Apply a geometry node on each face of a geometry


I hope I can describe my problem clearly.

It can be assumed that all surfaces consist of four points.
I would like to apply my own written Geometry Node to each face of a Geometry. This means that I want to select one face per run and also determine the center of the highest and lowest edge of this area.

Unfortunately, I’m not very familiar with the mechanics of Geometry Nodes. Maybe I’m thinking a bit too much with normal programming languages.

Is it possible?

Thank you in advance and best regards

Seems like you can get more info on this at ?

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