Can much be done with that? The page says the sdk is for making multiplayer mods, the access it's headers give to the descent 3 engine itself seem fairly limited.
I should get around to trying Descent 3. I bought it on GOG a while ago, but haven't installed it. If it supports analog axes from direct input then I can control it with my 6dof space pilot pro. 🙂
Descent 1 (from 1.4a patch) and 2 already supported the VR helmets of that time, so they should already have native support for stereo rendering and head tracking.