Unreal Engine Issues and Bug Tracker (UE-290804)

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]|https://drive.google.com/file/d/1exdRQ7G5tsq2GgQ_OU-J13vz7x--xsct/view?usp=drive_link]
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

There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-290804 in the post.

0	Login to Vote

Fixed

Component	UE - Rendering - Graphics Features
Affects Versions	5.6
Target Fix	5.8

Fix Commit	52221686

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