AutoDraw Onion
Onion autodraw is a multilayer using three spines. Starting from a portal, it draws consecutive layers. It does not aim to maximize the number of layers.
There is three variants.
The algorithm adds layers until it's not possible.
The algorithm adds layer on the spine that makes the layer closer to an equilateral triangle.
The algorithm enforces a balanced multilayers by throwing from spine 1, spine 2, spine 3, spine 1 and so on.
This usually ends with a smaller draw with less layers.
