[yt-users] Volume Renderings

[John Wise]

Thanks.  The "RedBlue" movie shows the radiative feedback during the main sequence, and then the ensuing supernova.

I've used VisIt before for multi-variable volume renderings but was never happy with the results.  But seeing the quality (i.e. sharpness) of the density volume renderings makes yt a good candidate on reproducing these renderings.

John

On 5 Feb 2010, at 21:25, gso at physics.ucsd.edu wrote:

> Nice looking movies, are we looking at star forming or blowing up?:-)
> Been using VisIt to do rendering, need to learn a new toy to play with now
> heh
> 
> From
> G.S.
> 
>> Hi Matt,
>> 
>> Great news.  I can cook up a multi-variable transfer function over the
>> weekend and send it over.  Anyways I'm trapped in with the 2 feet of snow
>> falling tonight and tomorrow!
>> 
>> John
>> 
>> On 5 Feb 2010, at 20:02, Matthew Turk wrote:
>> 
>>> Hi John,
>>> 
>>> Thanks for your kind words -- and as for the rho & T, it's
>>> *definitely* possible.  I'd put work on the backend on hold for a
>>> while, but this has always been in my head -- I think it's very
>>> important to have multi-variate transfer functions.  Actually, if you
>>> have a multiple variable transfer function in mind you could hand off
>>> to me, I'd be eager to give a go at extending the machinery to support
>>> multiple variables!
>>> 
>>> As a side note, those movies are absolutely gorgeous.  I'm honored to
>>> even hear you broach the subject.
>>> 
>>> -Matt
>>> 
>>> On Fri, Feb 5, 2010 at 4:58 PM, John Wise <jwise at astro.princeton.edu>
>>> wrote:
>>>> Wow, awesome work, both of you!  I enjoyed your other renderings on
>>>> your
>>>> website, too.  And thanks for sharing your parallel script!
>>>> I looked through the ray tracing code, and saw that it could only
>>>> supports
>>>> one field.  Would it be easy to support separate fields for opacity and
>>>> color?  i.e. density for opacity and temperature for color.  Then we
>>>> can
>>>> re-create those "photo-realistic" renderings ...
>>>> http://www.astro.princeton.edu/~jwise/movies/FirstStarLighting_CLASSIC_HD_MONO720.mov
>>>> http://www.astro.princeton.edu/~jwise/movies/FirstStarLighting_RedBlue_MONO_HD720.mov
>>>> with yt!
>>>> Cheers,
>>>> John
>>>> On 5 Feb 2010, at 19:27, Sam Skillman wrote:
>>>> 
>>>> Hi all,
>>>> Matt asked me to share some recent volume renderings that I've made,
>>>> along
>>>> with the scripts to go with them.  I've posted one such example here:
>>>> http://casa.colorado.edu/~skillman/research_and_codes/files/0c4c670cea1660aecbf0d0abdf3f3120-3.html
>>>> Beware the movie is about 260 MB.
>>>> This is a fairly small simulation but is a good example of what the
>>>> volume
>>>> renderer can do.  I've implemented an "embarrassingly" parallel script
>>>> that
>>>> allocates one datadump/viewpoint to each processor.  Here each of the
>>>> 1717
>>>> frames can be partitioned and rendered in about a minute for a 1024^2
>>>> image,
>>>> meaning that on 16 processors this took about 2 hours.  If you have
>>>> questions about how the script works, please let me know.
>>>> 
>>>> Cheers,
>>>> Sam
>>>> --
>>>> Samuel W. Skillman
>>>> DOE Computational Science Graduate Fellow
>>>> Center for Astrophysics and Space Astronomy
>>>> University of Colorado at Boulder
>>>> samuel.skillman[at]colorado.edu
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