The geometric extension for a ridge filter consisting of ridgepins can be found under /topas_extensions.
The python files can all be run when creating a virtual environment through python -m venv env and installing all the needed modules by first activating the venv through . env/bin/activate.
Then install all the modules through pip install -r requirements.txt.
The bulk of the python code is in geneticAlgorithm.py it pulls from most of the other python files, though this repository has not been cleaned entirely.