Answer by Meltdown
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...
View ArticleAnswer by Phifo
Collision detection is not supported for detail meshes. http://www.unifycommunity.com/wiki/index.php?title=Terrain_tutorial#Detail_meshes_vs._Trees
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