Integrate AMD Radeon Rays in GIProbe

[sp82]

Hi,
Right now GIProbe use one and only one cpu core and no GPU power at all.
I think AMD Radeon Rays can be a good solution to accelerate GI (and also AO) with GPUs and CPUs. It is a rays intersection acceleration library and it is also optimized for Realtime usage.
The library is intentionally simple to use and vendor agnostic.
The project is mature and used also in Radeon ProRender developed by AMD, last updates from AMD can be found here: https://www.youtube.com/watch?v=kZNznb-mJFE
GPUOpen Article : https://gpuopen.com/gaming-product/radeon-rays/
Github: https://github.com/GPUOpen-LibrariesAndSDKs/RadeonRays_SDK
WhitePaper: https://32ipi028l5q82yhj72224m8j-wpengine.netdna-ssl.com/wp-content/uploads/2016/08/169798-A_AMD_RadeonRays_Intro_FNL.pdf

Best Regards,
Salvatore

[CptPotato]

Interesting stuff, thanks for bringing it up. I think this can be useful for quite a few things not only GI baking. And while I feel like there are a lot of other 3D / rendering related things that are more important right now, I'd love to see something like this implemented in the future.

[OvermindDL1]

As a usage note, the latest steamaudio library uses the AMD Radeon Rays library as well to perform the audio occlusion testing and so forth so it has fairly major usage already.

[DevMagicLord]

Would this work with Nvidia 3D cards ? Or it is specific to AMD hardware ?

[OvermindDL1]

Would this work with Nvidia 3D cards ? Or it is specific to AMD hardware ?

@DevMagicLord Unlike nVidia, AMD's gaming-oriented libraries actually work on everything.

[reduz]

It can be interesting, not for GIProbe (which uses voxels, so this is useless) but for lightmaps. Will see after 3.1 is out.

[sp82]

http://www.luxrender.net/wiki/LuxRays is also a good contender, using some AI filter I think you can use this raytracers also in realtime for lighting.

EDIT: another contender in town based on vulkan compute: https://github.com/world8th/vRt

[SiebrenW]

It seems LuxRays' domain is expired. They may have migrated to https://luxcorerender.org/ since that's not expired and this would be the source link: https://github.com/LuxCoreRender/LuxCore . I see it's Apache licensed and has some Blender integration.
It's OpenCL though, while Radeon Rays 2.0 can be used in Vulkan, which has better support (OpenCL on Nvidia is stuck on 1.1 and I believe it's even worse with Mesa3D on Linux)
My preference would be with Radeon Rays.

[OvermindDL1]

Mesa has OpenCL 1.1 full support with some support for 1.2, which is quite a bit better than nVidias drivers. Vulkan is the better modern method to use now overall.

[clayjohn]

Note: GIProbes now use mostly GPU. Also note that Radeon Rays is no longer open source.

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