Awesome work, Sam. Chris Moody and Casey Stark have both shown an interest in the Grid Data Format. I think it would be very useful if we could start iterating on the format, figuring out where it has weak points, and see if we can shore it up. At that point it may be appropriate to start shopping it around outside this list, as well. I've invited a few parties that may be interested in such a discussion to join the list. In particular, the GDF will play very nicely with the deliberate_fields branch, where fields are more clearly defined and accessed with respect to units, derived fields, and what is in the data. Additionally, because GDF separates out particles by type, it is perhaps a good idea to use this as a starting place to discuss how we should access particles... I've asked around a little bit, and come up with four options: Option 1: data_object["dark_matter","position_x"] Option 2: data_object.particles["dark_matter"]["position_x"] Option 3: data_object.particles["dark_matter","position_x"] Option 4: data_object["dark_matter"]["position_x"] (implicit Option 5: ...something else?) and the response I got was definitely #2 as the favorite. What do people here think? Thanks again, Sam -- this is great. (And thanks to Chris Moody for the initial pass at the GDF reader!) -Matt On Wed, Sep 7, 2011 at 9:37 PM, Sam Skillman <samskillman@gmail.com> wrote:

Hi All, Today I did some work on the Grid Data Format aka gdf, described here: http://yt-project.org/gdf.txt I've been attempting to use this to convert an Athena dataset to gdf, then read that into yt.  As of right now, I am testing on a single uniform grid, and am able to load it, find the max of the fields, and do a few other things.  However, I can't seem to get slices/projections to work.  Anyways, I'm not sure how much time I'll have in the immediate short term to work on this, so if anyone wants to jump in that'd be awesome. I've pushed what I have to my fork of yt: https://samskillman@bitbucket.org/samskillman/yt Here is the test dataset: http://corvette.colorado.edu/~skillman/dload/gdf0001.h5 You should be able to do: yt load gdf0001.h5 As a warning, I haven't tested a bunch of stuff, so there may be stupid mistakes lurking around.  Feel free to email me or respond to this list if you have questions. Cheers, Sam

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