Issue running openmc-plotter (Something went wrong reading coeffs for surface #)

User Support
1

Hello everyone,
I have started using OpenMC recently and I am enjoying it quite a lot so far!
Since my geometries are becoming more complex, I have been trying to find way to visually inspect them for debugging purposes, and for this I found the openmc-plotter tool. However, I can’t seem to get it to work correctly, getting errors like:

 ERROR: Something went wrong reading coeffs for surface 1

The process for reproducing the error on my machine goes as follow, I do a fresh install of OpenMC via conda:

conda create -n openmc-env
conda activate openmc-env
conda install mamba
mamba install openmc

I then install the latest version of openmc-plotter:

mamba install openmc-plotter=0.3.1

I then test the resulting installation on two simple cases:

  • first on the *.xml input files present in the tests/setup_test folder of the openmc-plotter repo, in this case the program runs perfectly
  • second on the *.xml input files produced by the pincell example notebook from the documentation, in this case I receive the error:
     ERROR: Something went wrong reading coeffs for surface 3

Playing with the first geometry.xml file, it seem that if I turn the “coeffs” attribute from representing integers to representing floats (e.g. “0 0 2” to “0.0 0.0 2.0”), openmc-plotter can’t read the values anymore and the code stops working.
Does anyone know what may be the source of this problem? I feel like I am missing something.

Thanks!
Nicolas

2

@nlinden I think this has to do with your locale, which probably expects the numbers to be written with a comma instead of a decimal (for example, 2,0 instead of 2.0). While I look into a more permanent fix, can you try changing either your LC_NUMERIC or LC_ALL environment variable to “en_US.UTF-8” and see if that fixes the behavior?

3

This fixes the issue perfectly !
Thanks,
Nicolas

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