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(L) [2013/09/05] [tby voxelium] [giga rays on intel phi] Wayback!Impressive performance! Are your kernels publicly available somewhere?
(L) [2013/09/05] [tby graphicsMan] [giga rays on intel phi] Wayback!Interesting. Do you have numbers for diffuse interreflections?
(L) [2013/09/06] [tby straaljager] [giga rays on intel phi] Wayback!Looks like Whitted ray tracing, not even ao. Are you sure this quality is still relevant today?
(L) [2013/09/06] [tby jbikker] [giga rays on intel phi] Wayback!Regardless of ray distribution, I think 1.2G is amazing, and it's very cool that you managed to break the 1G barrier! Wald wrote in his slides for a SIGGRAPH course a few years ago 'ray tracing performance is expressed in *millions of rays*, not thousands'. Looks like this has to be adjusted for today. [SMILEY :)]
Also, for that kind of scenery, a Titan can perhaps reach 500M, so the phi appears to be vastly better for ray tracing. That's a good thing if you want to sell a new architecture.
(L) [2013/09/09] [tby mpeterson] [giga rays on intel phi] Wayback!@graphicsman: not yet. more "in-deep" test for any kind if distribution will come in the next weeks.
just ordered a titan to see and compare different scenarios. pt results as soon as it arrives.
this is a nice research project. we have to build a system that can trace 256 rays/pixel@1080p > 10fps
for a given set of shaders. now we have to select hw that looks most promising when running our
kernels on top.
mp
(L) [2013/09/09] [tby graphicsMan] [giga rays on intel phi] Wayback!256 eye rays or total rays?
(L) [2013/09/09] [tby jbikker] [giga rays on intel phi] Wayback!Even with total rays, that's like 5G, minimum. You intend to use 4 phi's?
By the way, I'm not sure how the phi will behave with divergent rays; CPUs tend to suffer badly if you can't use large packets anymore (as in: 10x slower). GPUs do much better in those situations. If you expect to use a random ray distribution, you may want to look into that.
(L) [2013/09/09] [tby voxelium] [giga rays on intel phi] Wayback!>> jbikker wrote:By the way, I'm not sure how the phi will behave with divergent rays
In my experience, the Phi handles incoherent rays pretty well: [LINK https://twitter.com/attila_afra/status/365142667396517888/photo/1/large]
(L) [2013/09/10] [tby jbikker] [giga rays on intel phi] Wayback!Do you happen to have that car scene available? I managed to find a similar model of the car online, but I would love to test the exact scene on a Titan.
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