Is that the Hardwater addon? I bought that one… I think it won’t work unless you do have a continuous mesh.
If you want to join those Hexes to share verts, do your own combine but:
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eliminate dupe verts (don’t try to be clever, just brute force it for the first version)
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renumber triangles that use eliminated dupes
If that’s fast enough you’re done. I assume this only happens on level load?
Otherwise you’d need to make a spatial bucketing thing to speed up the eliminate dupe verts.
ALSO, for future reference, photographs of code are not a thing.
If you post a code snippet, ALWAYS USE CODE TAGS:
How to use code tags: Using code tags properly