>>373322694
I made an attempt at an udon tank when it first came out and sort of solved it like this: You create a post-processing zone that's outside the boundaries of the hull and only active when a player is seated inside the tank. It's shaped like a box with a tank-shaped cavity inside of it. If a camera (eg the player's head) leaves the cavity and enters the zone the post blinds them. It's not perfect in this video because i stopped working on the tank before fine-tuning the PP transition but the principle is fine.