[Pierre-Marie Baty]

buoyancy is the resistance of an object to matter

gravity is the force that attracts things to earth

I simplify a lot but thats it ...

about modelling... yes, you could use Milkshape to compile... but you're not forced to, you can also compile your models using the command-line tools that are provided in the HL SDK, that's how I compiled my RACC player models that were included with the preview of the bot

(2) : what could perhaps be done then, would be to give the player a "fly/noclip" capability when in waypointing mode, and allow him to plot waypoints not where he IS, but where he POINTS AT. That, could be done.