How to cut a plane with a mesh?

I have a mesh and plane. I am failed to cut the plane with the mesh.

The code I am testing is:

from vedo import *

c = Cylinder(pos=[0, 0, 0], r=10, height=10)

verts = [(-20, -20, 0), (20, -20, 0), (20, 20, 0), (-20, 20, 0)]
faces = [(0,1,2, 3)]

mesh = Mesh([verts, faces])

ret = mesh.clone().cutWithMesh(c)

show([(c, mesh), ret], N=2)

And the result is empty (right):

I expect the following result:

How can I implement this requirement? Any suggestion is appreciated~~~

[zhang-qiang-github]

Thank your very much for the kindly reply. It is what I want.

I want to know what’s the meaning of 4 in subdivide(4, method=1). The function explanation shows: n: number of subdivisions. I find there are 16 squares in the yellow plane. How to understand the 4&16?

[marcomusy]

No, it’s probably the visualization that clips in the range of the object - click on the renderer then press r