Ingo,
Thanks for your bug reports. Here are the breakdown of our
finding :
Bug 1 : It is not a bug.
You've constructed a RenderingAttributes with alpha testing disable. That
is why you've to do make a separate setAlphaTestFunction() call.
RenderingAttributes.ALWAYS - pixels are always drawn, irrespective of the alpha
value. This effectively disables alpha testing. This is the default setting.
Replace :
RenderingAttributes ra =
new RenderingAttributes(false, false,
0.0f, RenderingAttributes.ALWAYS);
with :
RenderingAttributes ra =
new RenderingAttributes(false, false,
0.0f, RenderingAttributes.GREATER);
Bug 3 : This is a Java3D bug and it will be fixed in Java3D 1.3beta2 release.
> I was not able to reproduce the depth buffer problem in a simple test
> program. I also think, that it is not a Raster specific problem. I
> have not used setDepthBufferEnable(false) before I started playing
> with Raster. But my understanding is, that objects, which have the
> depth buffer disabled, should always be drawn on top of all other
> objects with an enabled depth buffer, regardless of their z-location
> in the world. Is this assumption right?
Yes, depth test is disabled.
- Chien Yang
Java 3D Team.
> When I tested disabling the depth buffer on a LineStripArray in my
> applet, where this would be quite usefull, I noticed, that it did not
> work either. But again, for me it's difficult to isolate the problem.
>
> Regards,
>
> Ingo
>
>
> ===File ~/RasterTest.java===================================
> import java.awt.image.BufferedImage;
> import java.awt.*;
> import javax.swing.JFrame;
> import javax.media.j3d.*;
> import javax.vecmath.*;
> import com.sun.j3d.utils.universe.*;
> import com.sun.j3d.utils.behaviors.mouse.*;
> import com.sun.j3d.utils.geometry.Sphere;
>
> public class RasterTest extends JFrame {
> public RasterTest() {
> Canvas3D canvas = new Canvas3D(
> SimpleUniverse.getPreferredConfiguration());
> SimpleUniverse universe = new SimpleUniverse(canvas);
> universe.addBranchGraph(createSceneGraph());
>
> Transform3D vpLocation = new Transform3D();
> TransformGroup vptg = universe.getViewingPlatform(
> ).getViewPlatformTransform();
> vptg.getTransform(vpLocation);
> vpLocation.setTranslation(new Vector3d(0.0, 0.0, 8.0));
> vptg.setTransform(vpLocation);
> canvas.setSize(300, 300);
> getContentPane().add(canvas);
> setDefaultCloseOperation(EXIT_ON_CLOSE);
> pack();
> }
>
> public static void main(String[] args) {
> RasterTest frame = new RasterTest();
> frame.show();
> }
>
> private BranchGroup createSceneGraph() {
> BranchGroup branch = new BranchGroup();
>
> // TransformGroup for MouseBehaviors
> TransformGroup tg = new TransformGroup();
> tg.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
> tg.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
> branch.addChild(tg);
>
> MouseZoom myMouseZoom = new MouseZoom();
> myMouseZoom.setTransformGroup(tg);
> myMouseZoom.setSchedulingBounds(new BoundingSphere());
> branch.addChild(myMouseZoom);
>
> DirectionalLight light = new DirectionalLight();
> light.setInfluencingBounds(new BoundingSphere(new Point3d(), 1000));
> branch.addChild(light);
>
> // Add a Background
> Background background = new Background(new Color3f(1.0f, 0.0f, 0.0f));
> background.setApplicationBounds(new BoundingSphere(new Point3d(),
> 1000));
> branch.addChild(background);
>
> // Add a lit Sphere
> Appearance app = new Appearance();
> app.setMaterial(new Material());
> Sphere sphere = new Sphere(1.0f, app);
> tg.addChild(sphere);
>
> // Add the Raster
> tg.addChild(createLabel("Cl"));
>
> return branch;
> }
>
> private Shape3D createLabel(String text) {
> Point3f rasterPos = new Point3f(0.0f, 0.0f, 0.0f);
> Color textColor = new Color(0, 255, 255, 255); // cyan
> Color bgColor = new Color(255, 255, 255, 0); // transparent white
> BufferedImage bufferedImage = new BufferedImage(
> 35, 15, BufferedImage.TYPE_INT_ARGB);
> Graphics2D g = bufferedImage.createGraphics();
>
> // Appearance for Raster
> Appearance labelApp = new Appearance();
> RenderingAttributes ra = new RenderingAttributes(
> false, false, 0.0f, RenderingAttributes.ALWAYS);
> // To get a real transparent background, uncomment the following line!
> //ra.setAlphaTestFunction(RenderingAttributes.GREATER);
> labelApp.setRenderingAttributes(ra);
>
> // Clear the background
> g.setBackground(bgColor);
> g.clearRect(0, 0, 35, 15);
>
> // Draw the text
> g.setColor(textColor);
> g.drawString(text, 2, 12);
> g.dispose();
>
> ImageComponent2D imageComponent2D = new ImageComponent2D(
> ImageComponent2D.FORMAT_RGBA, bufferedImage);
> Raster labelRaster = new Raster(rasterPos, Raster.RASTER_COLOR, 0, 0,
> 35, 15, imageComponent2D, null);
> labelRaster.setDstOffset(0, 50); // This has no effect!!!
> // To see the effect of the y-offset, you also have to set the
x-offset!
> //labelRaster.setDstOffset(-50, 50);
>
> return new Shape3D(labelRaster, labelApp);
> }
> }
> ============================================================
>
>
> >Ingo,
> > Please send us test programs for all 3 cases. It will be great
> >if we can have them ASAP; we're near to our next code freeze for j3d1.3beta2
> >release.
> >
> >thanks,
> >
> >- Chien Yang.
> > Java 3D Team.
> >
> >>
> >> Hi all,
> >>
> >> after playing with Raster for labelling objects to get rid of my
> >> Text2D/OrientedShape3D combination and getting it to work, I want to
> >> tell you about three things I have noticed with j3d 1.3b1. I don't
> >> know if these are intended or bugs.
> >>
> >> 1) To make transparency work with the Background node you have to set
> >> another alpha test function in your Rendering Attributes than the
> >> default function ALWAYS (assuming you have an ImageComponent2D with
> >> a transparent background).
> >>
> >> 2) If you disable the depth buffer in the RenderingAttributes in order
> >> to have your label staying always on top but you set your Raster
> >> position to (0, 0, 0) the depth buffer is enabled regardless of
> >> your settings.
> >>
> >> 3) If you use setDstOffset(x, y) with x = 0, the y-coordinate is also
> >> ignored.
>
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