Ideally what I would like to reach in fiber directions is like this photo (If we look at the top view). There are orthogonal fibers and also in an annulus in the bottom of the hemisphere, there are circumferential fibers. So, I would like to model this kind of anisotropy by defining the fiber directions in some way.

I can also consider the fiber directions like the following image if I simplify my model:











Bellow is another image showing this fiber directions:

I would deeply appreciate your time.