Reply To: Need to define periodic holes next to the waveguide

[Ronald]

Dear Paul,

That is a good first step. The question is what accuracy do you need? Reusing available modules may save you time and you may, therefore, look into computer vision and animation where arc length on a parametric curve is common (to determine the speed of a camera or other object for example).

See for example opencv:
https://pypi.org/project/opencv-python/
https://opencv.org/opencv-2-4-8/

Ronald