[yt-users] Load in ASCII VTK

Tue May 31 10:43:32 PDT 2016

Hi Lukas,

If I were in your shoes, probably the first thing I would do is just use
python to change your ascii file into a binary file outside yt, then see
what happens when you try and load the binary version into yt.  If the
problem is just the file type that might be the easiest fix, and python
help pages make me think that changing your file from ascii to binary is
not super difficult.

Looking at my old Athena vtk files, there is a lot more info in the header
than you seem to have.  You may have to manually put equivalent lines in
the header, but it seems pretty doable.

It may end up that you should just edit yt, but in the short term it may be
easier to make the file format changes necessary to use the athena reader.
Figuring out what those changes are may also help when trying to update a
frontend reader.

Best,
Stephanie

--
Dr. Stephanie Tonnesen
Alvin E. Nashman Postdoctoral Fellow
Carnegie Observatories, Pasadena, CA
stonnes at gmail.com

On Sun, May 29, 2016 at 1:36 PM, Lukas Bystricky <lukasbystricky at gmail.com>
wrote:

> Thanks John for your quick response. I've attached a sample file VTK file
> that I have. This is from a finite difference simulation, so grids will
> always be uniform.
>
> I found the Athena source code for how they write their VTK files (
> http://www.astro.princeton.edu/~jstone/Athena/doxygen/html.with_source/output__vtk_8c_source.html)
> and it looks similar to mine, except that theirs is in binary and they use
> a different dataset structure.
>
> I'm an extremely new YT user (and I've never done any YT development), so
> I don't know how much help I'd be but if you'd like a hand developing a new
> frontend let me know.
>
> On Sun, May 29, 2016 at 4:08 PM, John ZuHone <jzuhone at gmail.com> wrote:
>
>> Hi Lukas,
>>
>> I think Nathan's point was that there are other people working on new
>> frontends currently, and they are smoothing over the instructions for how
>> to make a new one.
>>
>> Probably the best thing to do in the short run is to figure out how to
>> read your data in using the Athena frontend. If you have a sample dataset
>> you can post somewhere for us to try that would help.
>>
>> I nominally maintain the Athena frontend, but I don't have a ton of time
>> at the moment, so it sort of depends on how difficult it will be to make
>> the changes in terms of how long it will take. If you're up for giving it a
>> shot yourself I'm happy to give you pointers.
>>
>> Is this uniformly gridded data, or something else?
>>
>> Best,
>>
>> John
>>
>>
>> ================================
>> John ZuHone, Chandra/ACIS Operations
>> Harvard-Smithsonian Center for Astrophysics
>>
>> 60 Garden St., MS-67       (w) 617-496-1816
>> Cambridge, MA 02138.     (m) 781-708-5004
>>
>> john.zuhone at cfa.harvard.edu
>> http://hea-www.cfa.harvard.edu/~jzuhone
>> ================================
>>
>> On May 29, 2016, at 3:41 PM, Lukas Bystricky <lukasbystricky at gmail.com>
>> wrote:
>>
>> Hello all,
>>
>> This is a followup to my question here (
>> http://lists.spacepope.org/pipermail/yt-users-spacepope.org/2016-May/007830.html).
>> Apologies, but I can't seem to figure out how to reply since I was never
>> sent an e-mail for either my question or Nathan's response.
>>
>> I'm trying to load a legacy VTK file into YT (see format description
>> http://www.vtk.org/wp-content/uploads/2015/04/file-formats.pdf), but I
>> when I try:
>>
>> ds = yt.load("file.vtk")
>>
>> I get the error:
>>
>> traceback (most recent call last):
>> File "visualization.py", line 3, in <module>
>> ds = yt.load("file.vtk")
>> File "C:\Users\Dave\Anaconda2\lib\site-packages\yt\convenience.py", line 84, in load
>> return candidates[0](*args, **kwargs)
>> File
>> "C:\Users\Dave\Anaconda2\lib\site-packages\yt\frontends\athena\data_structures.py",
>> line 470, in __init__
>> Dataset.__init__(self, filename, dataset_type,
>> units_override=units_override)
>> File
>> "C:\Users\Dave\Anaconda2\lib\site-packages\yt\data_objects\static_output.py",
>> line 190, in __init__
>>     self._parse_parameter_file()
>>   File
>> "C:\Users\Dave\Anaconda2\lib\site-packages\yt\frontends\athena\data_structures.py",
>> line 528, in _parse_parameter_file
>>      self.domain_left_edge = grid['left_edge']
>> KeyError: 'left_edge'
>>
>>
>> Nathan Goldbaum pointed out is his answer that YT can read in VTK files from Athena. I looked into this and it seems like the difference between my file and Athena's files is that mine are ASCII while Athena's are binary. Is that right?
>>
>>
>> On another note, Nathan also pointed out there are people working on a frontend for the VTK format I'm using. Could I provide any help there?
>>
>>
>> Thanks again, and sorry for the double posting.
>>
>>
>> Lukas
>>
>>
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