3.6, new hybrid mode limitations

[snivlem]

Hi, I couldn't see this here:

https://docs.chaosgroup.com/display/...aryLimitations

But it looks like the following doesn't work in the new hybrid mode of rendering

distanceText
TilesTex (and presumably all the other plugin textures).

[vlado]

The tiles texture should work fine, as well as many other plugin textures.

Best regards,
Vlado

[snivlem]

Hi Vlado,

On the left is the CPU progressive renderer, on the right is CUDA with hybrid mode on.

- The VRayDsitance text (the green ground plane) plugged into a VRayMtl diffuse slot renders black with CUDA
- The tilestex (the masonry for this building) plugged into a VRayTriPlanar node into a VRayMtl diffuse, there is an obvious difference between the two (scale is wrong)
- The trees in the background have a discrepancy and that's just a VRay2Sided Mtl...it doesn't look like hybrid mode supports "multiply by front diffuse".
- I have a Maya water node which is plugged into a projection node which is plugged into a VRayMtl bump slot, so I can get a wavy effect on the windows - that's not coming through with CUDA hybrid mode either.

Thanks.

[snivlem]

It seems that in OpenCL mode in hybrid mode, tilestex will not render at all.

[yolov]

Hi, here's some info that I hope you find useful:

- The VRayDsitance text (the green ground plane) plugged into a VRayMtl diffuse slot renders black with CUDA

The DistanceTex is not supported on the GPU at all, it shouldn't work even without Hybrid Rendering.

- The tilestex (the masonry for this building) plugged into a VRayTriPlanar node into a VRayMtl diffuse, there is an obvious difference between the two (scale is wrong)

This is something that we'll check and get back to you.

- The trees in the background have a discrepancy and that's just a VRay2Sided Mtl...it doesn't look like hybrid mode supports "multiply by front diffuse".

The "multiply by front diffuse" is also something that is not currently supported on the GPU and should again not work even when Hybrid rendering is disabled. (I'll make a note to edit the "supported features" page, the information is not entirely correct for the 2sidedMtl there).

- I have a Maya water node which is plugged into a projection node which is plugged into a VRayMtl bump slot, so I can get a wavy effect on the windows - that's not coming through with CUDA hybrid mode either.

The Maya water node is not supported in VRay at all. The CPU renderer will do "something" but it won't be even close to what the water texture is supposed to render like. It currently renders as noise, so using a noise texture instead will produce the same effect and will also work on the GPU. I'll check in with the devs if we can improve this somehow.

[yolov]

It seems that in OpenCL mode in hybrid mode, tilestex will not render at all.

We'll check up on the tilesTex and get back to you. But in the meantime, could you let us know how you're setting up hybrid rendering for OpenCL? It's supposed to be a CUDA-only feature and there's an entirely separate way to set up for utilizing the CPU for OpenCL rendering: https://docs.chaosgroup.com/display/...wareandDrivers

[snivlem]

But in the meantime, could you let us know how you're setting up hybrid rendering for OpenCL?

Like this:

[yolov]

Ah, that won't work I'll make a note to possibly hide the c++/cpu choice when in OpenCL mode, it's intended to work for CUDA only.
For OpenCL, you need to install the appropriate SDK from the vendor (amd or intel). Then there will be another possible choice listing the CPU/SDK device for OpenCL like this:



There's links to the respective SDKs here: https://docs.chaosgroup.com/display/...wareandDrivers
where it says CPU (Using Intel or AMD OpenCL runtime)

[yolov]

Btw, we did some tests here with the tilesTex and there is indeed some scaling issue with CUDA. We've logged a bug with the developers.

[snivlem]

Ah, thanks for clearing everything up Alex.