There is a new version of the RTrace ray-tracing package (8.2.0) at
asterix.inescn.pt [192.35.246.17] in directory pub/RTrace.
Check the README file.

RTrace now can use the SUIT toolkit to have a nice user interface.
Compile it with -DSUIT or modify the Makefile.
SUIT is available at suit@uvacs.cs.virginia.edu
I have binaries of RTrace with SUIT for SUN Sparc, SGI Indigo
and DOS/GO32.
Please contact me if interested.

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The MAC RTrace 1.0 port is in directory pub/RTrace/Macintosh
Thanks to Reid Judd (reid.judd@east.sun.com) and
Greg Ferrar (gregt@function.mps.ohio-state.edu).

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Small changes were done since version 8.1.0, mainly:

1. Now it is possible to discard backface polygons and triangles
   for fast preview...

2. The support program scn2sff has been reworked to use temp files.

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Here goes a short description of current converters from
CAD/molecular/chemistry packages to the SCN format.

The package programs are related as below (those marked with * have been
modified)

	       irit2scn
     IRIT ----------------|
                          |               NFF (nffclean, nffp2pp)
	        sol2scn   |                |
    ACAD11 ---------------|                | nff2sff
                          |                |
	        mol2scn	  v    scn2sff*    v	rtrace*
   ALCHEMY  -----------> SCN -----------> SFF ----------> PIC or PPM
			  ^      cpp                           |
	        pdb2scn   |                                 picmix
     PDB -----------------|                                 picblend
			  |                                 ppmmix*
	       chem2scn   |                                 ppmblend*
   CHEMICAL --------------|
                          |
                3ds2scn*  |
  3D STUDIO --------------|
                          |
                iv2scn*   |
 IRIS Inventor -----------|

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The DOS port of RTrace is in pub/RTrace/PC-386 (rtrac820.arj,
utils820.arj and image820.arj). See the README file there.
Requires DJGPP GO32 DOS extender (version 1.09 included), which can be
found in directory pub/PC/djgpp (and in many sites around netland).
There are also demo scenes, manuals and all the source code...

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Please feel free to get it and use it.
Hope you like it.