Is there a way to manually control where the infinite ocean horizon ends? I tried rotating the v-ray plane and it doesn’t seem to affect the ocean. I’m trying to lower the horizon in my render to have less empty space between my model and the sky.
It’s infinite, so not really.
You can offset the horizon in the sun controls instead, or in an hdri by vertical rotation if that helps 
Hello,
You can use a V-ray Clipper to clip the ocean surface at render time. Hope that helps.
Cheers