3D beam pattern plot

[FabriceReymond]

I'm trying to visualize beam patterns in 3D, but the current code seems to only support 2D beam pattern plotting. I couldn't find any functions within the class for 3D visualization. Is there a way to achieve 3D beam pattern plotting using the existing class methods? Is there a way to do that using any function of the class or should I use the same cos/sin definition used in the 2D case and adapt it to 3D geometry?