Description

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

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

Expected:
The material would not flicker

Have Comments or More Details?

There's no existing public thread on this issue, so head over toAnswerHub just mention UE-65185 in the post.

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Backlogged
ComponentRendering - Cascade
Affects Versions4.174.184.194.204.214.22
CreatedOct 12, 2018
UpdatedOct 17, 2018