[yt-users] ProjectionTransferFunction()
Matthew Turk
matthewturk at gmail.com
Tue Jan 22 13:55:16 PST 2013
Hi Mike,
On Tue, Jan 22, 2013 at 4:25 PM, Michael Kuhlen <mqk at astro.berkeley.edu> wrote:
> Hi all
>
> I'm not having any success with off-axis projections using the pf.h.camera()
> with AMRKDTree and ProjectionTransferFunction(). cam.snapshot() returns an
> all-zeros array, even in situations where ColorTransferFunction() produces
> great images.
>
> This script (based on the first part of amrkdtree_downsampling.py)
> demonstrates the problem: http://paste.yt-project.org/show/3072/
>
> Any ideas what's going wrong? Maybe something to do with preventing the
> log'ing of the field, which I attempted to do with
> "pf.field_info['Density'].take_log=False"?
Last Summer, during the course of the threading of the volume
renderer, the camera class was split up into a couple different
things. You should be able to get exactly what you're looking for by
using projection_camera instead of camera. The function
off_axis_projection will also work for this purpose.
Something I think could be improved is to make the off-axis projection
functionality much more distinct from the volume rendering; this would
allow, among other things, the ability to specify a data object rather
than a kD-tree volume for the off axis projection. I think this would
be a big improvement, since unlike the volume rendering, off-axis
projections are unordered and can thus be trivially masked. Cameron
is working on a YTEP to the effect of improving the volume rendering
API, and this should probably be a part of that.
-Matt
>
> Thanks for you help!
>
> Mike
>
> --
> *********************************************************************
> * *
> * Dr. Michael Kuhlen Theoretical Astrophysics Center *
> * email: mqk at astro.berkeley.edu UC Berkeley *
> * cell phone: (831) 588-1468 B-116 Hearst Field Annex # 3411 *
> * skype username: mikekuhlen Berkeley, CA 94720 *
> * *
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>
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