.out.println(
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      System.exit(0);
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     if (filename == null) {
            // Applet
            try {
                URL path = getCodeBase();
                filename = new URL(path.toString() + "./galleon.obj");
            catch (MalformedURLException e) {
           System.err.println(e);
           System.exit(1);
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        GraphicsConfiguration config =
           SimpleUniverse.getPreferredConfiguration();
        Canvas3D c = new Canvas3D(config);
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     ViewingPlatform viewingPlatform = u.getViewingPlatform();
     PlatformGeometry pg = new PlatformGeometry();
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     Color3f ambientColor = new Color3f(0.1f, 0.1f, 0.1f);
     AmbientLight ambientLightNode = new AmbientLight(ambientColor);
     ambientLightNode.setInfluencingBounds(bounds);
     pg.addChild(ambientLightNode);
     // Set up the directional lights
     Color3f light1Color = new Color3f(1.0f, 1.0f, 0.9f);
     Vector3f light1Direction = new Vector3f(1.0f, 1.0f, 1.0f);
     Color3f light2Color = new Color3f(1.0f, 1.0f, 1.0f);
     Vector3f light2Direction = new Vector3f(-1.0f, -1.0f, -1.0f);
     DirectionalLight light1
         = new DirectionalLight(light1Color, light1Direction);
     light1.setInfluencingBounds(bounds);
     pg.addChild(light1);
     DirectionalLight light2
         = new DirectionalLight(light2Color, light2Direction);
     light2.setInfluencingBounds(bounds);
     pg.addChild(light2);
     viewingPlatform.setPlatformGeometry( pg );
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     viewingPlatform.setNominalViewingTransform();
     if (!spin) {
            OrbitBehavior orbit = new OrbitBehavior(c,
                                  OrbitBehavior.REVERSE_ALL);
            BoundingSphere bounds =
                new BoundingSphere(new Point3d(0.0, 0.0, 0.0), 100.0);
            orbit.setSchedulingBounds(bounds);
            viewingPlatform.setViewPlatformBehavior(orbit);
     u.addBranchGraph(scene);
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    public ObjLoad(String[] args) {
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     for (int i = 0 ; i < args.length ; i++) {
       if (args.startsWith("-")) {
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     spin = true;
     } else if (args[i].equals("-n")) {
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     } else if (args[i].equals("-c")) {
     if (i < args.length - 1) {
          creaseAngle = (new Double(args[++i])).doubleValue();
     } else usage();
     } else {
     usage();
     } else {
     try {
     if ((args[i].indexOf("file:") == 0) ||
          (args[i].indexOf("http") == 0)) {
          filename = new URL(args[i]);
     else if (args[i].charAt(0) != '/') {
          filename = new URL("file:./" + args[i]);
     else {
          filename = new URL("file:" + args[i]);
     catch (MalformedURLException e) {
     System.err.println(e);
     System.exit(1);
// Running as an applet
public ObjLoad() {
public void destroy() {
     u.cleanup();
// The following allows ObjLoad to be run as an application
// as well as an applet
public static void main(String[] args) {
new MainFrame(new ObjLoad(args), 700, 700);

