Mailman 3 December 2014 - yt-users

Porting .ply files to Blender with colors?
by Jill P. Naiman Aug. 14, 2022

Aug. 14, 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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Units for camera.draw_line
by Sean Couch Dec. 29, 2014

Dec. 29, 2014

Hi yt-users, Newb question: I’m trying to draw a line on my volume render of some FLASH data using camera.draw_line but I’m getting an error. My guess is that it is something to do with units, but I can’t figure out how to fix what I’m doing. I’m assuming that draw_line using code units, which for FLASH should be cgs. Here is my code snippet: cam = ds.camera(c, L, W, N, transfer_function=tf, ds=ds, no_ghost=True, fields=field, log_fields=[False]) im = cam.snapshot() cam.draw_coordinate_vectors(im) cam.draw_domain(im) cam.draw_line(im, [2e8,0.,0.], [0.,2e8,0.]) And here is the error I get when I run it: Traceback (most recent call last): File "render_radv.py", line 53, in <module> cam.draw_line(im, [2e8,0.,0.], [0.,2e8,0.]) File "/work/00863/smc/yt-x86_64/src/yt-hg/yt/visualization/volume_rendering/camera.py", line 415, in draw_lin\ e dx0 = ((x0-self.origin)*self.orienter.unit_vectors[1]).sum() File "/work/00863/smc/yt-x86_64/src/yt-hg/yt/units/yt_array.py", line 716, in __rsub__ lo = sanitize_units_add(self, left_object, "subtraction") File "/work/00863/smc/yt-x86_64/src/yt-hg/yt/units/yt_array.py", line 134, in sanitize_units_add raise YTUnitOperationError(op_string, inp.units, dimensionless) yt.utilities.exceptions.YTUnitOperationError: The subtraction operator for YTArrays with units (code_length) an\ d (1) is not well defined. Any help or guidance would be much appreciated! Thanks, Sean ----------------------------------------------------------- Sean M. Couch Theoretical Astrophysics Including Relativity California Institute of Technology Mail Code 350-17 Pasadena, CA 91125 (626) 395-4282 www.tapir.caltech.edu/~smc <http://www.tapir.caltech.edu/~smc> _______________________________________________ yt-users mailing list yt-users(a)lists.spacepope.org http://lists.spacepope.org/listinfo.cgi/yt-users-spacepope.org

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Binned 2D Profile CellMassMsun
by Munier Azzam Salem Dec. 29, 2014

Dec. 29, 2014

Hi All, I'm forming 2D binned profiles and writing them to file using yt 2.6, and noticed two different CellMassMsun's are stored in the file: CellMassMsun and CellMassMsun_std. These two values tend to differ by over an order of magnitude (from a glance, it seems the latter is consistently larger). Any idea what's up here? cheers, Munier -- Munier A. Salem // 845.489.6450 _______________________________________________ yt-users mailing list yt-users(a)lists.spacepope.org http://lists.spacepope.org/listinfo.cgi/yt-users-spacepope.org

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units in derived field
by Desika Narayanan Dec. 28, 2014

Dec. 28, 2014

Hi All, When I access some derived fields (like StarFormationRate) in a galaxy simulation, the units are dimensionless: In [*4*]: ad = ds.all_data() In [*5*]: ad[("PartType0","StarFormationRate")] Out[*5*]: YTArray([ 0.00000000e+00, 0.00000000e+00, 8.29740111e-06, ..., 0.00000000e+00, 0.00000000e+00, 0.00000000e+00]) (dimensionless) I'd like to assign the units to this field. I figure I could define a field with the right units, but it seems like it might be possible to just assign units to the ds StarFormationRate field as is. Is this possible, or should I just define a new field? thanks, desika _______________________________________________ yt-users mailing list yt-users(a)lists.spacepope.org http://lists.spacepope.org/listinfo.cgi/yt-users-spacepope.org

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Field based on neighbour cells
by José Utreras Dec. 19, 2014

Dec. 19, 2014

Hi everyone, I want to write a new field based on the neighbour cells like this: vx = data[ftype, "velocity_x"][sl_right,sl_center,sl_center] but I got " global name 'ftype' is not defined". I suppose that I have the same problem with sl_left, sl_right , sl_center. Thanks, Jose _______________________________________________ yt-users mailing list yt-users(a)lists.spacepope.org http://lists.spacepope.org/listinfo.cgi/yt-users-spacepope.org

