[yt-users] ProjectionTransferFunction()

[Nathan Goldbaum]

There's also OffAxisProjectionPlot, which wraps off_axis_projection, presenting an interface that is identical to the other plot window plotting routines.

It would be great if there were a true off axis projection data object, it would be much easier to integrate OffAxisProjectionPlot with the other plot window routines.

On Jan 22, 2013, at 1:55 PM, Matthew Turk wrote:

> 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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