This is a simple simulation of a system with n particles with a gravitational force attracting them. In order to reduce the computational cost of this, the Barnes-Hut-Tree method was used.

This was a one-weekend project, so some parts are rather unrefined.

To start real-time simulation enter:

./ngrav

If the frame rate is too low, you can precalculate the simulation to a file using

./ngrav -r

and render the result using

./ngrav -p FILE