They might well have been. the two video's you linked to aren't valid evidence of it though.
Next gen lighting technologies - voxelised, traced, and everything else *spawn*
- Thread starter Scott_Arm
- Start date
In an effort to try to keep this thread focused on Lighting Technologies, a new thread was created for all the posts of "____ is using RTX" located here: https://forum.beyond3d.com/threads/gartx-games-and-applications-using-rtx.61234/
Calling all the experts on this forum.
Could this: http://jcgt.org/published/0008/02/01/
be an alternative to pure ray tracing for next gen games?
Could this: http://jcgt.org/published/0008/02/01/
be an alternative to pure ray tracing for next gen games?
It scales well. Works better with RT hardware IIRC viewing the demo.
Ike Turner
Veteran
New Unity short (this time pre-rendered in engine not running in real-time). 100% rasterization no RT:
Making off Part 1 (lookdev/cinemachine): https://blogs.unity3d.com/2019/06/11/introducing-sherman-part-1/
Part 2 (lighting/animation/vfx graph): https://blogs.unity3d.com/2019/06/11/introducing-sherman-part-2/
Making off Part 1 (lookdev/cinemachine): https://blogs.unity3d.com/2019/06/11/introducing-sherman-part-1/
Part 2 (lighting/animation/vfx graph): https://blogs.unity3d.com/2019/06/11/introducing-sherman-part-2/
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Creating the Atmospheric World of Red Dead Redemption 2: A Complete and Integrated Solution
http://advances.realtimerendering.com/s2019/slides_public_release.pptx
Source: http://advances.realtimerendering.com/s2019/index.htm
http://advances.realtimerendering.com/s2019/slides_public_release.pptx
Source: http://advances.realtimerendering.com/s2019/index.htm
D
Deleted member 2197
Guest
CPU / GPU hybrid RT in World of Tanks (no DXR):
CPU does BVH using Embree, tracing on GPU.
BVH for 30 Tanks (each 50000 trianlges) takes 1.5ms on CPU.
GPU does 1 rpp (vehicle shadows only - probaly also sun only) and denoising for area light.
(BTW, pretty well explained in german without marketing BS
)
BVH for 30 Tanks (each 50000 trianlges) takes 1.5ms on CPU.
GPU does 1 rpp (vehicle shadows only - probaly also sun only) and denoising for area light.
(BTW, pretty well explained in german without marketing BS
)
Now it hit me. This is the future of next gen console games.
Remember how CELL promised to usher in a new era of simulation/AI/physics heavy games? Remember most of it's horsepower ended up going into offloading tasks from the GPU that just could barely get the tasks devs were aiming for at 720p...
Yeah, prepare for another 6 years of that again.
D
Deleted member 2197
Guest
So ray traced shadows only on "intact vehicles (not destroyed ones)". Nice compromise to avoid any performance loss.
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There has been a lot of talk about moving the intersection closer to the CPU side of things on the APU. But I'm not necessarily sure, and we haven't seen that type of design before. Obviously for nvidia it's RT needs to be on the GPU, since it has no other way to get it closer to the CPU. But perhaps intersection hardware might be better closer to the CPU, I dunno.
Being closer to the CPU I'm not sure has it's advantages either. But if you have spare cycles on CPU, perhaps it could do intersection. Many Ray Tracing farms are still CPU based as I understand it.
There are some here that could provide much better commentary on it.
Yup, one of the better videos on ray tracing and acceleration structures.CPU / GPU hybrid RT in World of Tanks (no DXR):
CPU does BVH using Embree, tracing on GPU.
BVH for 30 Tanks (each 50000 trianlges) takes 1.5ms on CPU.
GPU does 1 rpp (vehicle shadows only - probaly also sun only) and denoising for area light.
(BTW, pretty well explained in german without marketing BS
DavidGraham
Veteran
This is the video in English
They do the BVH on the CPU, is this the same in DXR too?
Also they limit the RT shadows to intact tanks (damaged models don't cast RT shadows), I wonder about the reason for this intact tank limitation, what's the difference between an intact tank and a damaged one RT wise? more BVH work on the CPU?
DXR will call on the driver to perform the function. I'm not entirely sure if its possible to have the driver perform the calculation over the CPU, because which GPU vendor would write that type of driver?
edit: answer below.
CPU fallback layer.
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I knew somebody would say this. 7TF + CPU BVH build = 10 TF, haha
No, NV certainly does it on GPU. I remember Exodus talk mentioning 4 ms IIRC, but they have been hidden with async compute.
Sounds they use prebuild BVH for intact models, and likely only refit that + building top level AS. But i don't know.
In any case, building or refitting bottom level AS is a task very well suited to GPU. Also CPU SIMD, but i assume GPU to be 20x faster. Bottom level can be a problem to saturate the GPU, and i think that's one reason why hiding it async works so well.
Downside of CPU build would be skinning has to be done on CPU as well, but with 8 cores + AVX256 that's surely an option, especially on consoles having unified memory. If so however, hope on mesh shaders shrinks maybe.
DegustatoR
Legend
https://www.computerbase.de/2019-10/world-of-tanks-encore-rt/
BVH creation and updates are handled on CPU by the driver on NV RT capable h/w (Pascal and Turing).
Ray traversal and intersection testing through DXR is performed on SPs on Pascal and TU11x Turing and RT cores on TU10x Turing.
So even when async call is submitted to update the BVH, it still occurs on the CPU?
Interesting.
Shoot, how are people supposed to figure this stuff out? Doesn't that indirectly tie your RT performance with your CPU?
DavidGraham
Veteran
Yeah I remember Battlefeild V requiring a much higher CPU to drive the DXR reflections.
I have to mention, what World Of Tanks is doing reminds me a lot of NVIDIA's Hybrid Frustrum Traced Shadows (HFTS) released in games like Watch Dogs 2, Battlefront 2 and Division.
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