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clump as container
by David Collins Dec. 18, 2014

Dec. 18, 2014

Hi there-- I'm doing something wrong with clumps in yt3, and can't quite figure out what I"m doing. When I make some clumps, the field 'density' shows up, but no other fields seem to be well defined. Is this a familiar error to anyone? What I'm doing is the following: I make some clumps from a sphere, similar to what's in the docs (details at the end of the email), and when I do >>> leaf_clumps[n]['density'] I get something sensical. But if I do >>> leaf_clumps[n]['cell_mass'] YTArray([], dtype=float64) g I get this empty array. If I instead try quantities.total_mass(), I get an odd error. >>> leaf_clumps[22].quantities.total_mass() Traceback (most recent call last): File "<stdin>", line 1, in <module> File "/home/dcollins4096/local-yt-2014-08-27/src/yt-hg/yt/data_objects/derived_quantities.py", line 193, in __call__ rv = super(TotalMass, self).__call__(fields) File "/home/dcollins4096/local-yt-2014-08-27/src/yt-hg/yt/data_objects/derived_quantities.py", line 160, in __call__ rv = super(TotalQuantity, self).__call__(fields) File "/home/dcollins4096/local-yt-2014-08-27/src/yt-hg/yt/data_objects/derived_quantities.py", line 56, in __call__ sto.result = self.process_chunk(ds, *args, **kwargs) File "/home/dcollins4096/local-yt-2014-08-27/src/yt-hg/yt/data_objects/derived_quantities.py", line 166, in process_chunk for field in fields] File "/home/dcollins4096/local-yt-2014-08-27/src/yt-hg/yt/data_objects/data_containers.py", line 248, in __getitem__ self.get_data(f) File "/home/dcollins4096/local-yt-2014-08-27/src/yt-hg/yt/data_objects/selection_data_containers.py", line 749, in get_data raise YTMixedCutRegion(self.conditionals, field) yt.utilities.exceptions.YTMixedCutRegion: Can't mix particle/discrete and fluid/mesh conditions or quantities. Field: ('all', 'particle_mass') and Conditions specified: obj['contours_8d0408a91fc34e2bbe9eb838d48de46e'] == 1 I build the clumps in the following manner. I don't have any validators by design. Plotting the clumps with annotate_clumps(leaf_clumps) gives reasonable results. ds = yt.load(setname) loc = ds.arr([ 0.03613281, 0.79589844, 0.03027344], 'code_length') width = (0.05,'code_length') sphere = ds.sphere(loc,width) master_clump = Clump(sphere,"density") use_particles=False, use_thermal_energy=False) c_min = sphere["gas", "density"].min() c_max = sphere["gas", "density"].max() step = 2.0 find_clumps(master_clump, c_min, c_max, step) leaf_clumps = get_lowest_clumps(master_clump) Thanks a ton! d. -- -- Sent from a computer. _______________________________________________ yt-users mailing list yt-users(a)lists.spacepope.org http://lists.spacepope.org/listinfo.cgi/yt-users-spacepope.org

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Re: [yt-users] export_obj function for Blender3D
by Naiman, Jill Dec. 17, 2014

