Huh it’s crazy but I’ve never noticed the padding in the past. I’m by no means doubting you it’s just I swear I had them in previous zoos as I don’t use them to often and it seemed like the last time was just a straight walk all the way through.
I've noticed both.
As an example, imagine the crocodiles/gharial on the surface and the way they move across the water. Now picture them sinking with that same animation, then changing to their walking animation on the bottom. That's what I've observed with the hippos.
That said, given that the crocs/gharials don't interact with an underwater environment, I kind of wish the hippos didn't either. It's cool making udnerwater viewing areas but the majority of the zoos don't actually do it for hippos, as they spend a lot of time on the surface, too (I know some zoos do, so nobody need bombard me with images of "real life examples", I'm saying that most zoos don't).
For me it's zero-sum. Either all or nothing. I think Frontier's next big step with PZ ought to be making the other aquatic/semi-aquatic animals behave properly underwater, even if that doesn't necessarily mean adding new aquatic animals. I'd love underwater viewing windows for bears, tigers, elephants, hippos, and crocodilia to actually mean something.