[Yt-dev] Volume rendering with current (3628:da3894bf42a5) change set

[Chris Malone]

Hi Matt,

Thanks for the feedback.

That's a bit odd!  My guess is that something's up with the center and
> domain left edge info.  Can you run with --detailed or
> --paste-detailed, and it should give info about the center and LE
> variables.  Alternately, you can run with:
>
> python2.6 -m pdb some_script.py
>
> and print LE, LE.shape, self.back_center, self.back_center.shape.  It
> seems likely to me it's something like one is shaped (3,1) and the
> other (1,3) or (3,) or something.
>

After using the debugger as you suggested and looking more closely it seems
that LE is still an empty list because self.bricks = None even after a call
to self.partition_grids().  The latter is not working properly because
self._brick_collection.source._grids is an empty ndarray.  For example, I
get the following DEBUG message before the fatal error:

yt         DEBUG      2010-12-30 16:40:49,932 Preloading ['Density'] from 0
grids

I now need to track down why _grids is not being filled appropriately; all
the other grid-type-lists I have found are properly filled.

Do you want to push your Maestro changes so that we can
> take a look at them, see how they are implemented?
>

I have some clean-up to do on the code, but I will certainly push it once I
have things a bit better organized.

Chris

>
> -Matt
>
> On Wed, Dec 29, 2010 at 4:19 PM, Chris Malone <chris.m.malone at gmail.com>
> wrote:
> > Hi all,
> >
> > As previously mentioned, I'm working in my spare time to add support for
> the
> > Maestro code to yt.  I am able to read in the data, make slices of
> various
> > variables, and save the resulting plots.  I tried, however, to follow the
> > cookbook recipe for volume rendering and I keep getting an error while
> > attempting to ray_cast.
> >
> > Here is the script I use: http://paste.enzotools.org/show/1470/
> >
> > and here is the traceback:
> > http://paste.enzotools.org/show/Jn7X2pBPkUD0yhhLwrVv/
> >
> > I'm not sure if this is an issue with the way I have implemented Maestro
> > support or if there is a bug in the visualization.  Could someone please
> try
> > my script with their own parameter file to at least verify there is no
> bug
> > in ray_cast?
> >
> > Thanks,
> >
> > Chris
> >
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