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Answer by Phifo · Jun 21, 2011 at 09:09 AM
Collision detection is not supported for detail meshes.
http://www.unifycommunity.com/wiki/index.php?title=Terrain_tutorial#Detail_meshes_vs._Trees
Answer by Meltdown · Jan 06, 2011 at 11:24 AM
Add a rigidbody to your GameObject. If that doesn't work correctly try adding a basic box collider around your mesh to see if that works.
If you want your mesh to collide with fast moving objects change the collision detection to continuous dynamic, and if that still doesn't collide correctly try increasing the FixedTimeStemp value in your projects Physics properties.
Nope, in the prefab - added a RigidBody component - changed the collider to sphere - removed the RigidBody component and after all changes I applied to the, prefab I removed and readded the detail mesh to the terrain, tested but
still doesn't work. Could it be I'm on Win, not $$anonymous$$ac? It's nothing to do with FixedTimeStep or collision detection type, having no collisions at all. And it "should" work without a RigidBody.