Added triang and kappa as iteration variables

[ym1906]

Description

Add kappa and triang as iteration variables

Checklist

I confirm that I have completed the following checks:

• My changes follow the PROCESS style guide
• I have justified any large differences in the regression tests caused by this pull request in the comments.
• I have added new tests where appropriate for the changes I have made.
• If I have had to change any existing unit or integration tests, I have justified this change in the pull request comments.
• If I have made documentation changes, I have checked they render correctly.
• I have added documentation for my change, if appropriate.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 31.19%. Comparing base (8966166) to head (3365b85).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3563   +/-   ##
=======================================
  Coverage   31.19%   31.19%           
=======================================
  Files          83       83           
  Lines       19936    19936           
=======================================
  Hits         6220     6220           
  Misses      13716    13716           

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[ym1906]

@timothy-nunn Would you mind reviewing this, before you begin converting it? 🙏