One more integration method..
Use a single state vector for the physics update
Add RK4 integrator. Try to correct the earth-moon system, with limited success... not sure if the calculation or the integration is the problem.
Fixed grav-grav calculation. Earth-Moon system now stable.
For now, implement a hacky SOI system so we can draw lunar orbits when we get them
Fix music, add compute and render position of Earth-Moon Lagrange Points.
Move render code to own class
WIP reorg of includes + platform functionality
Display in-game date and time using boost::date_time.
Tweaking trails
Split out physics
Make camera system
Move entity system to own class
Experiment: Render trail positions relative to current camera target. A bit of a hack, we really want to record the history of the whole system instead