you can easily "recurse" them, plus the resolution doesn't decrease when you get closer, and there's no additional memory needed for the potentially 4 or 5 render targets if you are using deferred rendering
if they can prove it is raytracing then i would love to see that. although i don't really know what the point would be considering that you can do the same with a render target or stencil buffer
I mean you could do this recursively with N render targets and then put them into each-other. Wouldn't that allow portal recursion (You set a recursion-max yes, but you also set a ray-bounce-max and there's no point in going beyond a certain depth)
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Perhaps my definition of what ray tracing on modern hardware is wrong, I did not think that entire scenes could be ray traced in real time, this just looks like rasterization to me. I do have a bias against "ray tracing" due to Nvidias crappy hardware ray tracing, it just looks like a gimmick that reduces FPS and encourages the use of crap like DLSS. Granted I have not looked in years because I don't care about GPUs much