Hybrid Vray GPU?CPU

[Dentzz]

New post on fxguide
https://www.fxguide.com/featured/fmx...he-main-stage/
mentions this new Vray GPU CPU hybrid rendering. Seems interesting any other places like the cg garage podcast that it is talked about in more detail?

[chadstevens]

I've heard there will be a podcast on CG Garage at some point next week.

[piotrus3333]

you can do that in RT openCL but I guess nobody uses it (fretures limitations)

[savage309]

We have internal implementaiton that makes it so the CPU behaves as a regular CUDA device. It is available in the 3.5+ nightlies (just enable the CPU devices from the list of CUDA devices).
The render result should be the same no matter if you use CPU as CUDA device or native GPU. Also, this does not require any third party drivers or software, so it can work on pretty much every machine (or farm).

Best,
Blago.

[1funk]

Blago, do the modo nightly builds have this working?

[savage309]

Blago, do the modo nightly builds have this working?

I am not sure, Vlado Nedev will help with that answer If it doesn't have it yet, it will come.

Best,
Blago.

[1funk]

The modo install only has "Select OpenCL devices for V-Ray RT GPU" shortcut, but doesnt show any CPU devices.

I also have the standalone nightly installed (although its an old one) and it has a "Select devices for V-Ray GPU rendering" tool which shows a CPU device above my GPU


So it looks like this isnt working in modo yet

[savage309]

The CPU device will be labeled "C++/CPU" in the select devices tool.

Best,
Blago.

[1funk]

Yeah I see that in the standalone nightly, but not in the modo nightly.

Thanks for confirming

[vladimir.nedev]

Blago, do the modo nightly builds have this working?

The V-Ray for MODO nightly builds are from the stable 3.5 branch at the moment, where the CPU as a CUDA device feature is not present.

Greetings,
Vladimir Nedev

[1funk]

OK thanks for letting us know Vladimir

[Robert]

Chaos finally did what is the best solution. Now, no matter what Hardware you are using you can't be wrong.
Well just left open if AMD/ATI is in the game.

[GidPDX]

So does this mean there is one code base going forward OR that there still will be two, just that we can now run what use to be the GPU code on CPU?

I'm thinking it's just that the GPU version now runs on CPU yeah?

Either way it's exciting but just want some clarification as my quick read of the FXguide article didn't really seem to say.

[Alex_M]

This sounds exciting! I just tried the nightly of Vray for Max from 3 days ago to test the new hybrid CUDA rendering but most of the time when I start rendering with CUDA I get this error:

error: Error 700 while initializing context for device GeForce GTX 980! Device will not be used for rendering!
error: There is no device supporting at least CUDA 2.0!
warning: initDevices() failed. Please check that your system has compatible GPU devices installed.

When I render with the c++/CPU device I don't get this error but my GPU doesn't get used. I reinstalled the nightly two times with no change.

[Alex_M]

Sorry, double post.