Optimization of the rib propagation

The "optimize" option allows to compute the rib propagation faster.

This option can be activated all the instance of the propagation have the same shape.

If the option is activated, the propagation repeat exactly the same geometry than the original rib without taking in account the trimming faces. All the instance of the propagation will be trimmed the same way.

If the option is not activated, each instance of the propagation will be trimmed according to the neighbouring faces.