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cedrictatangelo
Participant
August 28, 2024

Mesh turning black after a long time

Hi guys,

I am facing a weird problem. After using my app developed wityh unreal 5.0, I get have some mesh turning black. Not all of them, just some random mesh in my level. Everything is completely baked in the map. I don't have code modifying textures or anything.

Does anyone has already experienced this problem?

Any thoughts?

Thx, Cedric

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5 replies

PDubulous
Inspiring
August 28, 2024

Texture streaming/ mip levels?  Perhaps Nanite?

 

 

cedrictatangeloAuthor
Participant
August 28, 2024

Thx for your suggestion. I am not using texture streaming, nanite or lumen

PDubulous
Inspiring
August 28, 2024

Not related a viewpoint or anything, like bounds where its trying to unload the object?  Just randomly over time?  Everything is 100% baked lighting?  I've seen that issue with normals, but not randomly.  Thats a pretty steady issue.  Perhaps try adding an emissive power to material and see if the material completely blacks out.  That would separate a material popping out vs a shading issue.  Its in both eyes as well?  Ive seen some things like that with instanced stereo.

cedrictatangeloAuthor
Participant
August 29, 2024

Well, I have checked bounds, normals and UV map and everything seems correct. I am not able to reproduce the bug, I have screenshots from my users. Seems like sometimes the objet is loaded black, they go in another room, come back, and the objet is correctly textured (probably because the objet is being culled and reloaded bu not sure).

But I have noticed that those object are not static, they are the only one in the map that are movable because I can activate/deactivate them (but they do not get black when activating / deactivating). Since they are not moved, I could put them stationnary instead (or even static because their shadow are not really important).

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