Strong aliasing in hair created with alpha mask when Virtual Shadow Map is enabled.

UE5.1.0
I created hair with alpha mask.

Shadowing with Shadow Maps blurs the self shadows from hair to hair and is not very noticeable, whereas with Virtual Shadow Maps, the shadows are aliased and look messy.

Is there any way to blur the shadows from hair to hair in Virtual Shadow Map?

If there is no such method, I would like to know the best practices for using Alpha Mask hair in a Virtual Shadow Map environment.

Shadow Maps

Virtual Shadow Maps

Shadow Maps

Virtual Shadow Maps


The material used is shown in the figure below.

The Directional Light settings are

Intensity: 3.0 lux
Dynamic Shadow Distnace Movable Light: 100.0

The other settings are the defaults.

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