Mesh name: [PCcase] part name: [PC_Case] could not be created because all of its polygons are degenerate. This is the error that appears when trying to import FBX files from other sources(Blender sites for selling 3d models
Hello there @Sumer2022ukraine!
Checking around the community, that error has been encountered a few times with certain types of assets. It means the model you are working with has faces with zero area (all vertices collapsed). This tends to happen with free assets in the web, you can find stuff with non-manifold geo, double faces, etc.
In order to try and fix the model, open it in Blender and implement the following options for a cleanup:
- “Merge by Distance” to remove any duplicate verts
- “Delete Loose” to clear stray edges and verts
- “Recalculate Normals”, then check for any non-manifold geometry
- Triangulate the faces with a Triangulate modifier
- Make sure you export it with “Apply Modifiers” and “Smoothing = Face”
After that, reimport into Unreal, and check if the mesh opens properly.