Check out Zarch on the Acorn Archimedes. https://www.youtube.com/watch?v=MNXypBxNGMo It's an awesome 3D game from 1987 (with truly awful sound). That was made 6 years before Second Reality, on a RISC-based computer. It's incredible.
When I saw that one I had never seen anything so smoothly animated before that demo in my life. I think my brief exposure to the demoscene spoiled me, because I now can't stand the slightest graphics hiccup in anything.