Lumen and Packed Level Actors

So, I’m not sure if this is just something that isn’t currently supported, but packed level actors don’t seem to work well with lumen, specifically, interior and complex meshes that are made up of modular meshes.

For example, I’m using PLA to create rooms out of modular meshs, as a prefab, however, the surface cache shows pink for the interior. It could either be some parts of the interior or most of it. The meshes are fine before packaging which leads me to believe that it has to do with the BPP and instanced static meshes. It’s almost as if PLAs are acting as one complicated static mesh which typical is responsible for the pink highlighted surfaces.

I’m not too familiar with how ISMs works with LOD and read that HISM are better for LOD, but I don’t even have a choice between ISM or HISM for packaging. I’m not even sure if there’s an option to convert an ISM component into HISM within the BPP.

I don’t know if this because I’m missing something when working with level instances or PLAs are under beta so lumen isn’t fully supported yet.

If anyone has a solution for this or recommends an alternative method, I would greatly appreciate it.

We are using the last version of UE (5.1.1) and we still have this issue with packed level actor and Lumen. For example interiors with PLA are not participating in indirect lighting while it is the case after breaking it.
Does anyone have information about this?

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Hi, it should be fixed in 5.2.

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Good to hear, I can’t wait to check it out. Thanks for the update, much appreciated!

Just checked in 5.2, but the issue is still present unfortunatly…

I just checked and it works on my end. Are you packing Nanite static meshes? Lumen doesn’t support non Nanite static meshes in HISM, so if you pack those they will be black in surface cache.

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Ah yep got it, actually, some of them were not nanite.
I did not check the cache. Thank you