RADARRRRR

Today I added radaring, with cached positions so it updates slower than realtime. The circles are all drawn with GL_LINE_STRIP using a sin, cos lookup table, and I'm using FSAA which makes them look amazingly better.

I'd like the update the target system so it's really easy to follow a single object. I intentionally kept the radar entirely 2 dimensional with no information about height because that extra information makes the entire display much harder to read.