I need help with an extremely strange problem!

Development Rendering
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1

I’m having a strange issue where black pixel artifacts start appearing on the screen for no apparent reason. It happens randomly while moving around the map.

IMG-01 IMG-02 IMG-03 IMG-04

If I look in another direction where there are no black pixels, the artifacts disappear immediately, but after a short time, they come back again.

This is not hardware-related: I’ve tested the project on multiple machines and the issue behaves exactly the same on all of them.

I’m using Lumen, Nanite, and Ultra Dynamic Sky, in case that helps identify the cause.

  • This does not happen in the editor viewport.

  • It does not happen on other maps in the same project.

  • So far it happens only on the map shown in the images, and only in the packaged build.

I really don’t know what to do anymore, I tried looking for help on Reddit, but nobody could help me. I have no idea what it could be! When switching between FSR and DLSS, it changes the pixel color from black to white, but that’s all I have so far. If anyone has seen something similar or has ideas on how to debug this, I’m available to provide any extra information needed. Thanks in advance!

2

Hey @starni1514!

Let’s work toward finding the root first. Try going into your project settings and disabling Lumen, it’s known for black spots like this, then test it. If it’s still there, turn lumen back on, and try using a normal sky sphere instead of ultra dynamic sky. Chances are they’re interacting weirdly and you’ll need to set up your UDsky differently but you need to make sure that’s the issue first! :slight_smile:

Let us know!

3

During the intense brightness effect, I used the command “sg.GlobalIlluminationQuality” to see if it would have an effect, but the pixels remained. So I’m going to add the option “r.DynamicGlobalIlluminationMethod” to disable it at runtime while this problem occurs, since it doesn’t always happen and only in one map. I fear it might be a PostProcess conflict, so I’ll remove those as well! I’ll be back with more information soon.