Nanite

Conan Exiles included a tool call Simplygon that generated different LODs for meshes. UE5 added a technology called Nanite which removes the need for custom LODs.

Nanite means Unreal is doing the same work that Simplygon is doing. Since UE5 has tech to do the same work, Simplygon is … simply gone.

That does mean a bit of work for each static mesh. You need to follow these steps for each of them.

1. Open up the static mesh.
2. If you zoom out from the mesh, you will notice that it turns into something else. All of the base assets turned into sticks.
3. In the LOD Settings, set Number of LODs to 1, and then hit apply.
4. In the Nanite Settings, Select Enable Nanite Support and then Apply Changes

The Retail assets all have a little stick as their extra LODs, so we’ve been chasing things turning into sticks for ages.

If you can’t use Nanite for your mesh, you will need to re-create the LOD chain via other tools. Nanite doesn’t support transparency so if your mesh includes transparency, you’ll need to generate LODs.