Just out of curiosity, I went to try out the free Marathon release using the open-source Aleph One codebase on Steam. Among the other updates, it looks like the Aleph One guys updated the physics and graphics stuff to support unlimited framerate, so it’s pretty smooth. That being said, the in-game enemies and such are still sprites and still at their original resolution. I wonder if it’s possible to use AI-driven interframe interpolation, tweening to get smoother animations. I’m not sure that there’s enough data there, unfortunately.