When a material is utilizing emissive color, separate translucency, and the project is using MSAA the material will give off intense bloom to the point of flashing the screen.
[UPDATE] After additional testing I found this to be caused by the TextureCoordinateNode on channel 0 having values either just slightly above 1 or below 0. This issue can reproduce just by increasing the G or R channel of the coordinate node by a large power in a translucent or additive material (see SimpleMaterial.jpg). You still need MSAA and Separate translucency though.
Attached is a GIF demonstrating the issue. I reproduced this in 4.14 the flashing wasn't quite as dramatic.
RESULT
The entire screen will flash either pink or white (strobe light like effect)
EXPECTED
The static mesh gives off an emissive glow that is expected for default bloom settings. No intense flashing.
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There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-43545 in the post.
| 4 |
| Component | UE - Graphics Features |
|---|---|
| Affects Versions | 4.18 |
| Created | Mar 31, 2017 |
|---|---|
| Resolved | Aug 18, 2021 |
| Updated | Sep 19, 2021 |