Unreal Engine Issues

UE-39061

Back Lighting For Hair Shader Changes Its Falloff Unexpectedly

Back Lighting For Hair Shader Changes Its Falloff Unexpectedly

Developer Notes

A possible fix was mentioned by stororokw in this forum thread.

https://forums.unrealengine.com/showthread.php?133690-DFAO-with-characters

Feel free to try it out as a workaround until this is addressed officially.

UDN
Description

The dynamic shadow distance will change the falloff for back lighting on the hair material. The parameters listed for back lighting occlusion in the material graph didn't seem to have any effect.

Steps to Reproduce
  1. Open attached project
  2. Open TestMap
  3. Position camera so that the light source is behind the hair like in attached screenshots
  4. Change the dynamic shadow distance on the directional light

RESULT
The back lighting changes its falloff.

EXPECTED
The back lighting is unaffected by the dynamic shadow distance.

Community References

Artifact in hair rendering

Hair shader issues

Hair shader calling with wrong arguments?

Have Comments or More Details?

There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-39061 in the post.

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Won't Fix
ComponentUE - Graphics Features
Affects Versions4.11.2, 4.12.5, 4.13.2, 4.14
CreatedNov 28, 2016
ResolvedMar 4, 2020
UpdatedSep 19, 2021