[yt-users] ProjectionTransferFunction()

[Michael Kuhlen]

OK, it's good to know about pf.h.projection_camera. That works for me.

I knew about off_axis_projection as well, but I had been using camera,
since it allowed me to do 3 projections simultaneously (as long as they
were unweighted). This functionality seems to have disappeared from
ProjectionCamera, which only accepts a single field, not a list of fields.
That's too bad, but definitely not a show stopper.

Thanks for the help.

Mike




On Tue, Jan 22, 2013 at 1:58 PM, Nathan Goldbaum <nathan12343 at gmail.com>wrote:

> 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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-- 
*********************************************************************
*                                                                   *
*  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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