Hi Noel, I don't have time to fix this at the moment, but it should be a quick fix. Take a look at $YT_HG/yt/utilities/command_line.py. That file contains all of the logic for the command line subcommands. You'll probably need to modify the argparse argument parsing code for the render command to properly capture the field argument. If you have success with that, please don't hesitate to issue a pull request for the change. Take a look at the yt developer's guide ( http://yt-project.org/docs/2.5/advanced/developing.html#contributing-code) for more detail on issuing pull requests. -Nathan On Wed, Jul 3, 2013 at 11:33 AM, Noel Scudder <noel.scudder@stonybrook.edu>wrote:

Hi yt users,

I'm having a problem volume rendering through the command line. I've been playing around with the yt command, and I noticed that when I do

$ yt plot --field density plt_def_00020

I will get plots for my axes just as I would expect. However, if I do

$ yt render --field density plt_def_00020

I get the following error:

Traceback (most recent call last): File "/home/noel/shocks/yt-x86_64/bin/yt", line 9, in <module> load_entry_point('yt==2.5.4', 'console_scripts', 'yt')() File "/home/noel/shocks/yt-x86_64/src/yt-hg/yt/utilities/command_line.py", line 1691, in run_main args.func(args) File "/home/noel/shocks/yt-x86_64/src/yt-hg/yt/utilities/command_line.py", line 97, in run self(args) File "/home/noel/shocks/yt-x86_64/src/yt-hg/yt/utilities/command_line.py", line 1404, in __call__ cam = pf.h.camera(center, L, width, (N,N), transfer_function=tf) File "/home/noel/shocks/yt-x86_64/src/yt-hg/yt/visualization/volume_rendering/camera.py", line 225, in __init__ self.log_fields = [self.pf.field_info[f].take_log for f in self.fields] File "/home/noel/shocks/yt-x86_64/src/yt-hg/yt/data_objects/field_info_container.py", line 131, in __missing__ return self.fallback[key] File "/home/noel/shocks/yt-x86_64/src/yt-hg/yt/data_objects/field_info_container.py", line 131, in __missing__ return self.fallback[key] File "/home/noel/shocks/yt-x86_64/src/yt-hg/yt/data_objects/field_info_container.py", line 130, in __missing__ raise KeyError("No field named %s" % key) KeyError: 'No field named Density'

It looks to me like the Camera function isn't being called with a specific field, and is defaulting to "Density", which is not a field for Castro data. I took a stab at fixing this by editing the camera line to

cam = pf.h.camera(center, L, width, (N,N), transfer_function=tf, fields=field)

But then my command yields the following error:

Traceback (most recent call last): File "/home/noel/shocks/yt-x86_64/bin/yt", line 9, in <module> load_entry_point('yt==2.5.4', 'console_scripts', 'yt')() File "/home/noel/shocks/yt-x86_64/src/yt-hg/yt/utilities/command_line.py", line 1691, in run_main args.func(args) File "/home/noel/shocks/yt-x86_64/src/yt-hg/yt/utilities/command_line.py", line 97, in run self(args) File "/home/noel/shocks/yt-x86_64/src/yt-hg/yt/utilities/command_line.py", line 1404, in __call__ cam = pf.h.camera(center, L, width, (N,N), transfer_function=tf, fields=field) File "/home/noel/shocks/yt-x86_64/src/yt-hg/yt/visualization/volume_rendering/camera.py", line 225, in __init__ self.log_fields = [self.pf.field_info[f].take_log for f in self.fields] File "/home/noel/shocks/yt-x86_64/src/yt-hg/yt/data_objects/field_info_container.py", line 131, in __missing__ return self.fallback[key] File "/home/noel/shocks/yt-x86_64/src/yt-hg/yt/data_objects/field_info_container.py", line 131, in __missing__ return self.fallback[key] File "/home/noel/shocks/yt-x86_64/src/yt-hg/yt/data_objects/field_info_container.py", line 130, in __missing__ raise KeyError("No field named %s" % key) KeyError: 'No field named d'

I tried to delve a little deeper, but couldn't make any more headway. Does anyone know how to fix these errors? Thanks in advance.

Cheers,

Noel Scudder

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