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question
sk x avatar image
sk x asked · Aug 12 at 03:52 PM

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

shadersshadergpuarnold 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 · Aug 20 at 05:39 PM · ACCEPTED ANSWER

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.

sk x

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Mike Samoylov avatar image
Mike Samoylov answered · Aug 13 at 03:45 PM
ramp_rgb Connected colors and positions not supported.

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

I think that's why ...

Declan Russell
sk x

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sk x avatar image sk x · Aug 14 at 07:23 AM

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 · Aug 13 at 04:51 PM

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 · Aug 13 at 02:48 PM

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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sk x avatar image Satish Goda avatar image Will Vinson avatar image kennybadex kennybadex avatar image Rafael Garcia Zas avatar image Neil Stringer avatar image Paul Van Emmerik avatar image Adrien Herubel avatar image
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