I want to select only this points of paraboloid

paraboloid.gh (13.4 KB)

Hello guys…
I am newbie in rhino can anyone help me how to select only marked points. (refer Image)


paraboloid_re.gh (12.6 KB)

Thank you so much @HS_Kim it is very help for me. Looks like alot of leaning ahead
:blush::blush:

Alternatively, you could avoid Flip, TStat and Branch by using List Item directly after Partition (green group), flattened or not.

partition

@huzefam1, your ‘Angle’ sliders would make more sense if you right-click the Rotate ‘A’ (Angle) input and enable ‘Degrees’ instead of the default radians (~57.3 degrees). FYI.