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SSS difference between GPU and CPU

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Message 1 of 3
am_wilkins
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SSS difference between GPU and CPU

Hello,

 

I've noticed a pretty massive difference between SSS on the GPU vs the CPU.
Same scene, same shader, same lights, etc.

 

Simple setup, just a mask driving the subsurface and a color chosen for the scattering color.

Type: Diffusion

Arnold Standard Surface (Not Material X)

 

Arnold CPU:

wing_SSS.png

Arnold GPU:

wing_SSS_gpu.png

 

The colour is just becoming white?

 

 

amwilkins

--

Houdini Core Version 20.0.590
Arnold Core: 7.2.5.2

HotA: 6.2.5.2

CPU: AMD Ryzen TR 3990x

RAM: 128GB
GPU: NVIDIA RTX A4000
OS: Windows

2 REPLIES 2
Message 2 of 3
lee_griggs
in reply to: am_wilkins

From the GPU docs:

lee_griggs_0-1710173521627.png

 

Try randomwalk 1/2 instead.

 

Lee Griggs
Arnold rendering specialist
AUTODESK
Message 3 of 3
am_wilkins
in reply to: lee_griggs

Hi,

 

Thanks this seems to do the trick. 

 

I hadn't checked that "Supported Features and Known Limitations" page for quite a few months, thought most features such as these would have parity. Good to know!

I was picking "Diffusion" for optimization reasons. Will use Randomwalk for now.

 

All the best,

amwilkins

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