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map.setPixel32(0,0,0x20fcfcfc);
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Hi;
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Note
the alpha flag must be set to false, which is the source of my problem,
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private function _createPalette(idx:int):void {
_redArray = [];
_greenArray = [];
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_greenArray.push(0);
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added that if clause to capture when the color is black because that's
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TIA,
George
package {
import flash.display.Bitmap;
import flash.display.BitmapData;
import flash.display.BlendMode;
import flash.display.DisplayObject;
import flash.display.Loader;
import flash.display.LoaderInfo;
import flash.display.Sprite;
import flash.display.StageQuality;
import flash.display.StageScaleMode;
import flash.events.Event;
import flash.events.MouseEvent;
import flash.filters.ColorMatrixFilter;
import flash.filters.ConvolutionFilter;
import flash.geom.ColorTransform;
import flash.geom.Point;
import flash.system.LoaderContext;
import flash.net.SharedObject;
import flash.net.URLRequest;
import flash.text.TextField;
import flash.text.TextFieldAutoSize;
import flash.text.TextFormat;
[SWF(width=465, height=92, backgroundColor=0xffffff, frameRate=30)]
public class Fire extends Sprite {
private static const ZERO_POINT:Point = new Point();
private var _fireColor:BitmapData;
private var _currentFireColor:int;
private var _canvas:Sprite;
private var _grey:BitmapData;
private var _spread:ConvolutionFilter;
private var _cooling:BitmapData;
private var _color:ColorMatrixFilter;
private var _offset:Array;
private var _fire:BitmapData;
private var _redArray:Array;
private var _zeroArray:Array;
private var _greenArray:Array;
private var _blueArray:Array;
private var _alphaArray:Array;
public function Fire() {
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addChild(new Bitmap(_fire));
_createCooling(0.16);
_createPalette(_currentFireColor = 0);
addEventListener(Event.ENTER_FRAME, _update);
//            stage.addEventListener(MouseEvent.CLICK, _onClick);
private function _onClick(e:MouseEvent):void {
if (++_currentFireColor == int(_fireColor.height / 32)) {
_currentFireColor = 0;
_createPalette(_currentFireColor);
private function _createEmitter()isplayObject {
var tf:TextField = new TextField();
tf.selectable = false;
tf.autoSize = TextFieldAutoSize.LEFT;
tf.defaultTextFormat = new TextFormat('Verdana', 80, 0xffffff, true);
tf.text = '__________________________________________';
tf.x = (465 - tf.width) / 2;
tf.y = 0;
//            tf.y = (465 - tf.height) / 2;
return tf;
private function _createCooling(a:Number):void {
_color = new ColorMatrixFilter([
a, 0, 0, 0, 0,
0, a, 0, 0, 0,
0, 0, a, 0, 0,
0, 0, 0, 1, 0
private function _createPalette(idx:int):void {
_redArray = [];
_greenArray = [];
_blueArray = [];
_alphaArray = [];
for (var i:int = 0; i < 256; i++) {
var gp:int = new int();
gp = _fireColor.getPixel(i, 0);
if (gp < 1050112)
_redArray.push(255);
_alphaArray.push(255);
_greenArray.push(255);
_blueArray.push(255);
} else {
_redArray.push(gp);
_alphaArray.push(0);
_greenArray.push(0);
_blueArray.push(0);
private function _update(e:Event):void {
_grey.draw(_canvas);
_grey.applyFilter(_grey, _grey.rect, ZERO_POINT, _spread);
_cooling.perlinNoise(50, 50, 2, 982374, false, false, 0, true, _offset);
_offset[0].x += 2.0;
_offset[1].y += 2.0;
_cooling.applyFilter(_cooling, _cooling.rect, ZERO_POINT, _color);
_grey.draw(_cooling, null, null, BlendMode.SUBTRACT);
_grey.scroll(0, -3);
_fire.paletteMap(_grey, _grey.rect, ZERO_POINT, _redArray, _greenArray, _blueArray, _alphaArray);

I am importing it into another *.as file:
    import Fire;
       var myFire:Fire = new Fire();
           addChild(myFire);
TIA,
beno

JAVA3D rotation problem

I'm using JAVA3D that creates a map. The map is split into 4 parts. I forced each part to rotate only around the X-axis and this is done with the user clicking on it with the mouse. I want to limit the rotation where the user can rotate up to 90 degrees only downwards, and want to eliminate the option of rotation upwards. Is that possible.
Another question is that when the user rotates one of the parts, the part comes out towards the user. Is it possible i can stop that and make it rotate on itself?
Thanks in advance

well my dear friend sorry to disappoint you but i did understand and that's the way rotX/Y/Z work within the Transform3D.
the behavior you desire by the rotation is based on a cylindric coordinate system in which the point of view will move on the cylinder while the upVector of the lookAt method stay at the Y axis(Y axis is "up" in Java3D).
since the Transform3d is based on spherical coordinate system you can't use it.
the only way i know is to write an object as the Transform3d but much simpler, well lets see:
class Transform extends Transform3D {
   Point3d position=new Point3d();
   Point3d lookingAt=new Point3d(1,0,0); // looking at the x axis
   Vector3d upVector=new Vector3d(0,1,0); // y is up
   double totalAngleXZ=0; // its a must to add the angle and to calculate it from the top since it creates a bug later on
   double totalAngleY=0; // its a must to add the angle and to calculate it from the top since it creates a bug later on
   public void rotXZ(double angle) {
      totalAngleXZ+= angle;
      lookAt();
   public void rotY(double angle) {
      totalAngleY+= angle;
      lookAt();
   private void lookAt() {
        lookingAt.set(Math.cos(totalAngleXZ),Math.cos(totalAngleY),Math.sin(totalAngleXZ));
        lookAt(position,lookingAt,upVector);
}now if i'm not mistaken this should work...
best of luck.

