I wrote this Ray Tracing program using GFA Basic. It was used to make the animation pictures for the CLYINDER- BOINK animation program.
Here is the floppy disk image for an Atari ST emulator such as STEEM. This disk image is in .STT format. Note if you use STEEM you can run the ray tracing part speeded up and create pictures in 1/10 of the time.
If you are able to transfer files to an Atari ST here are the files you can put on a floppy disk to run the program:
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