Attached please find Script to create Egg Shape, using equations of Tadao Itou, whom can be googled.
(There is an egg thread over on Alibre Forum.)
Only half an egg is needed due to MoI's abilities.

There are an infinite number of parametric scripts possible.
Some parametric scripts create curves which MoI users may benefit from.

I was wondering if such curves become Nurbs curves, and also their level of accuracy?

Once again, the ToroidalHelix script was used as the model. It is almost a blueprint for parametric equations. :)