[Bf-cycles] Multiple Cycles standalone integration questions

[Brecht Van Lommel]

Hi,

Be aware that Cycles standalone is mostly a test application for now and is
not feature complete. We'd be happy to accept patches that improve it
though.

On Sat, Jul 21, 2018 at 1:13 PM Prayaag Kasundra <prayaag at decorastudio.com>
wrote:

> 1- How to set a specific GPU in cycles standalone while running on multi
> GPU system?
>

The code here has not yet been updated for the latest multi GPU changes, so
this doesn't really work.


> 2- How to enable Denoising?
>

It's not currently supported.


> 3- How to only render specific meshes from a scene (rest of area renders
> as alpha)?
>

You can set use_holdout="true" for all th other objects.


> 4- Is there any way to read image data stream/buffer from ongoing render?
> If there's, will it work even if we are running in --background and --quiet
> command line options?
>

No, it's not supported currently.


> 5- How do we set environment map (cube or equirectangular ) via XML?
>

The background uses a shader graph just like any other object, so you would
add an Environment Texture node for this. Note Cycles only supports
equirectangular currently, not cubemaps.


> 6- (unrelated to standalone but...) Will cycles perform slower on a GPU
> that's added to USB connected external PCI slot compared to PCI slot on the
> motherboard?
>

Yes, but how much depends. What will be slower is transferring data to the
GPU, mostly when the scene rendering starts. It may also be slower during
the path tracing, or maybe there is barely any difference. I'm not really
sure what kind of latency differences there are between USB and PCI-E for
this kind of setup.

Regards,
Brecht.
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