Mailman 3 March 2019 - yt-users

Porting .ply files to Blender with colors?
by Jill P. Naiman Aug. 15, 2022

Aug. 15, 2022

Hi All, I was curious if anyone has had any luck porting .ply files generated with yt into Blender with colors? It seems to port in the surfaces just fine, but they are a uniform color. From what I can gather, Blender imports .ply files with face color instead of vertex so I tried the surf.export_ply routine with "face" instead of "vertex" for sample_type, but no luck ("vertex" doesn't work either). Let me know if I can provide any more useful info. Thanks for any help, -J

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Stars on volume rendering
by Elizabeth Harper-Clark Dec. 11, 2021

Dec. 11, 2021

Hi all, Thanks for all your help over the last couple of days. One more question: - Can I plot particles on a volume rendered image? I have stars and I want to show where they are! Thanks, Libby -- Elizabeth Harper-Clark MA MSci PhD Candidate, Canadian Institute for Theoretical Astrophysics, UofT Sciences and Engineering Coordinator, Teaching Assistants' Training Program, UofT www.astro.utoronto.ca/~h-clark <http://www.astro.utoronto.ca/%7Eh-clark> h-clark(a)cita.utoronto.ca Astronomy office phone: +1-416-978-5759

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Variance in phase/profiles
by david collins April 11, 2020

April 11, 2020

Hi, Everybody! Does anyone out there have a technique for getting the variance out of a profile object? A profile object is good at getting <X> vs. B, I'd then like to get < (X - <X>)^2 > vs B. Matt and I had spittballed the possibility some time ago, but I was wondering if anyone out there had successfully done it. Thanks, d. -- Sent from my computer.

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3-D Mass power spectra
by 梁家豪 June 3, 2019

June 3, 2019

Dear yt Can current yt calculate 3-D Mass power spectra? I checked the website but I didn't find any information. I think calculating 3-D Mass power spectra is a very useful for cosmological simulations. So I guess maybe yt supports this function now....? Thanks in advance

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Quick clump question
by Stephanie Tonnesen March 27, 2019

March 27, 2019

Hi yt-users, This is actually a bit directed at the developers of the clump finder. I would like to know if including a validator speeds up the clump finder routine. Basically, if I say via validator that I only want clumps whose minimum temperature is below some value, will that help me speed things up by tossing out clumps that don’t fulfill that criteria early on in the process? Or does it only validate after having gone through the entire clump finding routine (after it has looked for children a bunch of times and reached the max density or variable value)? Thanks! Stephanie -- -- Dr. Stephanie Tonnesen Associate Research Scientist CCA, Flatiron Institute New York, NY stonnes(a)gmail.com

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Changing units in image creation
by Andrew Cook March 24, 2019

March 24, 2019

Hello, I'm looking at changing the units for my density field from g/cm^2 to solar masses/pc^3. I tried using set_unit but that gave me an error saying it couldn't change from one to the other. I'm using Enzo 2.5 and yt 3.5.0 for visualisation. Many thanks Andy

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halos and particles question
by Dave Semeraro March 21, 2019

March 21, 2019

Hi there, I was wondering what is the correct way to obtain a list of particles that lie inside each halo in a catalog. I think I can figure out how to brute force this but I was wondering if there was a YT way to do it. In the end I would like particle positions (x,y,z) for particles grouped by which halo they are in. <disclaimer> I am not an astrophysicist and did not stay in a holiday inn express last night. I don’t even know what a halo is really for. I just need to get disjoint sets of particles that are grouped together for some work I am doing with tessellation. </disclaimer> I was thinking halos calculate a position and center for clumps of particles. I would like separate lists of particle positions for each of those clumps. So far I can generate the halos (cut and paste from the docs). I just don’t know the next step. I am working with the enzo_cosmology_plus dataset as an example. Thanks, Dave Semeraro Visualization Group Texas Advanced Computing Center University of Texas Austin

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yt halo finding
by Salome Mtchedlidze March 20, 2019

March 20, 2019

Hello, I am trying to become familiar with yt halo finding. I have already created halo catalog and with Jupiter notebook I could see what was the number of halos (when it creates halo catalog it also writes what is the number of halos). I am trying to plot number of halos dependence on their masses and for this I need to have number of halos (with certain masses) as an output. I was trying to use callbacks and quantities but failed. Do you know what will be the best solution to get number of halos as an output? Thanks, Salome

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Create_profile error with yt 3.5
by Lu, Yinghe March 19, 2019

March 19, 2019

Hello, I recently updated yt from 3.2.1 to 3.5.1 and I am receiving Segmentation Fault error when running yt.data_objects.profiles.create_profile. A good way to reproduce the error would be when running the test code in the documentation radial_profiles_styles.py. I can't seem to find anywhere in the documentation what has changed regarding this function during the updates. Would appreciate if anyone can take a look into this!

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Removing a source from a scene and keyname references
by Steiner, Andrew (Andrew W. Steiner) March 18, 2019

March 18, 2019

Hello all, What I'm trying to figure out is the best way to remove a source from a scene, if possible doing it by keyname (or is there some other unique identifier?). I know that the scene add_source method has a keyword argument for add_source, but there isn't a remove_source function yet. I can directly access 'sources' in the scene object, but I haven't yet figured out a good way to manipulate that. I have a few volume, line, and point sources, but I would like to remove some of them and add them back in as I rotate my camera. Take care, Andrew -- Andrew W. Steiner Joint Faculty Asst. Prof. at UTK/ORNL https://neutronstars.utk.edu/

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