I'm making a physics simulator in C++. After I went to GDC 2012, I got excited to play with OpenGL again, so I decided to pick up on this project, which I'd read up a bit on last year but hadn't had the time to really sink my teeth into it. I have collision detection all worked out and now I just need to finish off the physics simulation itself. After that, all that remains is to clean up the code and make the it fun to actually play with.