Lumen static mesh broke into strings of mesh

[Zandermn]

My lumen scene was working fine, the distance field on each mesh looks similer to their geometryic and no purpole on the lumen debug view.
But suddently, when I go back and open this level again. All my static mesh looks like strings of noodles.

I turn up all the static meshs distance field resolution scale and nothing change. What can I do right now to fix this problem? Thanks

Engine 5.0.3
Lumen
No hardware ray tracing

[Zandermn]

Temporaly solve this by delete all existing static mesh and reimport all static mesh to the engine.
But I am worried if I make a lots of edit, delete and reimport basically redo the whole scene, is there anyway to solve this problem?

[Arkiras]

This often happens when mesh distance field generation is set to 2-sided, or if you’re using a two-sided material on the mesh during distance field generation. But you say you checked the distance fields and they look find so… I don’t know.

My advice would be to upgrade to a newer version of the engine (upgrading a COPY of your project first to make sure it works) unless there is a particular reason why you are still on 5.0.3

[jblackwell]

They’ve improved distance field generation and surface cache behavior in later versions. You should also consider upping the distance field generation resolution?

[Zandermn]

Thanks for the help Arkiras.

Never throught the two side material can also be the problem for creating distance field. Definally looking forward to future version of the engine.

Wish you the best.