[JAVA3D] GraphicsContext3D.readRaster() problem - PLEASE HELP!!

[Richard Moffett]

I'd really appreciate some help with a problem I'm having with the
readRaster method in GraphicsContext3D.

I have a class which extends Canvas3D with a method to get a background
image for immediate mode rendering.  When I use readRaster(), I get an
exception:

"Unhandled exception in javaw.exe (OPENGL32.DLL) 0x0000005: Access violation"

The code leading up to readRaster in the method is pretty much identical to
Doug Gehringer's MixedImmediate examples, which run without any problems at
all:


class MarkingCanvas3D extends Canvas3D
{
        ImageComponent2D backgroundImageComponent;
        Raster backgroundRaster;
        Dimension canvasSize;
...
...

public void startImmediate()
{
        stopRenderer();

        canvasSize = getSize();

        if( (backgroundImageComponent==null) || (backgroundRaster==null) ||
(canvasSize.width != backgroundImageComponent.getWidth()) ||
(canvasSize.height != backgroundImageComponent.getHeight()) ) {
        backgroundImageComponent        = new
ImageComponent2D(ImageComponent.FORMAT_RGB, canvasSize.width,
canvasSize.height);

        backgroundRaster = new Raster( rasterPoint, Raster.RASTER_COLOR, 0, 0,
canvasSize.width, canvasSize.height, backgroundImageComponent, null);
}
        //read the current background image into the raster
        getGraphicsContext3D().readRaster(backgroundRaster);
...
...
}
}

I can't figure out what's going wrong. Can anyone help?

Thanks,

Richard

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