Groom hair noise and artefacts.

Development Rendering
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1

Hello.
I am trying to use the groom hair plugin to render hair for my character. I am getting some artefacts/noise in the hair’s shadows when “voxelize” is true in my groom asset settings.
If “voxelize” is false then there are no shadows from the hair and the result is poor, if it is true then it looks good but I get this noise.

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001656×875 193 KB

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011656×875 150 KB

02
021656×875 197 KB

I managed to reduce the noise slightly by setting all lights in the scene to “cast deep shadow” and executing the following cvars;

r.HairStrands.DeepShadow.SuperSampling 1
r.HairStrands.Voxelization.Virtual.VoxelWorldSize 0.1

But I am still getting a lot of noise in shadows on the hair.

I am in UE5 using raytracing, my GPU is an RTX A6000

Any ideas on how to improve this result?

2

Are you using RectLight or SpotLight? I noticed fewer artifacts while using SpotLight.