OPENMC has no attribute ‘Tracks’

User Support
1

Hello, I am getting this error message when I try to use track mode and plot particle tracks. This is the only attribute I get an error for. Any ideas why?

2

The Tracks class, which it sounds like you’re trying to use, was added in version 0.13.1 (which was released a little more than a week ago). If you are using an older of OpenMC, you’ll need to upgrade first.

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3

Thank you, it’s solved. However, in version 0.13.0, when running in track mode, I would automatically get a *.h5 file for every track individually. Now, I only get one file with all the tracks. It helps a lot in making my folder clean, but now I am having a hard time making a VTK file for an individual particle track.

For for example:

tracks = openmc.Tracks('tracks.h5')
track1 = tracks[0]
one_particle = track1.particle_tracks[0]

Any guidance on how I could convert this one particle track to vtk?
I tried tracks1.write_to_vtk('one_particle.vtp'), but it did not work.

AttributeError: 'Track' object has no attribute 'write_to_vtk'
4

Ah yes, that’s a good point. It’s still possible although it requires a little Python trickery. Because the Tracks class inherits from the basic Python list class, you can actually modify it in-place to reduce to a single track:

tracks = openmc.Tracks('tracks.h5')
# limit to first particle
tracks[:] = [tracks[0]]
tracks.write_to_vtk(...)
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