Strange squarish solid colors appears on screen for a second then disappears

Development Rendering
1

Hi,

In 5.3, 5.4 and 5.5 (I couldn’t test with older version) I noticed that in my project, every now and then some squarish bloomed artifacts appears on the screen.

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I’m using DirectX 11 (tried even with DX12 just because, still nothing) , no DLSS / FSR, no plugins, no ray-tracing, no lumen, etc.
Simple directional and 4/5 spots scattered in the map. So not many things.

This issue happens both in editor and build and, something particular, I noticed it’s something which happens only with the RTX graphics card

This was tested with 8-9 graphics cards (GTX and RTX), old and newer driver (also tried to change game to studio driver)

So far, no luck finding what’s the cause.

Does anyone have any clues?

2

r.bloom 0

in console command

3

I could use

r.BloomQuality 0, as r.bloom doesn’t exist

But that doesn’t really solve the issue as it is not that the problem

Those square appears and go away in a second or so
The issue is related to the appearing of those squares, which shouldn’t exist in the first place

4

We had this happen a couple years back. We were working on an ArchViz interactive park for a city. Our culprit was the glass material on the basketball hoop backboard. Ours was black, no emissive. It even showed up faintly when rendering out stills at 64 subsamples . I can’t recall exactly what I changed within the glass material but it went away and never came back.