My friend is preparing an astronomy lecture and asked me to produce a video 
of a saturn flyby, so I dusted of an old saturn I did, but I wasn't 
satisfied with the rings.

The original version used a spherical pattern and a colour_map to do the 
rings, but it looked flat and artificial.

Here is the latest version. The new version uses three images from Bjorn 
Jonsson's excellent website (http://www.mmedia.is/~bjj/) for the rings. The 
problem I had was that POV has no innate way of mapping an image_map 
radially onto a flat plane (ie the rings). I solved this by writing some 
functions that map a radial coordinate onto the linear image_map. The new 
rings show far more detail and look much more realistic. If anyone knows an 
easier way please tell me!

I have posted the source and image files into p.b.s-f

Now the animation is done, my friend has asked if I can do another of 
Jupiter!

Rarius

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