Re: [JAVA3D] View Model setup

[Rochelle O'Hagan]

Michael,

I'll try to give a more detailed description of the problem.

The Barco Baron is basically a large display screen (1.36m wide by 1.1m
high) (see www.barco-usa.com).  The user stands in front of the
display.  A pair of cameras tracks his/her hand and produces it's
physical world 3D location.  I want to display virtual objects at the
same location.  I think I have worked out the transform into virtual
world coordinates (the resulting values seem logical) but the view seems
to be set up wrong so that the volume of space where I can see objects
is too small.  I have played around with various different setups for
the view model.

Below is an example of my code.

    private SimpleUniverse universe = null;
    private Bounds bounds = new BoundingSphere(new Point3d(),
Double.MAX_VALUE);
    private final double BARCO_HEIGHT = 1.1; // 1.281;
    private final double BARCO_WIDTH = 1.36; // 1.58;

    private void initView() {
        // ViewPlatform settings
        universe.getViewingPlatform().getViewPlatform().
            setViewAttachPolicy(View.NOMINAL_SCREEN);

        // View settings
        universe.getViewer().getView().setTrackingEnable(false);
        universe.getViewer().getView().setUserHeadToVworldEnable(true);
        universe.getViewer().getView().setViewPolicy(View.SCREEN_VIEW);
        universe.getViewer().getView().
            setProjectionPolicy(View.PERSPECTIVE_PROJECTION);
        universe.getViewer().getView().
            setScreenScalePolicy(View.SCALE_EXPLICIT);
        universe.getViewer().getView().
            setWindowResizePolicy(View.VIRTUAL_WORLD);
        universe.getViewer().getView().
            setWindowMovementPolicy(View.VIRTUAL_WORLD);
        universe.getViewer().getView().
            setWindowEyepointPolicy(View.RELATIVE_TO_SCREEN);
universe.getViewer().getView().setCoexistenceCenteringEnable(true);

        // PhysicalEnvironment settings
                universe.getViewer().getPhysicalEnvironment().
                    setCoexistenceCenterInPworldPolicy(View.NOMINAL_SCREEN);

universe.getViewer().getPhysicalBody().setNominalEyeOffsetFromNominalScreen(2.0);

        universe.getCanvas().setStereoEnable(true);
        universe.getCanvas().setLeftManualEyeInImagePlate(new Point3d(0.647,
0.55, 2.0));
        universe.getCanvas().setRightManualEyeInImagePlate(new Point3d(0.713,
0.55, 2.0));

        // Screen3D settings
        universe.getCanvas().getScreen3D().
            setPhysicalScreenHeight(BARCO_HEIGHT);
        universe.getCanvas().getScreen3D().
            setPhysicalScreenWidth(BARCO_WIDTH);
    }

Then create a sphere & transform it to the location of the hand
        double[] points = socket_listener.getPoints();
        if (points.length % 3 == 0 && points.length >= 3) {
            Point3d p = new Point3d(points[0], points[1], points[2]);
            System.err.println("Camera coords : " + p);
            p.scale(0.001);

            Transform3D imageToVworld = new Transform3D();
            canvas.getImagePlateToVworld(imageToVworld);

            Point3d p1 = new Point3d(p);
            cameraToImagePlate.transform(p1);
            System.err.println("camera coords in image plate coord system");
            System.err.println(p1);
            imageToVworld.transform(p1);
            System.err.println("camera coords in virtual world coord system");
            System.err.println(p1);

            t3d.setTranslation(new Vector3d(p1));
            System.err.println("Sphere transform : " + t3d);
            transformGroup.setTransform(t3d);
        }

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