This is a collection of 1128x832 ray-traced images.  Snail4 and Mirror are
my own compositions and the others are demos that accompanied the tracers.
Please don't deluge me with mail asking for the ray-tracers.  I have made
a few small modifications to them to allow them to live more comfortably in
the NeXT environment, and I will post them presently.  In the meantime,
uncompress these images, and view them with Scene or whatever tiff viewer
you like.  They are all 2 bits per pixel, so color voyeurs will be
disappointed, but they look pretty good to me.

The tracers used were:

	rayshade3.0 (patch level 5)  from   weedeater.yale.math.edu
        dkbtrace    (version 2.0)    from   cs.uoregon.edu

	(and a third proprietary tracer from the Ballistic Research Lab,
	 which runs under X-windows on my NeXT.  If you want it, ftp
	 to vgr.brl.mil and read the notes there.  DON'T send me mail
	 asking how to get it.)

	All of the tracers are more powerful than the Ray.app demo, have
	better scene description file formats and comparable speed.

Snail4 is my attempt to duplicate an image I once saw in a Scientific
American magazine.  It consists of overlapping spheres tracing
a logarithmic spiral (I tested the spiral shape using SpaceCurve in 
Mathematica), and with a radius proportional to the location on the curve.

Mirror4 is a mirrored room with a soap bubble in the corner, one marble wall,
and a spline surface in the center which I unfortunately had to render
with small polygons.  I would far prefer a tracer that handles B-spline
surfaces directly!  Anyone have one?  (The proprietary tracer actually
does do this, but its file format is a disaster).

Use these images in any way you want, except commercially.  Please distribute
with this README file intact.

I would like to hear from anyone who makes good ray-traced pictures and wishes
to exchange files, tracers, or images.  

Shane Artis

shanega@athena.mit.edu
