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It seems there is some bug in the vertex normal calculation,
getGridNormal
. The normal vector for the center of a tile does not correspond to near normals. You can see it if you draw onlylight
interrain_combined_medium.frag
:I'm looking into the issue.
For now, I have one workaround - to average tile normals for the center point. Since the center point is the average of tile points. Looks better: