WELCOME TO THE MULTI-DIMENSIONAL
              DATA VISUALIZATION DEMO


This demonstration shows how you can visualize
data in four or more dimensions using surface
plotting, color, and animation. The demo displays
an animation consisting of 20 surfaces representing
a vibrating membrane. By default, the animation
represents a four-dimensional data set; the X, 
Y, Z, and time dimensions are displayed. 

You can add a fifth dimension using color. Select
"5 Dimensions" from the "Vertex Colors" sub-menu
of the Options menu to represent a quantity that
changes with time but which is not dependent on
location.

You can rotate the surface by positioning the mouse
in the draw widget, holding down the left mouse button,
and dragging the mouse.


MENU OPTIONS
------------

File Menu:
    Select "Quit" to exit the demonstration.

Options Menu:
    Select "Style" to choose between a wire-frame
    or a solid surface.

    Select "Shading" to choose between flat or Gouraud
    shading for the surface.

    Select "Drag Quality" to change the display quality
    when you are rotating the surface. A lower drag
    quality setting will generally provide faster 
    performance.

    Select "Vertex Colors" to change the way color is
    used in displaying the surface. The "Monochrome"
    option will display the surface in a single color.
    The "4 Dimensions" option will display the surface
    with color representing the Z value of the data.
    The "5 Dimensions" option will display the surface
    with color representing an independent variable.

About Menu:
    Select "About Vibrating Membrane" to display this
    help text.


FEATURES OF THE VIBRATING MEMBRANE DEMO
---------------------------------------

    The following graphical user interface elements
    allow you to control the demo.

    <<Triangle pointing to the left >>
        Click this button to play the animation
	backwards.

    <<Solid square >>
        Click this button to stop the animation.

    <<Triangle pointing to the right >>
        Click this button to play the animation 
	forwards.

   <<Left and right arrows >>
        Click this button to cause the animation to
	reverse direction when it reaches the end or
	beginning.

   <<Speed slider >>
        Adjust this slider to select a faster or slower
	rate of display.

   <<Frame slider >>
        Adjust this slider to display a particular frame.
	The slider is only available if the "Active Slider"
	checkbox is checked.

   <<Active Slider checkbox>>
        Click this checkbox to select a particular frame
	or to show the current frame number when the animation
	is in progress.

   <<Reset button>>
         Click this button to reset the surface to initial
	 orientation and frame index.