Dec. 17, 2014

Hi Kyriaki, On Wed, Dec 17, 2014 at 7:00 PM, Dionysopoulou K. < K.Dionysopoulou(a)soton.ac.uk> wrote: > > Hi Nathan and Jill, > > thanks for your very quick response. I will wait for the modifications to > the export_obj function then. > On another matter, how easy would it be to pass volume renderings to > sketchfab instead of the isosurfaces? What I have in mind is something > similar to this > > http://vimeo.com/104706172 > > but for uniform_grid data. This would be very useful when producing movies > of volume renderings. > > As far as I know, sketchfab only renders surfaces, while volume renderings would be a different rendering process in WebGL. It would be cool if they started though! > Thanks once again, > > Kyriaki Dionysopoulou > ======================================================= > Mathematical Sciences > University of Southampton > Southampton, SO17 1BJ, UK > K.Dionysopoulou(a)soton.ac.uk<mailto:K.Dionysopoulou@soton.ac.uk> > > On 17 Dec 2014, at 23:30, Nathan Goldbaum <nathan12343(a)gmail.com<mailto: > nathan12343(a)gmail.com>> wrote: > > > > On Wed Dec 17 2014 at 3:29:49 PM Naiman, Jill <jill.naiman(a)cfa.harvard.edu > <mailto:jill.naiman@cfa.harvard.edu>> wrote: > Hi Kyriaki, > > The export_obj needs to be updated, I've got a fixed copy I've been > meaning to push to the repository, so maybe I should just get on that! > > Other folks - let me know if someone should first file a bug report, or if > I should just fix & push. > > If you will get the fix out in the next couple of days, there's probably > no need to file an issue. If it will take a while, it's nice to have a bug > that we can reference if people ask questions about it in the future. > > > Cheers, > -Jill > > On Wed, Dec 17, 2014 at 6:01 PM, Dionysopoulou K. < > K.Dionysopoulou(a)soton.ac.uk<mailto:K.Dionysopoulou@soton.ac.uk>> wrote: > Dear all, > > I am trying to use the yt export_obj function in order to be able to use > yt in conjunction with Blender3D. I am very new to yt, so I tried the > simple example you have here: > > http://yt-project.org/doc/visualizing/sketchfab.html > > and here > > http://blog.yt-project.org<http://blog.yt-project.org/> > > My problem is that even when using the data suggested in the webpage the > code snippet provided fails to produce the mtl and obj files. After taking > a quick look at the code I noticed the initial problem was caused by > inconsistent units for the emissivity (maybe a typo in the docs?). I also > changed ‘mpc’ to ‘Mpc’ as yt was complaining that the domain was too small. > Even after these minor changes the export_obj function does not seem to > work for me. The error messages are attached in the python notebook below > (the notebook is basically just a copy and paste from the provided ones in > the websites above). > > The similar (but different) export_sketchfab function seems to work fine > for the same data. I cannot really figure out what goes wrong with the > export_obj function and any help would be very much appreciated. > > > > Thanks in advance, > > > Kyriaki Dionysopoulou > ======================================================= > Mathematical Sciences > University of Southampton > Southampton, SO17 1BJ, UK > K.Dionysopoulou(a)soton.ac.uk<mailto:K.Dionysopoulou@soton.ac.uk><mailto: > K.Dionysopoulou(a)soton.ac.uk<mailto:K.Dionysopoulou@soton.ac.uk>> > > > _______________________________________________ > yt-users mailing list > yt-users(a)lists.spacepope.org<mailto:yt-users@lists.spacepope.org> > http://lists.spacepope.org/listinfo.cgi/yt-users-spacepope.org > > _______________________________________________ > yt-users mailing list > yt-users(a)lists.spacepope.org<mailto:yt-users@lists.spacepope.org> > http://lists.spacepope.org/listinfo.cgi/yt-users-spacepope.org > > _______________________________________________ > yt-users mailing list > yt-users(a)lists.spacepope.org > http://lists.spacepope.org/listinfo.cgi/yt-users-spacepope.org > _______________________________________________ yt-users mailing list yt-users(a)lists.spacepope.org http://lists.spacepope.org/listinfo.cgi/yt-users-spacepope.org

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export_obj function for Blender3D
by Dionysopoulou K. Dec. 17, 2014

Dec. 17, 2014

Dear all, I am trying to use the yt export_obj function in order to be able to use yt in conjunction with Blender3D. I am very new to yt, so I tried the simple example you have here: http://yt-project.org/doc/visualizing/sketchfab.html and here http://blog.yt-project.org My problem is that even when using the data suggested in the webpage the code snippet provided fails to produce the mtl and obj files. After taking a quick look at the code I noticed the initial problem was caused by inconsistent units for the emissivity (maybe a typo in the docs?). I also changed ‘mpc’ to ‘Mpc’ as yt was complaining that the domain was too small. Even after these minor changes the export_obj function does not seem to work for me. The error messages are attached in the python notebook below (the notebook is basically just a copy and paste from the provided ones in the websites above). The similar (but different) export_sketchfab function seems to work fine for the same data. I cannot really figure out what goes wrong with the export_obj function and any help would be very much appreciated. Thanks in advance, Kyriaki Dionysopoulou ======================================================= Mathematical Sciences University of Southampton Southampton, SO17 1BJ, UK K.Dionysopoulou(a)soton.ac.uk<mailto:K.Dionysopoulou@soton.ac.uk> _______________________________________________ yt-users mailing list yt-users(a)lists.spacepope.org http://lists.spacepope.org/listinfo.cgi/yt-users-spacepope.org

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