The Alchemy Screen-Space Ambient Obscurance Algorithm

@inproceedings{mcguire2011alchemy,
  title={The alchemy screen-space ambient obscurance algorithm},
  author={McGuire, Morgan and Osman, Brian and Bukowski, Michael and Hennessy, Padraic},
  booktitle={Proceedings of the ACM SIGGRAPH Symposium on High Performance Graphics},
  pages={25--32},
  year={2011}
}