Here's the problem. You want to make an architectural form with an irregular polygon as the footprint. The corners will be curved and you want all the curtain wall modules to be exactly the same size, within visual and construction tolerances.
Typically, this is a painful process of trial and error, as a change to one geometrical relationship affects all other relationships in the system, as they are all dependent. This is a perfect opportunity to use a genetic algorithm to find local optima that minimize visual variance, reduce cost, adhere to geometric constraints, and satisfy construction tolerances.
The parametric model prioritizes exact module dimensions on straight segments to utilize off-the-shelf components, while minimizing the number of the curtain wall dies required for the curved segments. This minimizes cost while providing the desired visual consistency.
Anchor points can provide control over where the module lands on any given segment, so that you can align to other geometry in the project. If two adjacent segments are constrained, an arc segment will no longer provide the necessary tangency, so the algorithm creates a bi-Arc with minimum distortion.