Is it a bug?
I get strange spots of maximal ambient occlusion.
To reproduce the problem I set up a little example.
What I’ve done:
*added a Plane *subdivide it several times *applied a displacement mod with a cloud texture *setup ambient occlusion (set pink color to highlight it) *set auto smooth to as smooth as can be (180°)
As result I got a mesh with strange spots with maximal ambient occlusion. (Pic 1)
When I triangulate the mesh it gets better but there are still a strange spots. (Pic 2)
Rendered with Eevee there seems to be no such behavior. (Pic 3)
What can I do as workaround? Adding much more geometry is not option for me because my original mesh is a very large landscape and my system is on it’s limit.