Unreal Engine Issues

UE-290804

MRQ - No Rayrtaced Shadows casted from Groom Caches with only 1 Spatial Sample

MRQ - No Rayrtaced Shadows casted from Groom Caches with only 1 Spatial Sample

Description

A groom cache will not cast a raytraced shadow with only 1 spatial sample. It does not matter how many temporal samples you have.

Steps to Reproduce
  • Download project [Link Removed]
  • Open LS - /Game/Test/Hair/ShadowTest/GroomCacheTestSequence
  • Render with only 1 spatial sample, or just default settings
  • Change the Graph or MRQ config to have 2 spatial samples
  • See the shadow appear

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Unresolved
ComponentUE - Graphics Features
Affects Versions5.6
Target Fix5.8
CreatedMay 28, 2025
UpdatedSep 18, 2025
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