Unreal Engine Issues

UE-193200

Lumen causing exposure issues when several viewports are opened

Lumen causing exposure issues when several viewports are opened

EPS
Steps to Reproduce
  1. Unzip, load the project: [Link Removed]
  2. Open the level ./darkening_demo/Content/Levels/L_darkening_test.umap
  3. You should get a layout with 3 viewport panes with the project, if not please use a 3-pane layout preset.
  4. Set top-left viewport camera to CineCameraActor0, top-right to CineCameraActor1, and bottom to CineCameraActor2.
  5. Middle-click the top viewports to change focus between top-left and top-right viewports.
  6. Notice the change in brightness of the inactive top viewports. (the active one should be normal, and the inactive one should be noticeably darker).
  7. Set the CineCameraActor2 XY and Z transforms to 0
  8. Repeat step 5 and notice there is no darkening of the inactive viewport any longer.

Have Comments or More Details?

There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-193200 in the post.

2
Login to Vote
Unresolved
ComponentUE - Rendering - Graphics Features - Lumen
Affects Versions5.2.1, 5.3
Target Fix6.0
CreatedAug 16, 2023
UpdatedMay 15, 2026
View Jira Issue