[JAVA3D] Offscreen Rendering and memory problems

[Desiree Hilbring]

Hi everybody,

I am using an Offscreen Canvas for printing my view, the problem is that
the memory increases every time I render the offscreen canvas for a new
print, but it is never decreases. After the second print my application
dies.

I am working on Windows NT SP 6, with an Elsa Gladiac MX JDK 1.3.1 and
Java3D 1.2 ( I tried updating to Java3D 1.2.1 with no success).

What can I do to decrease the memory?

Thanks for your help in advance Desiree



Here are the relevant parts of my code:

I am using the offscreen example from the demos:

class OffScreenCanvas3D extends Canvas3D {
    OffScreenCanvas3D(GraphicsConfiguration graphicsConfiguration,
                      boolean offScreen) {

        super(graphicsConfiguration, offScreen);
    }

    BufferedImage doRender(int width, int height) {

        BufferedImage bImage =
            new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
        //new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

        ImageComponent2D buffer =
            new ImageComponent2D(ImageComponent.FORMAT_RGBA, bImage);
        //new ImageComponent2D(ImageComponent.FORMAT_RGB, bImage);

        setOffScreenBuffer(buffer);
        renderOffScreenBuffer();
        waitForOffScreenRendering();
        bImage = getOffScreenBuffer().getImage();

        return bImage;
    }

    public void postSwap() {
        // No-op since we always wait for off-screen rendering to complete
    }
}

This is the method, where I create my offscreen canvas, I tried to
collect the objects and run the garbage collector, without any success:

    /**
     * Printing in Java3D needs an additional Canvas with the view, this
     * Canvas is created in this method.
     */
    public void createPrintCanvas() {
        // Background
        createBackgroundNode(Color.white);

        GraphicsConfiguration config =
SimpleUniverse.getPreferredConfiguration();
        OffScreenCanvas3D offScreenCanvas3d = new
OffScreenCanvas3D(config,true);
        // Set the off-screen size based on a scale factor times the
        // on-screen size
        Screen3D sOn = c.getScreen3D();
        Screen3D sOff = offScreenCanvas3d.getScreen3D();
        Dimension dim = sOn.getSize();
        dim.width *= OFF_SCREEN_SCALE;
        dim.height *= OFF_SCREEN_SCALE;
        sOff.setSize(dim);
        sOff.setPhysicalScreenWidth(sOn.getPhysicalScreenWidth() *
                                    OFF_SCREEN_SCALE);
        sOff.setPhysicalScreenHeight(sOn.getPhysicalScreenHeight() *
                                         OFF_SCREEN_SCALE);
        // attach the offscreen canvas to the view
        u.getViewer().getView().addCanvas3D(offScreenCanvas3d);
        Point loc = c.getLocationOnScreen();
        offScreenCanvas3d.setOffScreenLocation(loc);
        dim = c.getSize();
        dim.width *= OFF_SCREEN_SCALE;
        dim.height *= OFF_SCREEN_SCALE;

        addBackgroundNode();

        //Background testBack = new Background(new
Color3f(1.0f,1.0f,1.0f));
        bImage = offScreenCanvas3d.doRender(dim.width, dim.height);

        removeBackgroundNode();
        u.getViewer().getView().removeCanvas3D(offScreenCanvas3d);
        offScreenCanvas3d = null;
        config = null;
        sOn = null;
        sOff = null;
        System.gc();
        System.runFinalization();
    }


oooooooooooooooooooooooooooooooooooooooooooooooo
Desiree Hilbring

Institut fuer Photogrammetrie und Fernerkundung
Universitaet Karlsruhe, Germany
email: [EMAIL PROTECTED]
# 0721 6083676
oooooooooooooooooooooooooooooooooooooooooooooooo

===========================================================================
To unsubscribe, send email to [EMAIL PROTECTED] and include in the body
of the message "signoff JAVA3D-INTEREST".  For general help, send email to
[EMAIL PROTECTED] and include in the body of the message "help".