The ocean rendering is made with screen space grid, it was missing from environment probes, until now:

fun fact: i shipped screen space grid for water on PS2 around 2000. afaik, i was the first one

How are the probes generated? Are they like separately rendered cubemap?

Yes it's rendering the scene into regular cubemap. Instancing is used to replicate geometry to multiple faces.

I see, thank you!

How do you do the caustics?

Based on this shader: And sampled it 3 times with different offsets for a rainbowy effect.

@Nintendo hire this man