[yt-users] updated examples for 3.0 volume rendering

[Michael Zingale]

On Fri, Mar 28, 2014 at 3:37 PM, Nathan Goldbaum <nathan12343 at gmail.com>wrote:

> Hi Mike,
>
> You've hit a bunch of big changes we've been making recently.  If you want
> to get back to the version of yt before we merged these big changes in,
> you'll need to update to the 'development' bookmark.  Right now you're on
> the 'experimental' bookmark.
>
>
Oh... lucky me.


>
> On Fri, Mar 28, 2014 at 12:10 PM, Michael Zingale <
> michael.zingale at stonybrook.edu> wrote:
>
>> Is there any updated examples for using the yt 3.0 volume rendering?
>>
>> For instance, looking at this:
>>
>>
>> http://yt-project.org/docs/dev/cookbook/simple_plots.html#simple-volume-rendering
>>
>
> We haven't finished updating the docs yet.  In-development docs (including
> some out-of-date information that we need to update) are available here:
> http://yt-project.org/docs/dev-3.0/
>
>
>>
>> The field name is no longer simply "Density", but now, for my data, I
>> need to use a tuple like:
>>
>> field =  ('boxlib', 'magvel')
>>
>
> We no longer have a 'Density' field, since this introduces ambiguities for
> Enzo data and to create a consistent naming scheme for fields.  The new
> name is 'density'. See:
> http://ytep.readthedocs.org/en/latest/YTEPs/YTEP-0003.html
>

thanks for the list.  Maestro has it's own fun with variables (two
definitions for temperature, several pressures, etc., magvel above is not
simply the vector magnitude of x_vel, y_vel, z_vel, etc), so I'll pay
attention to these definitions.




>
>> And then when I look at the extrema, I no longer take the [0] index, as
>> that just gives the min, but instead if I look at:
>>
>>
> That true, we've simplified the derived quantity API somewhat.  This fixes
> a long-standing issue at the cost of breaking some old user scripts.  As
> you can see we are planning to break backward compatibility somewhat for
> the final yt 3.0 release.
>
>
>> dd.quantities["Extrema"](field)
>>
>> I get:
>>
>> (124.858613718 dimensionless, 18061918.0546 dimensionless)
>>
>
>
>> (not sure why they are dimensionless, but that's a different problem).
>>
>>
> If you do
>
> type(dd.quantities["Extrema"](field)[0])
>
> you will see that it is a new type, YTQuantity, which is a new class we've
> defined to handle units for scalar data.  YTArray does the same thing for
> array data.  More detail here:
> http://yt-project.org/docs/dev-3.0/analyzing/units/index.html
>
> These are 'dimensionless' because the boxlib frontend does not know what
> the appropriate units are for the 'magvel' field.  It may be the case that
> we could modify the frontend to detect the units
>
>
>> Finally, if I try to make a transfer function, like:
>>
>> tf = ColorTransferFunction((mi, ma))
>>
>> I get:
>>
>> NameError: name 'ColorTransferFunction' is not defined
>>
>
> I think this was an oversight on Matt's part.  Thanks for the report!  For
> now you should be able to import ColorTransferFunction from
> yt.visualization.volume_rendering.api, but this should be fixed soon.
>
> The reason this happened is that we've changed the way imports work in the
> top-level yt namespace in the interest of yt behaving more like a 'normal'
> scientific python package.  More detail is available here:
>
> http://ytep.readthedocs.org/en/latest/YTEPs/YTEP-0019.html
>
> as well as in the following pull request:
>
> https://bitbucket.org/yt_analysis/yt/pull-request/729/ytep-0019/diff
>
>
>>
>> I just synced up with the development version today.
>>
>> Mike
>>
>>
>>
> We're working hard to update the docs and get the code into shape to
> release.  If you're ok with dealing with not having fully up-to-date docs,
> we'd really appreciate you trying out the changes to the code, letting us
> know what you think, and reporting any bugs you find.
>
>
yeah, I'm happy to keep playing with this version if it helps.  The reason
I updated today is because Matt told me that he had incorporated the
Maestro field info that I sent him.



>
>>
>> --
>> 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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>


-- 
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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