Hi Cameron, I believe the following three fields should be available to convert star particle data to baryon data: star_density_pyx star_metallicity_fraction star_creation_time star_dynamical_time All of these take the star particles, selected by "creation_time > 0" (about which I have conflicted feelings) and deposit either their masses or their respective quantities into the grid cells. My understanding is that where there is no data, the baryon field is set to zero. These fields can then be projected, plotted, etc. This is done via Cloud in Cell interpolation, through a transliteration (F->C) of the Enzo routine written by Britton Smith. For a while we had the original Fortran routine directly called, but fortran/c linkage proved to be a bit of a problem, so this is now a Cython/C routine. The longer term solution, which you alluded to above, for depositing particles will be something like this, where we have a finely-spaced mesh onto which particles are deposited and then overplotted, rather than a set of points. One interesting thing we could try would be semi-translucent images; one could imagine compositing a deposited particle field on top of a fixed resolution buffer. Anyway, just something to think about. Good luck, and I hope this helps! Let us know if it doesn't. -Matt On Tue, Jun 1, 2010 at 10:06 PM, Cameron Hummels <chummels@astro.columbia.edu> wrote:

Hello everyone:

  I would like to make some images of the stellar (or DM) particles for some of my enzo halos.  YT's current abilities for overplotting particle data on the grid gas data leaves something to be desired (although a long-term solution is being coordinated), so I was looking for an alternative.  Matt mentioned that some of you have circumvented this very problem by depositing particles into nearby grid cells and then using YT's excellent rendering abilities to produce some knockout images.  Does anyone have any suggestions on how one might go about generating such an image for, say, star particles?  Thanks!

Cameron

-- Cameron Hummels PhD Candidate, Astronomy Department of Columbia University Public Outreach Director, Astronomy Department of Columbia University NASA IYA New York State Student Ambassador http://outreach.astro.columbia.edu

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