[yt-users] camera rotations doing vr on a gadget ds

[Nathan Goldbaum]

On Wed, Sep 10, 2014 at 12:12 PM, Desika Narayanan <dnarayan at haverford.edu>
wrote:

> Hi All,
>
> I'm working with the changeset in the PR:
>
>
> https://bitbucket.org/yt_analysis/yt/pull-request/1193/fix-bug-with-mismatched-smoothing-trees#comment-3027301
>
> that has allowed gadget data sets to be visualized using volume rendering.
>
>
> The following script:  http://paste.yt-project.org/show/5113/
>
> (written with a good bit of help by Matt) produces the following image
> ('junk.png' in the script):
>
> http://i.imgur.com/ro7fWZ0.png
>
> note, the script relies on a function elsewhere (ds_zoom) that finds the
> parttype0 density peak, and cuts out a region around it (for use with
> cosmological data sets in this case).
>
>
> My issue is that I'd like to use the nice camera rotation features, which
> you can see I've included at the bottom of the script taken from the yt
> docs.    The rotated images are all super dark though:
>
> 2 of them can be found here:
>
> http://i.imgur.com/tbsbkti.png
> http://i.imgur.com/SHY0KjJ.png
>
> I've tried crankng down the clip_level by a factor up to 1e3 and don't see
> much change.  Is this a transfer function issue?  Or are there other
> keywords that I might try? (I can't seem to find much else in the help docs
> for cam.rotation).
>
> Finally, as a side question, is there an obvious way to make a color bar
> for this sort of VR image?  The only description of this I could find
> (though maybe missed it?) in the docs was associated with off-axis
> projections, which didn't work in this case.
>

Can't really help with the other questions, but Mike Zingale recently added
an example of this:
http://yt-project.org/doc/cookbook/complex_plots.html#volume-rendering-with-annotation


> Thanks for any thoughts on this!
>
> desika
>
>
>
>
>
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