Import unity assets to unreal engine
Locate and select the source geometry used by the Forest objects you wish to export.
From here you can swap the geometry if you like simply by selecting another Static Mesh from the content browser and clicking the Use Selected Assets button. If you click on a Hierarchical Static Mesh actor, you will see that it contains one Hierarchical Static Mesh component for each asset as well a list of all the individual instances. In Forest Pack this will match the number of source models, in RailClone it depends on whether segments are sliced or bent as to whether they are instance or not and therefore exported as unique items. It also creates a Static Mesh asset for each unique piece of geometry. This is a very efficient way of creating thousands of instances in real-time.
#Import unity assets to unreal engine install
To use these features you need to install a Datasmith plugin for 3ds Max that's compatible with the Unreal Engine version that you are using. Unreal Engine's Datasmith tools support exporting Forest Pack and RailClone objects to Unreal with no need to Instantiate using Forest Tools.