question

sk x avatar image
sk x asked ·

can someone explain why this Shader renders wrong on GPU?

Rubber Material renders probably on CPU with Arnold 5.4.0.0 C4DtoA 2.6.0



same Rubber Material with GPU Arnold 5.4.0.0 C4DtoA 2.6.0




Node

arnold-shader-network-editor.jpg


Scene Files

c4dtoa-gpu-rubber-material-test-scene.zip
hdr.zip

shadersgpushaderarnold gpu betaramp
rubber-material-cpu-arnold-5400-c4dtoa-260.jpg (166.2 KiB)
rubber-material-gpu-arnold-5400-c4dtoa-260.jpg (192.0 KiB)
arnold-shader-network-editor.jpg (221.4 KiB)
c4dtoa-gpu-rubber-material-test-scene.zip (1.8 MiB)
hdr.zip (527.1 KiB)
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Adrien Herubel avatar image
Adrien Herubel answered ·

Hi, we found the issue there is a bug in how the tscale parameter is handled on the image node. This is tracked internally in #8758, and should be fixed in an upcoming bugfix release.

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Mike Samoylov avatar image
Mike Samoylov answered · 
ramp_rgb Connected colors and positions not supported.

https://docs.arnoldrenderer.com/display/A5ARP/Supported+Features+and+Known+Limitations

I think that's why ...

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sk x avatar image sk x ·

Yeah I guess, well, I have no idea how that one flew over my head.

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sk x avatar image
sk x answered ·

Thanks for having a look.

FYI
Windows 10
GeForce RTX2070
NVIDIA Studio Drivers 431.70
Optix 6.0

rubber-material.ass


rubber-material.ass (176.5 KiB)
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Declan Russell avatar image
Declan Russell answered ·

I'm not seeing anything that sticks out in the shading network. Could you export this to an .ass file for me please? I don't have C4D to hand.

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