Any sources? I know about the 4x raytracing performance rumour but that got put on all tech websites but never heard anything about 3x. That was a single rumour though. Anyway I find 3x-4x very unlikely given that devs have been claiming that the bottleneck for raytracing is currently in shading performance so I don't see an easy way to increase raytracing performance by that much.
Have to disagree here I think it looks amazing, obviously I'm talking about the Raytracing as the game is a mixed bag graphically but I'm excited for the tech.
Devs should include RT global illumination before even thinking about reflections. Made a huge difference in Metro Exodus.
I don't know much about graphical computation, but how computationally expensive is RT GI compared to RT reflections and RT shadows?
I wouldnt use ubisoft games as a representation of next gen visuals. I called it earlier that their next gen titles wouldnt even look as good as current gen titles.
Yeah, there's definitely something up with the daytime rendering. I went back and looked at some WD2 gameplay and it wasn't anywhere near this flat and washed out. I think there's something up with the shadows or something
It depends on the type of GI - you can do "RT GI" in a very cheap way as described by here but it is not really tracing the lighting in the scene, rather it is tracing the occlusion of baked probes in the scene. It is going to have accuracy issues and issues of dynamism. So you can have something called "global illumination" modified by RT, but it is not the real deal. So I am not sure exactly why Cerny put the difficulty ordering in that way above^^ - maybe he is putting RTGI below reflections there since he is referencing cheaper approximates like the link I put above instead of the real deal.
Cerny said its difficulty is in this order for the PS5
There is no "most" and "least" expensive with RT, everything is down to particular implementation, just like with rasterization. You can have reflections done sparingly, with high level of cut off on non-glossy materials and they'll be relatively fast or you can have all the world reflecting light with multiple bounces and this will be slow as hell. Same goes for anything done with RT really, with the only caveat being that in some cases you really start running into diminishing returns meaning that you're wasting performance on improvements which most people won't be able to notice.
I see
Somewhere between that cheap RT GI and the real deal. They need to detail it more, but it by its nature is going to be cheaper than the real deal since it is partially faked in screen space for dynamic objects and small assets, and the larger features are done in a simplified way. There is the theoretical scenario though that Lumen could be more expensive than the real deal ray tracing as it probably scales poorly. It is using simplified representations for larger/static objects, and if you wanted to increase that resolution of the simplifications for those larger objects, it could get crazy expensive real quick, unlike triangle ray tracing which handles resolution more gracefully.
Iirc hadows are not as expensive as reflections, especially if the game is doing transparency reflections as well as diffuse reflections rather than just opaque mirrored reflections.
I thought the mine craft demo showed night and day difference
