Rendering the SkyAtmopshere component using Vulkan with and without Vulkan (SM5) enabled causes artifacts to appear on screen on Windows and Linux. 


This was reported and tested in 4.25.1 (CL-13594126) and reproduced in 4.24.3 (CL-11590370).

Steps to Reproduce
  1. Open the UE4 Editor and create a new project
  2. Go to Project Settings -> Windows -> Targeted RHIs -> enable "Vulkan (SM5)" and set "Default RHI" to Vuklan
  3. Restart the Editor
  4. # Delete Atmospheric Fog and the Sky Sphere from the Level
  5. Add an Empty Actor to the scene
  6. Attach a SkyAtmosphereComponent to the new Actor
  7. Move around the Viewport

Results: Flickering artifacts when using the Vulkan RHI

Expected: There are no artifacts as D3D11 does not exhibit this issue

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ComponentUE - Rendering - RHI
Affects Versions4.
Target Fix4.26
Fix Commit14531527
Release Commit14531527
CreatedJul 16, 2020
ResolvedOct 21, 2020
UpdatedApr 28, 2021