[yt-users] Volume render with two variables?

Scott Feister sfeister at gmail.com
Fri Jan 27 12:52:34 PST 2017


Thanks, Nathan.

I'll keep the yt-developers list posted if I I solve the issue and think it
can integrate back into yt.

-Scott


Scott Feister, Ph.D.
Postdoctoral Researcher, Flash Center for Computational Science
University of Chicago, Department of Astronomy and Astrophysics

On Fri, Jan 27, 2017 at 2:39 PM, Nathan Goldbaum <nathan12343 at gmail.com>
wrote:

> Hi Scott,
>
> Making it easier to do this has been a longstanding issue. If you'd be
> interested in doing code development along this front that would be very
> welcome.
>
> Right now the best place to start would be the
> MultiVariateTransferFunction:
>
> https://bitbucket.org/yt_analysis/yt/src/23d0e83400c92b26416052a26d8944
> 4bdd1de9ed/yt/visualization/volume_rendering/transfer_
> functions.py?at=yt&fileviewer=file-view-default#transfer_functions.py-240
>
> Right now this is only directly exposed to users for "isocontour" volume
> renderings (see the ColoTransferFunction subclass), but in principle it
> could be generalized to do what you're looking for (e.g. the brightness
> coming from density but the color coming from temperature). I think John
> Wise even used it for exactly this a long time ago, but to my knowledge no
> one has ever used it for this sort of thing beyond experimental use cases.
> Having a user-visible API for setting this sort of thing up would be really
> nice.
>
> Sorry that I don't have an immediately useful response, but I hope this
> proves helpful.
>
> -Nathan
>
> On Fri, Jan 27, 2017 at 2:23 PM Scott Feister <sfeister at gmail.com> wrote:
>
>> Hi everyone,
>>
>> Is there a simple way to do a volume rendering of two variables
>> simultaneously? For example, if I wanted to overplot both density and
>> temperature into a single volume rendering. My naive method would be to
>> define a new variable which is a weighted sum of the two variables, and
>> sculpt the transfer function to have different colors over the range. I'm
>> just asking if there's a better way built into YT.
>>
>> I've done a lot of searching through the documentation, but I can't find
>> a clear answer as to whether this is a built-in feature. I've seen examples
>> from a few years ago where both variables are rendered separately, and the
>> PNG files are combined. This ends up with both variables being
>> partially-transparent to the other variable; in my example, I'd prefer *not
>> *to see through a particularly high-temperature region. I've also seen
>> documentation on a "multi-variate transfer function", but that
>> documentation is pretty incomplete.
>>
>> Thanks in advance!
>>
>> Best,
>>
>> Scott
>>
>> Scott Feister, Ph.D.
>> Postdoctoral Researcher, Flash Center for Computational Science
>> University of Chicago, Department of Astronomy and Astrophysics
>> _______________________________________________
>> yt-users mailing list
>> yt-users at lists.spacepope.org
>> http://lists.spacepope.org/listinfo.cgi/yt-users-spacepope.org
>>
>
> _______________________________________________
> yt-users mailing list
> yt-users at lists.spacepope.org
> http://lists.spacepope.org/listinfo.cgi/yt-users-spacepope.org
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.spacepope.org/pipermail/yt-users-spacepope.org/attachments/20170127/5b98068f/attachment-0001.htm>


More information about the yt-users mailing list