Alpha problem in Flash

I lately generated a single color wireframe graphic in
Illustrator, and saved this as .png format, set the background as
transparent, I imported it into Flash library as graphic symbol,
and drag it onto the stage, but the alpha channel was completely
disable, I couldn't apply transparency onto the wireframe object, I
wonder why?

I haven't seen this come up before, but usually this forum deals with end user issues. I'd recommend hoping over to bugbase.adobe.com and entering a bug. We'll take a look and let you know what we find.
Thanks,
Chris

Java3D game problem(about wall)?(urgent " )

I am developing a 3D shoot game which contain a 3D mase,but...why the wall is transparent when I run towards the wall??how can solve this problem??
Moreover,I wonder how to run smoothiy in 3D game??

yep..I see through to the other side(only left-side and right-side wall )..
Anyway I want to run on the plane smoothly and dont want to see inside and behind the wall..
following is the suitation of my game:
| * | | | * * |
| * | / | * * |
| * | / | * * |
| *| / \ * * |
| *| / \ * * |
| * \~ \ \ * * |
|*__________\__\________\ * * |
* is transparent

Java3D Picking Problem

Hi, I have problem with picking. I have two shapes 3D (for example) and if there are separately (not hidden) picking is OK. But when I rotate them using myMouseRotate or rotation.rotY(angle) so one of them is hiden, it's always pick me only one of them, even it's hidden. I use pickClosest() method. What's wrong?
Please help me
pozdrawiam
Wojtek

