Note, for this asset to work you also need RobinTheilade.UnityFramework
Runtime Tree Colliders enables you to have colliders on trees in scenes where there are too many trees for PhysX to handle.
Simply add the main component to your terrain and make sure you have capsule colliders on your terrain trees and you are up and running.
Features:
• Low number of colliders for trees
• Quadtree for great performance
• Documented C# source code (available on github)
• Free
• Only changes colliders when player have moved
• Easy to set up
• Works with Unity and Unity Pro versions 4.5 and 4.6
• Tested with 70.000 trees in a 2000x2000 area
• Example scene included
• Precompiled code with namespaces
• Tree collision information
Limitations
• The colliders does not move with the wind
Unity Forum: Here
YouTube: Here
GitHub: Here