CGI-Quality said:
It isn't, not when implemented efficiently. One thing this demo lacks is a need for considerable reflective sources (an area that where rayracing truly shines), and if this demo used realtime raytracing, it would look considerably better (ala, Metro: Exodus). Yes, it looks fabulous as is, but with proper implementation, that image would jump tenfold. |
Full RT puts a serious stress on the gpu doing all the ray thingies. UE5 already puts a serious stress on the gpu in this demo. If that same demo were done with full RT, it would seriously tank framerates. I think a lot of people will be pissed once games come out with full RT, but with serious performance problems. Cerny hinted at this in his talk when he came to the different levels of RT on one of his slides.
Getting clues from a tech forum, the UE5 demo also runs on the XSX, but with reduced details due to the advantage of the PS5's ssd solution (and no, the reason is NOT that the ssd is faster, it's about all the hardware "behind" the ssd which does the real work. We still don't know anything about the hardware behind the XSX's ssd, but this demo might be a small glimpse that it is not be as thoroughly implemented).
One thing I'd be interested to know is how much disk space this demo used. A ton of streaming was involved.
Last edited by drkohler - on 14 May 2020
