How to avoid connecting edges when plotting a surface

Hello everyone !

I would like to plot the following surface, but I don't want the surface to fill the space in the gap that you can see in front (that spoils everything to what I want to explain with that figure).

I cannot find any way to solve this... any suggestion ?

Thank you !

My code is the following :

 surf(X,Y,unwrap(phi),'FaceColor','yellow','EdgeColor','none')
camlight left;
lighting phong
axis off

Answer 1

[Wilson Duarte]

please refer to the solution provided here:

https://www.mathworks.com/matlabcentral/answers/712893-why-surface-plot-is-connecting-its-edges