Unreal Engine Issues

UE-224705

Dark square appears in hair in direction of spotlight when shadows disabled

Dark square appears in hair in direction of spotlight when shadows disabled

Description

A dark square appears in the direction of a spotlight on hair when the spotlight has no shadow.

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In UE 5.4 the dark square is visible when the spotlight has no shadow, and a light square is visible when it has a shadow - however this appears to be fixed in 5.5.

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Steps to Reproduce
  1. Download HairSMRepro.zip sample project
  2. Open HairTestMap level
  3. Orient the main viewport so you are looking through the hair at the spotlight

Expected

No square artifact is visible around spotlight

Actual

A dark square is visible around the spotlight, and the size appears related to ContactShadowLength in ApplyContactShadowWithShadowTerms() in DeferredLightingCommon.ush

 

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Unresolved
ComponentUE - Graphics Features
Affects Versions5.4, 5.5
Target Fix5.6
CreatedSep 18, 2024
UpdatedSep 23, 2024
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