I cheated and started a week early because I'm omega level busy and knew I wouldn't get anything done in just the amount of free time I had this week. Don't tell the police. D: But I'm definitely going to finish something that's vaguely gamelike so that's nice.
Here's a video I took when I was working on collision, I just thought it was cute how these balls were dancing with each other https://twitter.com/CHz16/stat...
Nice! Swarming/flocking behavior is a lot of fun to mess with. My main website http://beesbuzz.biz/ has a custom 403 error page that you might enjoy. :)
Oh definitely, physics and collision are way harder than people realize. Circle-circle is just about the easiest case possible and even then it's fraught with all sorts of unexpected things to worry about.
What I like to do is separate the physics out into three passes - setup, generate impulses, apply impulses. This way the order of interactions doesn't matter. And then the impulses themselves just act as if everything's an elastic rigid body.
