Hair/Fur sampler won't work in Cuda

[DHX KBuckley]

I'm currently doing render tests between VRay CPU and Cuda in VRay v4.03.02.00001 and I have a character that has a painted map for hair color steaks. In CPU I get a great looking predictable render using the VRay Mtl Hair 3 shader and a hair sampler node. When I switch to Cuda using a VRay Hair Next Mtl shader and a hair sampler node I don't get a render at all. The VRay frame buffer window just re-shows whatever my previous render was with no changes or updates.

In the following Chaos Group documentation it says that the hair/fur samplers are compatible with Cuda but It doesn't seem to be true as far as I can see: https://docs.chaosgroup.com/display/...orted+Features

Can anyone tell me if there is a special method to make this work in Cuda or is the documentation a little over optimistic??

[DHX KBuckley]

Forgot to mention I'm using Xgen..

[yolov]

It's supposed to work. Are you using xgen groomable splines or archives? I don't remember if there were some limitations, but point me in the right directions with more details and I'll be able to check.

[DHX KBuckley]

The asset is using groomable splines.

[yolov]

Does hairNext work with CPU in this case?
It seems to work fine for me in simple scene. Any chance you can send us a scene?

[DHX KBuckley]

I'll have to check my scene to see if it functions in CPU with the VRay Next shader. I'll look into sending you a scene file so you can replicate my problem, just need to get permissions to do that first.

[DHX KBuckley]

OK Yolov it turns out you are correct the hair sampler does work in Cuda and the hair next shader. The color changes from my ramp were not noticeable but then I increased the bounces under the advanced tab to a much higher number and now I can see the colors changing. Thanks you.

[yolov]

Good to know, thanks for the update!