Pre-rendered in this context means you still have access to the full 3d scene so you can generate the full gaussian splatting model from that. The benefit here

Pre-rendered in this context means you still have access to the full 3d scene so you can generate the full gaussian splatting model from that. The benefit here would be to lower the cost of rendering that complicated scene. There is a game called Fantasian (by the former FF dev) that uses real-life dioramas as backgrounds, I bet this tech would've been perfect fit for that too.