He means 3D units - and it's not such a silly question when you think about how the 3D environment is constructed. The answer though is really one of "what benefit do you get from a sphere being 50 ft. in width as opposed to 50 units?" (yes, I can have a question as an answer!). I say this because your two eyeballs can't quantify "feet" on the 2D display of your monitor anyway, you could never look at a 3D scene and say "oh yeah, that building must be at least 200 ft away".
So really - name the units whatever you like, call them parsecs or meters or whatever, it doesn't really matter and it won't effect your code
Cheers,
Rich
"Gentlemen, we are about to short-circuit the Universe!"
DB Team / Atari ST / DarkForge / Retro Gaming