Thank you. Does this address the first case where it captures the top left vertex, but not the bottom right vertex? It looks like this is a cosmetic fix, but the navigation server should receive the bottom right vertices.

Maybe this should be ceil instead of floor. Or +2.
https://github.com/TokisanGames/Terrain3D/blob/main/src/terrain_3d.cpp#L651

Or this <= region_loc + region_size
https://github.com/TokisanGames/Terrain3D/blob/main/src/terrain_3d.cpp#L643

I don't think those edges exist. Its the 0 to (region_size - 1) indexing thing again.

This is 9 64m regions, 5 of which are filled entirely with nav (with only the offset in the shader).

I think we should be drawing the region gizmo, and the debug view region grid with the 0.5 offset as well.

I did test the changes to _generate_triangles() but it had no effect, as it would just lookup that location, find no region (and thus no nav painted), and skip generating that triangle pair.