User Asset Data 
Unreal Engine provides a mechanism to add metadata to UObject. Metadata can provide additional contextual information the developers or across application boundaries.
Simplygon specific tags 
The Simplygon UE4 plugin provides a specialized class to tag actors with the following tags:
| Tag | Description | 
|---|---|
| Clipping Geometry | Tag an actor as clipping geometry. | 
| Occluder | Tag an actor as an occluder. | 
These tags can be leveraged by the integration to provide additional data to the Simplygon API (i.e additional visibility or clipping information).
 Simplygon 10.4.132.0
Simplygon 10.4.132.0