I saw a demo some months ago and I had the exact same questions that you have. That engine seems like magic. The camera movement is perfectly fluid. The environment even has wind and waves in realtime. It has clouds, sun, fog, whatever. And you can interact with the environment, break stuff or create stuff. It's not a static environment. In the demo I saw, the person was creating a road from scratch. A photorealistic road, created from scratch, in seconds, across a mountain (the mountain profile adjusted itself to the road, automatically). And it was immediately possible to go there, zoom in and out. All real time, all with a perfect image. I was fascinated. If Vue could render at this speed...