I need to fill the holes in the mesh using Geometry Nodes:
I've tried using the Convex Hull node, but it creates a lot of extra edges:
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I don't know if this question deserves this answer (maybe it should be marked as duplicate), but I'll post it anyway. Maybe another idea will come up that will solve the task better.
My idea would be to proceed exactly as in the question, and remove the excess edges that
Convex Hull creates with another node group, which is described in more detail here: "Decimate: Planar" in Geo nodes
In this example, the node "299231" contains exactly the node group given in the other answer.
It may not be the best solution, but it works.