    /*
     ************************************************************************
     *
     * Java 3D configuration file for 4 screen projection configuration
     * arranged in a 2x2 power wall.
     *
     ************************************************************************
     */

    // Create new screen objects and associate them with logical names and numbers.
    // These numbers are used as indices to retrieve the AWT GraphicsDevice from
    // the array that GraphicsEnvironment.getScreenDevices() returns.
    //
    // NOTE: The GraphicsDevice order in the array is specific to the local
    // site and display system.
    //
    (NewScreen topleft     0)
    (NewScreen topright    1)
    (NewScreen bottomleft  3)
    (NewScreen bottomright 2)

    // Set the available image areas for full screens.  This is important when
    // precise scaling between objects in the virtual world and their projections
    // into the physical world is desired through use of explicit ScreenScale view
    // attributes.  The defaults are 0.365 meters for width and 0.292 meters for
    // height.
    //
    (ScreenProperty topleft     PhysicalScreenWidth  0.912)
    (ScreenProperty topleft     PhysicalScreenHeight 0.680)

    (ScreenProperty topright    PhysicalScreenWidth  0.912)
    (ScreenProperty topright    PhysicalScreenHeight 0.680)

    (ScreenProperty bottomleft  PhysicalScreenWidth  0.912)
    (ScreenProperty bottomleft  PhysicalScreenHeight 0.685)

    (ScreenProperty bottomright PhysicalScreenWidth  0.912)
    (ScreenProperty bottomright PhysicalScreenHeight 0.685)

    // Specify full screen windows.
    //
    (ScreenProperty topleft     WindowSize NoBorderFullScreen)
    (ScreenProperty topright    WindowSize NoBorderFullScreen)
    (ScreenProperty bottomleft  WindowSize NoBorderFullScreen)
    (ScreenProperty bottomright WindowSize NoBorderFullScreen)

    // Set the TrackerBaseToImagePlate transforms for these screens.  This
    // transforms points in tracker base coordinates to each screen's image plate
    // coordinates, where the origin of the image plate is defined to be the lower
    // left corner of the screen with X increasing to the right, Y increasing to
    // the top, and Z increasing away from the screen.
    //
    // Without head or sensor tracking the tracker base is still needed as a point
    // of reference for describing the orientation and position of each screen to
    // the others.  The coexistence to tracker base transform is set to identity by
    // default, so the tracker base origin and orientation will also set the origin
    // and orientation of coexistence coordinates in the physical world.
    //
    // The tracker base and center of coexistence are set here to the center of the
    // 2x2 array with its basis vectors aligned to image plate coordinates.
    //
    (ScreenProperty topleft     TrackerBaseToImagePlate
                                 (Translate 0.912 0.000 0.0))
    (ScreenProperty topright    TrackerBaseToImagePlate
                                 (Translate 0.000 0.000 0.0))
    (ScreenProperty bottomleft  TrackerBaseToImagePlate
                                 (Translate 0.912 0.685 0.0))
    (ScreenProperty bottomright TrackerBaseToImagePlate
                                 (Translate 0.000 0.685 0.0))

    // Create a view using the defined screens.
    //
    (NewView      view0)
    (ViewProperty view0 Screen  topleft)
    (ViewProperty view0 Screen  topright)
    (ViewProperty view0 Screen  bottomleft)
    (ViewProperty view0 Screen  bottomright)

    // Set the screen scale.  This is scale factor from virtual to physical
    // coordinates.  The default policy of SCALE_SCREEN_SIZE doesn't work well here
    // since in the 2x2 arrangement the individual screens are too small.  The
    // explicit scale factor below assumes a normalized range of object coordinates
    // of [-1.0 .. +1.0].
    //
    (ViewProperty view0 ScreenScalePolicy       SCALE_EXPLICIT)
    (ViewProperty view0 ScreenScale             0.912)

    // Set the user eye position in the display environment.
    //
    (ViewProperty view0 CenterEyeInCoexistence  (0.0 0.0 1.0))