Filtering Frames Above a Plane

[AlgoRitmo]

I have some frames, and I want to keep only those that are above a plane.

How can I do it?
Thank you

[laurent_delrieu]

Hello
it is quite always better to post a script.

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Here you compare a point with a double.
Also if your surface is on XY plane and flat it is surely OK
Do that and it could work but you should (MUST)surely must take just a single point from surface points

There are others ways of doing that are better.