How to use ROOT's GDML visualisation in a script?

I want to be able to quickly use ROOT’s GDML visualisation from the command line.

Traditionally I have done it as so:

std::string testfile = "simple.gdml"

i.e., literally typing it into the root prompt by hand. This is not ideal.

I came up with the following pyROOT script to try and quickly view arbitrary GDML from the command line:

#!/usr/bin/env python
import ROOT
import sys

if __name__ == "__main__":

Whilst this looks like it should work, it does in fact not work! Instead I see a blank, frozen canvas. I find ROOT so strange, why doesn’t this work? What am I missing from this recipe? Any alternatives which are known to work that I can try?

Thank you.

Have you mistakenly not defined materials as I had?

Since the links no longer render for context here is the original post:

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