BUG - Vray 5 GPU texture error in instanced tyflow objects

[squintnic]

I have just upgraded to vray 5 - specifically to use vray GPU tyflow instance support but am having issues with it across multiple scenes with it not picking up mapping. I tried with a texture map in the attached image. 1 is CPU and 2 is GPU - notice how it loses the mapping? This is a tycache of a simple sim.

I also tried with a gradient map on a tyflow without cache making sure to have mapping transferred across but again it doesnt seem to show in GPU?

I use online render farms to make my work and GPU in this case is about 50% faster than CPU so it can save me a lot of cash and my current work is relying heavily on particles.
Any ideas?

[squintnic]

I also tried switching from 'Instances' to 'meshes' in the tycache render rollout but same result. To get this to even render I had to also tick 'out of core'
Feels like its a bug in Vray GPU tyflow implementation?

[hermit.crab]

Could you send the scene to support@chaosgroup.com so we can take a look? Mention this thread in the e-mail, along with your V-Ray, host platform, GPU driver versions, and GPU model/s,

[squintnic]

OK sent thanks

[BBB3]

Yes. V-Ray GPU seems to have trouble transferring the UVW coordinates of am emitter object to the color of particles. The CPU version does it correctly but on GPU, the emitter's entire texture map is applied to each particle instead of influencing the particle's color (see images). Is this the same problem you're having Squintnic? I've sent the scene to support via GDrive.

[hermit.crab]

Thanks for the report. We are aware of the issue (internal bug-tracker id: VMAX-9867) and our developers are already looking into it.

[squintnic]

Yes. V-Ray GPU seems to have trouble transferring the UVW coordinates of am emitter object to the color of particles. The CPU version does it correctly but on GPU, the emitter's entire texture map is applied to each particle instead of influencing the particle's color (see images). Is this the same problem you're having Squintnic? I've sent the scene to support via GDrive.

Yep that's the same issue. Would be great to fix it cos it much faster rendering on GPU for me
Thanks for the response aleksandar

[squintnic]

Any progress on this one? Doing another bit of work like this one that uses loads of particles drawing mapping from velocity and adjacency to helper objects
This works in Redshift off the bat no issues.

For comparison this takes 10-15 mins on vray CPU and about 1.5-2 mins on RS (2990wx vs 2 x 2080) meaning its much cheaper for me to render this online.

[hermit.crab]

The fix is still under development. I'll notify you when there is a stable build in which it is implemented.

[squintnic]

great thanks

[BBB3]

Hi there. It's been a few months now. Any progress on this and supporting the Forest color bitmap (and the Railclone texture too while you're at it)?

[matanov]

The main issue from the thread should be already fixed in the nightly builds. If you want to test it before Update 1, please drop me an email.

Forest Color is supported since V-Ray 3.6 and RailClone Color since V-Ray 5. I think there were a couple of minor things that are yet to be implemented from Forest Color, but other than that it should be supported.

[BBB3]

The main issue from the thread should be already fixed in the nightly builds. If you want to test it before Update 1, please drop me an email.

Forest Color is supported since V-Ray 3.6 and RailClone Color since V-Ray 5. I think there were a couple of minor things that are yet to be implemented from Forest Color, but other than that it should be supported.

Hi Peter. I'm talking about the tint by bitmap option based on the UVW of the emitting object. We've talked about this a number of time. It's not working in the latest nightly. Neither is the UVW randomizing options of the RailClone map.
Or are you talking about a different nightly I don't have access to?

[matanov]

You mean the "As texture on surface" option in Forest Color, right? Also can you please send a simple scene for the RC UVW randomizing?

[BBB3]

You mean the "As texture on surface" option in Forest Color, right? Also can you please send a simple scene for the RC UVW randomizing?

Yes. That's what I mean. And yes, I'll send a scene asap.