Contour Line at specific position

[g.synetos (g.syn)]

Hi all,

A rather basic question but as i m a begginer in grasshopper i cannot figure out the correct way to make contour lines of a surface at specific location.
The way i m doing it right now is shown below. However if the slider exceeds a specific distance the curve from explode tree is different.

Ultimately, what i would like to do is give distance from XZ plane in panel (i.e 1000 , 2750, 6000) and extract the contour lines.
Any advise would be really helpful.

Thanks in advance

[Matt_Harwood]

Attach your file and someone will help. Make sure you internalise all geometry.

[Joseph_Oster]

Instead of contours, maybe what you want is plane intersections? Sec (Brep | Plane)

[g.synetos (g.syn)]

Thanks Joseph!