It doesn't work because I need to pick one of this shape. I think that it's something with rotation... Check this simply full code below. Press any key to rotate. At the begining you pick ColorCube and it' ok. But if you rotate 180 degrees you will pick ColorCube again and it's wrong. Additionally if you change "angle = 3.14/2;" to "angle = 3*3.14/2;" you can pick Sphere but can't pick ColorCube.
How can I solve it?? Maybe when I rotate something is change with direction of pick rays.
Code - Pick_1.java:
import com.sun.j3d.utils.picking.*;
import com.sun.j3d.utils.universe.SimpleUniverse;
import com.sun.j3d.utils.geometry.*;
import javax.media.j3d.*;
import javax.vecmath.*;
import java.awt.event.*;
import java.awt.*;
import com.sun.j3d.utils.behaviors.mouse.*;
import java.util.Enumeration;
public class Pick_1 extends MouseAdapter {
     private PickCanvas pickCanvas;
     static double angle = 0.0;
     public class SimpleBehavior extends Behavior{
     private TransformGroup targetTG;
     private Transform3D rotation = new Transform3D();
     // private double angle = 0.0;
     // create SimpleBehavior
     SimpleBehavior(TransformGroup targetTG){
     this.targetTG = targetTG;
     // initialize the Behavior
     // set initial wakeup condition
     // called when behavior beacomes live
     public void initialize(){
     // set initial wakeup condition
     this.wakeupOn(new WakeupOnAWTEvent(KeyEvent.KEY_PRESSED));
     // behave
     // called by Java 3D when appropriate stimulus occures
     public void processStimulus(Enumeration criteria){
     // decode event
     // do what is necessary
     angle += 0.1;
     rotation.rotY(angle);
     targetTG.setTransform(rotation);
     //rotation.set(new Vector3f(-0.1f, 0.0f, 0.0f));
     //targetTG.setTransform(rotation);
     this.wakeupOn(new WakeupOnAWTEvent(KeyEvent.KEY_PRESSED));
     public Pick_1()
     Frame frame = new Frame("Box and Sphere");
     GraphicsConfiguration config = SimpleUniverse.getPreferredConfiguration();
     Canvas3D canvas = new Canvas3D(config);
     canvas.setSize(400, 400);
     SimpleUniverse universe = new SimpleUniverse(canvas);
     BranchGroup group = new BranchGroup();
          TransformGroup objTransform = new TransformGroup();
     objTransform.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
     objTransform.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
     group.addChild(objTransform);
     /*      MouseRotate myMouseRotate = new MouseRotate();
     myMouseRotate.setTransformGroup(objTransform);
     myMouseRotate.setSchedulingBounds(new BoundingSphere());
     group.addChild(myMouseRotate);
     MouseTranslate myMouseTranslate = new MouseTranslate();
     myMouseTranslate.setTransformGroup(objTransform);
     myMouseTranslate.setSchedulingBounds(new BoundingSphere());
     group.addChild(myMouseTranslate);
     MouseZoom myMouseZoom = new MouseZoom();
     myMouseZoom.setTransformGroup(objTransform);
     myMouseZoom.setSchedulingBounds(new BoundingSphere());
     group.addChild(myMouseZoom);
     SimpleBehavior myRotationBehavior = new SimpleBehavior(objTransform);
     myRotationBehavior.setSchedulingBounds(new BoundingSphere());
          group.addChild(myRotationBehavior);
     //create a sphere
     Vector3f vector2 = new Vector3f(0.6f, 0.0f, 0.0f);
     Transform3D transform2 = new Transform3D();
     transform2.setTranslation(vector2);
     TransformGroup transformGroup2 = new TransformGroup(transform2);
     Appearance appearance = new Appearance();
     appearance.setPolygonAttributes(
     new PolygonAttributes(PolygonAttributes.POLYGON_LINE,
     PolygonAttributes.CULL_BACK,0.0f));
     Sphere sphere = new Sphere(0.1f,appearance);
     transformGroup2.addChild(sphere);
     objTransform.addChild(transformGroup2);
     // create a color cube
     Vector3f vector = new Vector3f(0.3f, 0.0f, 0.0f);
     Transform3D transform = new Transform3D();
     transform.setTranslation(vector);
     TransformGroup transformGroup = new TransformGroup(transform);
     ColorCube cube = new ColorCube(0.1);
     transformGroup.addChild(cube);
     objTransform.addChild(transformGroup);
     //dodatkowo przesuniecie od razu o 90 stopni
          Transform3D obrot = new Transform3D();
               angle = 3.14/2;
          obrot.rotY(angle);                                   //!!!!! takie przesuniecie dobrze dziala
     objTransform.setTransform(obrot);                //WIEC O CO CHODZI!!!!!!!!!!!!!!!
     universe.getViewingPlatform().setNominalViewingTransform();
     universe.addBranchGraph(group);
     frame.addWindowListener(new WindowAdapter() {
     public void windowClosing(WindowEvent winEvent) {
     System.exit(0);
     frame.add(canvas);
     pickCanvas = new PickCanvas(canvas, group);
     pickCanvas.setMode(PickCanvas.BOUNDS);
     canvas.addMouseListener(this);
     frame.pack();
     frame.show();
     public static void main( String[] args ) {
     new Pick_1();
     public void mouseClicked(MouseEvent e)
     pickCanvas.setShapeLocation(e);
     PickResult result = pickCanvas.pickClosest();
     if (result == null) {
     System.out.println("Nothing picked");
     } else {
     Primitive p = (Primitive)result.getNode(PickResult.PRIMITIVE);
     Shape3D s = (Shape3D)result.getNode(PickResult.SHAPE3D);
     if (p != null) {
     System.out.println(p.getClass().getName());
     } else if (s != null) {
     System.out.println(s.getClass().getName());
     } else{
     System.out.println("null");
     /*pickCanvas.setShapeLocation(e);
     PickResult result = pickCanvas.pickClosest();
     if (result == null) {
     System.out.println("Nothing picked");
     } else {
     // PickIntersection pi = result.getClosestIntersection(
     pickCanvas.getStartPosition();
     Shape3D s = (Shape3D)result.getNode(PickResult.SHAPE3D);
     System.out.println(s.getClass().getName());
} // end of class Pick

DisplayObject.alpha problem on MouseEvent

Hello,
I have a button (VehiclesButton) which on rollover I want it to trigger a mouse event so an image(VehiclesCentral) to the side of it (I've just set the alpha to 0 so its invisble, but its on the stage) will have its alpha increased to 100 and become visible
VehiclesButton.addEventListener(MouseEvent.MOUSE_OVER,test);
function test(e:MouseEvent):void
VehiclesCentral.DisplayObject.alpha = 100 ();
When I publish this though I get no compiler errors, only an error when I actually go onto it and rollover the button. I get the following error message:
TypeError: Error #1006: value is not a function.
at QualityPortal_fla::MainTimeline/test()
(Quality Protal_fla is the file name I am working on).
Thanks
Sean

Try:
VehiclesButton.addEventListener(MouseEvent.MOUSE_OVER,test);
function test(e:MouseEvent):void
VehiclesCentral.alpha = 1;

Java3D Alpha Problem

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