yt-users May 2017

yt-users@python.org

23 participants
28 discussions

Porting .ply files to Blender with colors?
by Jill P. Naiman 14 Aug '22

14 Aug '22

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 11 Dec '21

11 Dec '21

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 11 Apr '20

11 Apr '20

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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[YT-USERS] Incoherence when ploting a slice - from FLASH simulation
by Gabriel RIGON 15 Jul '17

15 Jul '17

Dear all, I recently start to work with yt to analyze my FLASH simulation. The output of those simulation is an hdf5 file. When I try to plot a slice of my simulation, some weird lines appear on it. Here is an example of the python script and the results it leads to. """ import yt ds = yt.load("lasslab_hdf5_plt_cnt_0000.hdf5") yt.SlicePlot(ds, 'z', "dens").show() [cid:972219b9-edbb-4265-81cf-9a07e61cf360] """ Actually they also appear went plotting the results of a frb of a slice (even when I try to plot the x or y coordinate in 2d). Do you have any idea of the reason for such lines, or a solution for my problem? Best regards, Gabriel Rigon

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yt for analyzing Millennium simulation data
by Ankit Singh 14 Jun '17

14 Jun '17

Hi all, For some work, I had to use Millenium Simulation data. I have a catalog of halos with their positions, and I wanted to get the halos in voids. Can yt be of any use for such an analysis? The thing that makes it difficult is periodic boundary conditions it doesn't allow you to use KDtree straight away. Please help, Thanks, With Regards, Ankit

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Covering GIZMO data to uniform grid
by 梁家豪 31 May '17

31 May '17

Hello yt-commuinty, I was trying to use yt to analyse GIZMO data. Is there a function which can translate GIZMO gas data,particle0, to uniform grid with neutral hydrogen,velocity,temperature.etc? I know the "deposit " field and covering_grid in yt, but "deposit" isn't uniform and covering_grid is designed for grid-like data.. Thank you! Edward

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reading the fields correctly (ramses-rt)
by sacielo 31 May '17

31 May '17

Hi all, I'm experiencing a little trouble in reading some RAMSES files which include radiative transfer. In this (broadly used) implementation some of the fields do not follow the order they have classical RAMSES files; e.g. the pressure field is later in the fields list. Indeed when I read the files those fields do not have the correct content. Can someone please suggest a possible workaround? For instance a plugin for this kind of files, if it exists, or suggest how I could swap the fields, or rename them with the correct name? I do not want simply to create new fields, without correcting the default ones, as all derived fields (and possibly other valuable yt features) would not work properly. Thank you very much! Best, Salvatore

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2-D radial profile plotting
by Joshua Wall 30 May '17

30 May '17

Hello Dear Users, I'm recently trying to recreate some of the interesting 2-D radial plots of stellar and gas surface density the ALMA folks are making (see https://arxiv.org/abs/1703.07029 for instance) using my simulations. I've been experimenting with using an FRB to do this, but I'm having trouble resolving the innermost cells even though the FRB resolution matches my grid's highest resolution. I see that there was some discussion of including this in the code a couple of years ago (as well as where I got the idea to try FRBs for this): http://lists.spacepope.org/pipermail/yt-users-spacepope.org/2015-June/00620… Did this ever make it in? I'd love to be able to use it if so. Cordially, Josh -- Joshua Wall Doctoral Candidate Department of Physics Drexel University 3141 Chestnut Street Philadelphia, PA 19104

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producing smooth sliceplots instead of pixelated sliceplot images
by tazkera haque 30 May '17

30 May '17

Hi People, I was wondering if yt can produce smooth images of zoomed-in sliceplots, where the pixelated AMR grids are not clearly visible. I was interested to see the colors get mixed in smoothly (something like tetrahedralization), is that possible anyway in yt? Best Tazkera

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transparency and color from two arrays (cont.)
by Matěj Týč 30 May '17

30 May '17

Hello guys, our research group would like to visualize volume data, where the transfer function is bivariate (see http://lists.spacepope.org/pipermail/yt-users-spacepope.org/2017-April/0085… ). We have been struggling with this task, so I would like you to help me understand some of the basic concepts I have come across and that I find confusing. 1. I think that I somehow understand the concept of transfer functions with multiple fields, but I have difficulties of creating a volume source with multiple fields. I have somehow examined the source code, and it seems to me that only the first field is used (judging by https://github.com/yt-project/yt/blob/master/yt/visualization/volume_render… ). If I am wrong and it is meaningful and possible to construct a source with multiple fields, could you please provide an example? 2. I have no doubts that transfer functions work, but I was unable to find out how are they involved in the integration process. What I came across were the integration routines and they have mentioned that the transfer function is not used: https://github.com/yt-project/yt/blob/master/yt/utilities/lib/ray_integrato… . This is really interesting, how is it in reality? 3. You have mentioned the PlanckTransferFunction as a good example of multivariate transfer function. However, doing a Google search, hoping that we will find a code snippet featuring a non-trivial example did not yield any results. Would you be so kind and provide one? Best regards, Matej https://github.com/matejak

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yt-users May 2017