Skybox illumination increases gradually on launch

Development Rendering
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When I launch my game the skybox gradually becomes brighter.

I thought that by removing all the default lighting actors in a default project would remove this, but that doesn’t seem to be the case.

Left is the UE editor viewport. Center is the game running after a few seconds of the light adjusting. Right is what I was hoping it'd look like, shown in the space skybox generator
Left is the UE editor viewport. Center is the game running after a few seconds of the light adjusting. Right is what I was hoping it'd look like, shown in the space skybox generator1920×360 42.2 KB

Here are some things I checked that were suggested to other users who were experiencing similar problems:

My camera isn’t using post processing
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My skybox texture LOD is noMipmaps, texture group: Skybox, UserInterface2D (RGBA) compression.
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I’m not sure if World Settings Lightmass has anything to do with it, but here’s that;

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In the skybox’ material settings, Two Sided is set to true because apparently it prevents lights from outside the skybox from penetrating it and illuminating surfaces. And the shading model is unlit.
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The materials lightmass settings are both 1.0, changing them didn’t appear to do anything.

Please let me know if you know of a way to stop this unwanted illumination.

wallover4

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It sounds like auto exposure.

You can turn it off in the PP volume ( or limit it ).

If you want a quick check, just set these two to the same value

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2 Likes
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I don’t have a pp volume actor. I added one and set those two values to zero but that didn’t stop it.

I just noticed however that my material is setting the emissive color, so it’s probably that.

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1 Like
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I appear to have been mistaken, it wasn’t due to material outputing as an emissive color.

I linked it up to normal, slapped a directional light in there that revealed skybox still appearing blurred by light, so I’ve reverted back to outputting the emissive color.

1 Like
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Even if you don’t use PP, the system will by default use ‘eye adaption’.

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I exported the skybox file at a lower resolution, targetted for source, and the image was much nicer. I realized I had the viewport set to unlit, so I changed that which helped later when I saw your last comment which had me re-add PP and - yep, I see the difference now.

Cheers, ClockworkOcean :beer:

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:sunglasses: :+1:

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Hey I was having the same issue with my skybox gradually becoming brighter and more blurry and turning off the the auto exposure immediately solved the problem, thanks my dude!

1 Like