[yt-users] OffAxisProjection axes problems

Nathan Goldbaum nathan12343 at gmail.com
Fri Jun 3 15:44:28 PDT 2016 

Is there any chance you can make a self-contained example using one of the
test datasets on yt-project.org/data? That will make it easier for one of
us to take a shot at figuring out what's going wrong. I usually use
"IsolatedGalaxy" - it has a disk in the center of the simulation box with
an angular momentum vector aligned with the z axis.

On Fri, Jun 3, 2016 at 5:10 PM, Stephanie Tonnesen <stonnes at gmail.com>
wrote:

> Right, I have my north vector, which I *think* is why my z-axis (Image y)
> looks correct.  Unfortunately I can't specify an east_vector.  I will keep
> playing and if I come up with something clever I will let ppl know.
>
> Thanks for thinking about this with me!
>
> Stephanie
>
>
>
>
>
> --
> Dr. Stephanie Tonnesen
> Alvin E. Nashman Postdoctoral Fellow
> Carnegie Observatories, Pasadena, CA
> stonnes at gmail.com
>
> On Fri, Jun 3, 2016 at 2:10 PM, Nathan Goldbaum <nathan12343 at gmail.com>
> wrote:
>
>>
>>
>> On Fri, Jun 3, 2016 at 4:08 PM, Stephanie Tonnesen <stonnes at gmail.com>
>> wrote:
>>
>>> Hi Nathan,
>>>
>>>
>>> So I tried two of your ideas, and don't get the last one.
>>>
>>> ds.coordinates.x_axis[1] = 0
>>>>     ds.coordinates.x_axis['y'] = 0
>>>>     ds.coordinates.y_axis[1] = 2
>>>>     ds.coordinates.y_axis['y'] = 2
>>>>
>>>
>>> Is the orientation correct (albeit with z along the horizontal axis and
>>> x along the vertical axis) if you don't do this ^ ?
>>>
>>> If I don't do that but still have the same L and north_vector, I get the
>>> same results.
>>>
>>> If I change L = [0,1,0] and north_vector=[0,0,1], I get the same results
>>> as well.
>>>
>>> Ugh!
>>>
>>> I am not sure what "x" and "z" fields you think I should be making
>>> OffAxisProjection s for?  Do you mean have L = [1,0,0] and [0,0,1], or have
>>> it project an "x" and "z" field onto my off-axis projection?
>>>
>>
>> 'x' and 'z' don't really have a meaning for OffAxisProjectionPlot, that's
>> why they're dispalyed as "image x" and "image y". However, if you specify a
>> north_vector, that should disambiguate things.
>>
>> It's entirely possible there's a bug here.
>>
>>
>>>
>>> Thanks,
>>>
>>> Stephanie
>>>
>>>
>>>
>>>
>>> --
>>> Dr. Stephanie Tonnesen
>>> Alvin E. Nashman Postdoctoral Fellow
>>> Carnegie Observatories, Pasadena, CA
>>> stonnes at gmail.com
>>>
>>> On Thu, Jun 2, 2016 at 5:14 PM, Nathan Goldbaum <nathan12343 at gmail.com>
>>> wrote:
>>>
>>>>
>>>>
>>>> On Thu, Jun 2, 2016 at 6:45 PM, Stephanie Tonnesen <stonnes at gmail.com>
>>>> wrote:
>>>>
>>>>> Hi all,
>>>>>
>>>>> The quick summary of what I want to do is switch the coordinates of
>>>>> the x-axis on a OffAxisProjection plot.  Basically, what I am trying to do
>>>>> is get a LOS look at a galaxy , so I need a 20 degree tilt in the y-z
>>>>> plane.  For some reason this is swapping the x-axis direction from my plain
>>>>> old y slice.  The relevant parts of my code look like this:
>>>>>
>>>>> ds.coordinates.x_axis[1] = 0
>>>>>     ds.coordinates.x_axis['y'] = 0
>>>>>     ds.coordinates.y_axis[1] = 2
>>>>>     ds.coordinates.y_axis['y'] = 2
>>>>>
>>>>
>>>> Is the orientation correct (albeit with z along the horizontal axis and
>>>> x along the vertical axis) if you don't do this ^ ?
>>>>
>>>> What happens if you make an off-axis projection aligned with the y
>>>> axis, i.e. L = [0, 1, 0], north_vector = [0, 0, 1]?
>>>>
>>>> Can you try making an off-axis projection of the 'x' and 'z' fields?
>>>>
>>>>
>>>>>
>>>>>     plot6=yt.SlicePlot(ds,"y","density")
>>>>>     plot6.save()
>>>>>
>>>>>     plot8=yt.SlicePlot(ds,"y","velocity_z")
>>>>>     plot8.save()
>>>>>
>>>>>     plot9 = yt.SlicePlot(ds,"y","velocity_y")
>>>>>     plot9.save()
>>>>>
>>>>>     plot10 = yt.SlicePlot(ds,"y","velocity_x")
>>>>>     plot10.save()
>>>>>
>>>>>     ds.periodicity=(True,True,True)
>>>>>
>>>>>     L = [0.0,0.93969,-0.342]
>>>>>     #W = [0.5,0.5,0.5]
>>>>>     #c = [0.5,0.5,0.5]
>>>>>     #N = 1028
>>>>>     north_vector = [0,0.342,0.93969]
>>>>>     plot12 =
>>>>> yt.OffAxisProjectionPlot(ds,L,'density',width=(100,'kpc'),north_vector=north_vector)
>>>>>     plot12.save()
>>>>>
>>>>>     plot13 =
>>>>> yt.OffAxisProjectionPlot(ds,L,'velocity_x',width=(100,'kpc'),north_vector=north_vector)
>>>>>     plot13.save()
>>>>>     plot14 =
>>>>> yt.OffAxisProjectionPlot(ds,L,'velocity_y',width=(100,'kpc'),north_vector=north_vector)
>>>>>     plot14.save()
>>>>>     plot15 =
>>>>> yt.OffAxisProjectionPlot(ds,L,'velocity_z',width=(100,'kpc'),north_vector=north_vector)
>>>>>     plot15.save()
>>>>>
>>>>> I have attached four files:  the slices of velocity_y and velocity_x
>>>>> and the OffAxisProjections of the same.  You can see that the x-axis seems
>>>>> to be flipped.  You will also notice that the OffAxisProjection is more
>>>>> zoomed than the Slice, but don't let this distract you :)
>>>>>
>>>>> I have no idea what has gone wrong here.  Any help, as always, is
>>>>> really appreciated.
>>>>>
>>>>> Thanks,
>>>>> Stephanie
>>>>> --
>>>>> Dr. Stephanie Tonnesen
>>>>> Alvin E. Nashman Postdoctoral Fellow
>>>>> Carnegie Observatories, Pasadena, CA
>>>>> stonnes at gmail.com
>>>>>
>>>>> _______________________________________________
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>>>>>
>>>>>
>>>>
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