https://github.com/cbaggers/rtg-math.git
git clone 'https://github.com/cbaggers/rtg-math.git'
(ql:quickload :rtg-math)
This system provides a selection of the math routines most commonly needed for making realtime graphics in lisp.
Currently it is working but the api will be changed as needed. Also there is a lot of room for performance improvements (sb-cga is definitely doing a better job there)