The demoscene legends from the group/collective Mercury released this glsl library for building signed distance functions. What is it? Well, SDFs (or more precise: signed distance bounds). Those are a very elegant and flexible representation of geometry that can be rendered or otherwise processed. Roughly, coded SDFs are to triangle meshes or voxels what vector graphics are to pixels. It's all super-geeky, and super awesome if you're into this stuff. :) To quote the authors: "This lib is the one that we used ourselves to make 64k intros like the timeless and on, straight from our version control system. Much of what we learned from those productions ended up in here."
dejavu