[JAVA3D] Raster Depth Information being ignored

[Mark McKay]

I have a raster of data which I would like to draw over top of all
geometry in my scene.  However, no matter what values I pass to the
array which should define the depth information, the color pixelsin the
raster are written at the same depth as the point that defines the
raster's location in the scene graph.  I've also tried a two step
process where I first write depth information and then color information
in two different rasters.  My depth information simply seems to be
ignored.  Is there any way to get these rasters to appear above all the
geometry?
Mark McKay

   private Shape3D buildFgRaster()
   {
       //Create raster image of logo
       Image logoImage =
AppImageLoader.instance().getImage(AppImageLoader.IM_AUTO_REF_LOGO);
       int width = logoImage.getWidth(null);
       int height = logoImage.getHeight(null);
       BufferedImage bi = new BufferedImage(width, height,
BufferedImage.TYPE_4BYTE_ABGR);
       Graphics2D g = bi.createGraphics();
       g.drawImage(logoImage, 0, 0, null);
       g.dispose();
       ImageComponent2D ic = new
ImageComponent2D(ImageComponent.FORMAT_RGBA, bi);
       //Create foreground depth buffer
       DepthComponentFloat dc = new DepthComponentFloat(width, height);
       float[] depthData = new float[width * height];
       for (int i = 0; i < width * height; i++)
       {
           depthData[i] = Float.POSITIVE_INFINITY;
       }
       dc.setDepthData(depthData);
       //Build raster
       javax.media.j3d.Raster raster = new javax.media.j3d.Raster(
           new Point3f(0.00005f, 0.00005f, -10f),
           javax.media.j3d.Raster.RASTER_COLOR_DEPTH,
           0, 0, width, height, ic, dc);
       raster.setClipMode(javax.media.j3d.Raster.CLIP_IMAGE);
       raster.setDstOffset(new Point(0, 0));
       return new Shape3D(raster);
   }
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