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.



On Wed, Dec 29, 2010 at 4:19 PM, Chris Malone <chris.m.malone@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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