Reflection Demo
---------------
An illustration of one approach to rendering reflections in real time. To
reflect scene S in object O place a camera at O pointing at S. Use this
camera to render into an off screen pixelmap and then use this pixelmap
as an environment map with which to render O.

To invoke the demo type: rdemo.

Mouse & Keyboard Controls:

Depress

Left button: Move system in the XY plane.
Right button: Rolling ball motion.
Left & Right buttons: Zoom in/out in the Z plane. 

Depress 'T' to switch to a mode where mouse movements rotate only the
teapot. Depress 'T' again to return to the previous mode.

Depress 'E' to toggle between earth textures.
Depress 'M' to toggle between moon textures.
Depress 'Q' to quit from the demo.
