Black horizon line and artifacts

[fixeighted]

If it helps, this black line thing and the microfacet being the cause is discussed in this post and others.
Microfacet has issues with other stuff too but those and this is still not resolved, other than switching to blinn
https://forums.chaos.com/forum/chaos...ine-at-horizon

[waaazoo]

Strange, there should be no connection between the underwater plane and the horizon roughness. Can you share a comparison? Maybe it's something else that is causing it.

Cheers!

ok, sorry, disregard my comment about the ocean roughness. It was my impression as I was testing the black line problem but I couldn't reproduce it again.