Re: Trees appearing on road then disappearing

From what I can make out the low LOD trees are rendered as some kind of 3D sprite projected onto the surface of a sphere that is roughly the size of the tree. If you get too close to the surface of the sphere (as happens if you have the Trees setting too low) then the 3D sprite shader throws a wobbly and the tree appears to shoot into the air and disappear. This is also why low LOD tree roots show through some of the terrain as they are depth buffered using the range of the sphere surface rather than the range of the trunk surface.

Setting Trees to higher levels moves out the range at which the 3D sprite transitions to a proper 3D rendering of the tree so the issue becomes less noticeable.