Why have I black edges? (Painting UVs maps)

In case anyone is interested in the test results.

There is not difference between using six materials or a single material and six UV maps.
The drawing calls are exactly the same. Performance doesn’t improve or slow down at all.

I did the tests with 1200 cubes each.

Cubes with six materials (about 260 draw calls).

Cubes with six UV maps and a single material (about 260 draw calls).

Well, matter resolved…
If anyone would like to add any comments on this, I’d love to read them.

Thank you very much and greetings!!


EDITED:


Same test but all meshes are merged to a single actor (only six materials and only a single UV map)

177 draw calls

Empty level: (136 draw calls)