I was doing 3d graphics contract work for Acorn in the mid nineties, for their RiscPC. I was given an early version of Taos to try - it was so early in development as to be essentially unusable, but it definitely existed!
I still use my RiscPC on a weekly (and sometimes daily) basis. It would have been fun to have a Risc iX or Galileo core (or some other technology not bound to the BBC Micro way of doing things) that retained the usability and snappiness of the Desktop.
What kind of 3D work were you doing?
Edit: It was Acorn User (not The Micro User) which featured the write-up on Taos, in 1995. A link to the article can be found on the Wikipedia page for 'Virtual Processor'.
Link to the Wikipedia page for Virtual Processor here: https://en.m.wikipedia.org/wiki/Virtual_Processor
But can you say what 3D work you were doing with a Risc PC? I remember Top Model and so on, but not having floating point was bad enough when others had graphics accelerators.
Subsequently I wrote a sample implementation of the Xerox Rooms paradigm for Acorn. It was a 3D office environment, with clickable destinations that would "teleport you" into new spaces. I'm not sure what became of this though tbh.
Next they wanted me to write a version of SGI's GL API for RiscOS, however - for whatever reason that project never really got started, so I had to go and get a proper job! :-(
Cheers
A GL implementation for RiscOS in 1995 (presumably as a RM?) would have been curious. My recollection of the Acorn Worlds was that a huge proportion of Acorn staff seemed more interested in running NetBSD than RiscOS itself, and I couldn't help thinking they knew something we didn't.