[yt-users] volume rendering in parallel

[Matthew Turk]

Hi Luigi,

> I attach to this e-mail a sample script for volume rendering. With YT 1.6 I
> used the old version of volume rendering (also in parallel) without problems,
> but now (I run on trunk, with an updated revision) I can run this script only
> on one CPU. If I try a parallel run, I get the following output:

Yeah, looks like I broke it.  The new "camera" interface is far nicer
for the user, but required some invasive changes.  The old mechanism
for parallelizing volume rendering also required image plane
decomposition, but Sam Skillman has implemented kD-tree decomposition
with post-processing compositing of images, which should be much
faster and easier on the system because it allows for a full
volume-decomp and better load balancing.

Sam, what's the current state of your kD-tree?  I think that since the
image-plane decomp is currently broken, we can either fix that for
both the volume_rendering and camera interfaces and continue to use it
(even though it's worse) or we can finish up moving to the kD-tree.

Either way, Luigi, this weekend I'll try to fix the script you sent,
even if it ends up being kind of a hacky solution...

-Matt