Unreal Engine Issues

UE-203464

ParticlePosition doesn't use Previous values

ParticlePosition doesn't use Previous values

Description

FHLSLMaterialTranslator::ParticlePosition does not return Previous information when request which can result in bad motion vector calculation.

 

Steps to Reproduce
  • Place the attached NS in a level
  • Modify the NS to use the attached material
  • PIE
  • Disable motion blur 'Show MotionBlur'
  • Set screen percentage very low 'r.ScreenPercentage 30'
  • Observe how visible the sprites are before / after the fix

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Fixed
ComponentUE - Niagara
Target Fix5.4
Fix Commit30621691
Main Commit30621696
CreatedJan 9, 2024
ResolvedJan 15, 2024
UpdatedJan 30, 2024