Did you try display.getGraphicsModeControl().setMissingTransparent(true)?
At 10:52 AM 3/4/2002, you wrote:
>I´m using VisAD to visualize radar and lightling data. Now I've inserted also
>a GIF image on the background by visad.data.gif.GIFForm. The image is apearing
>behind all the other data, as it shoud.
>The problem is that I could not make the undefined radar data invisible (alpha
>=0). I´m using a Integer2DSet and setting the points outside the radar range
>to Float.NaN but these points apear on the display´s background color.
>I also tried to map to RGBA instead of RGB but didn´t worked either.
>Thanks already Cicero A. W. Z.