[yt-dev] Request for review: SDF

Hi all, The SDF pull request that Sam, Mike and I have been working on for a while is now ready for review: https://bitbucket.org/yt_analysis/yt/pull-request/955/wip-sdf-frontend-and-d... The paper we put out that uses this and uses examples from it is here: http://arxiv.org/abs/1407.2600 (and you can see Sam use it right around here: http://youtu.be/ln4nE_EVDCg?t=19m47s ). It would be really great to get feedback and figure out what is necessary for this to go in. Thanks, -Matt