When "r.EarlyZPassOnlyMaskedMaterials" is enabled, masked materials used with particles will flicker when close to the camera.

Found in 4.17 CL# 3658906, 4.18 CL# 3832480, 4.19 CL 4033788, 4.20 CL# 4369336, 4.21 Preview 1 CL# 4435822, and 4.22 CL# 4457235


Steps to Reproduce
  1. Open the editor
  2. Go to Project Settings>Rendering>Optimizations and enable  "Masked material only in early Z-pass"
  3. Restart the editor
  4. Create a simple masked material with a base color and opacity mask
  5. Create a particle system with the material
  6. Place the particle in the level and move closer to it

The materail will flicker the closer to the camera is to the particle system

The material would not flicker

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Won't Fix
ComponentUE - Rendering - Niagara
Affects Versions4.
CreatedOct 12, 2018
ResolvedAug 18, 2021
UpdatedSep 19, 2021