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

[Desika Narayanan]

Hi Sam and Nathan,

Thanks both for the cookbook reference, and the clip_ratio location
suggestion!  The former is exactly what I'm looking for, and the latter
totally worked.

thanks again,
-d

On Wed, Sep 10, 2014 at 3:21 PM, Sam Skillman <samskillman at gmail.com> wrote:

> Hi Desika,
>
> Can you try moving the clip_ratio argument to the write_png() call?
>
> Something like:
>
> snapshot.write_png('camera_movement_%04i.png' % frame, clip_ratio=4.0)
>
>
> Best,
>
> Sam
>
>
> 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.
>>
>> Thanks for any thoughts on this!
>>
>> desika
>>
>>
>>
>>
>>
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>>
>
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