[yt-users] Projection of 2D cylindrical FLASH data

[Nathan Goldbaum]

On Thu, May 14, 2015 at 5:35 PM, Ken Shen <kenshen at astro.berkeley.edu>
wrote:

> I'm really sorry, I can't seem to explain this very clearly in words!
>
> I have 2D axisymmetric data.  Let's suppose that I map this to a 3D
> Cartesian dataset.  I'd like to make a 2D plot from this 3D data that
> consists of integrating the density along rays from the observer through
> the dataset onto a plane on the other side of the data.  Ideally, I'd like
> to do this with the observer at an arbitrary position with respect to the
> axes.
>
> I haven't done it, but it seems like this is built in to yt's
> functionality for 3D datasets.  But I haven't found how to do it for a 2D
> axisymmetric dataset.
>
>
In yt we would call this a volume rendering using rays that are aligned
with the cartesian axes and a projection transfer function.

I don't think this has been implemented yet, but volume renderings of data
with non-cartesian geometries or with unstructured meshes is something we
would like to do.


>
> Sorry for all the messages!
> Ken
>
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> On Thu, May 14, 2015 at 5:28 PM, Michael Zingale <
> michael.zingale at stonybrook.edu> wrote:
>
>> to be clear here, what Flash calls cylindrical is 2-d axisymmetric, r-z.
>> If I understand what you are asking, you basically want to still have a 2-d
>> plot where each cell is the integral over an annular region as if that cell
>> were rotated about the symmetry axis -- is that right?
>>
>> On Thu, May 14, 2015 at 8:21 PM, Ken Shen <kenshen at astro.berkeley.edu>
>> wrote:
>>
>>> Hi, sorry I wasn't very clear before.  I'd like to make 2D column
>>> density plots of my 2D cylindrical data as if my data were 3D cylindrical
>>> data with no phi-dependence.
>>>
>>> (The ProjectionPlot fails for axis = 1 or 3.  For axis = 2, it
>>> essentially recreates the regular density slice plot.)
>>>
>>>
>>> Thanks,
>>> Ken
>>>
>>>
>>>
>>>
>>> On Thu, May 14, 2015 at 5:00 PM, Matthew Turk <matthewturk at gmail.com>
>>> wrote:
>>>
>>>> Hi Ken,
>>>>
>>>> (I think Suoqing's answer may work as well.)  If you want to project
>>>> along r, z, or theta, you can do a ProjectionPlot (or "ds.proj") and
>>>> specify "r", "z", or "theta", and the result will be along that axis
>>>> with the correct path lengths.  I think that the "r" direction may be
>>>> what you're looking for here, i.e., a soup-can label.
>>>>
>>>> -Matt
>>>>
>>>> On Thu, May 14, 2015 at 6:31 PM, Ken Shen <kenshen at astro.berkeley.edu>
>>>> wrote:
>>>> > Hi all, I'd like to make column density plots of my 2D cylindrical
>>>> FLASH
>>>> > data.  Ideally, these would be at arbitrary angles to the z-axis.
>>>> I'm new
>>>> > to yt, so I could very well have missed it, but I couldn't seem to
>>>> find this
>>>> > in the documentation.  Any hints?
>>>> >
>>>> >
>>>> > Thanks,
>>>> > Ken
>>>> >
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>>
>>
>> --
>> Michael Zingale
>> Associate Professor
>>
>> Dept. of Physics & Astronomy • Stony Brook University • Stony Brook, NY
>> 11794-3800
>> *phone*:  631-632-8225
>> *e-mail*: Michael.Zingale at stonybrook.edu
>> *web*: http://www.astro.sunysb.edu/mzingale
>>
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