gravity and buoyancy

Well, I got gravity and buoyancy working with Paul's help. I wrote up the calculations and sent them to Tarynn to see if they are right. Here are some results of tests that she asked me to run:

(a) no gravity means everyone should just float upwards
they head up to the top first, slam into the ceiling, and start bouncing back and forth between the ceiling and the floor.

(b) no buoyancy, no velocity, and everyone should sink
they head down to the bottom first, slam into the floor, and start bouncing back and forth between the ceiling and the floor.

(c) no velocity, gravity equals buoyancy and nobody should move
setting the density of the fluid equal to that of the parasite, gravity equals buoyancy and nothing moves.


So, major progress. Still lots to do though.