Fastest way of distributing trees and grass on non-terrain mesh?

Scene & World Building Terrain
1

Hello,

I would like to know what is the fastest, most efficient way of quickly distributing trees and grass on a mesh that was not generated by unity terrain. Also, is there some way of making those trees convert to billboards automatically, like the terrain trees, or is that simply not possible?

Thank you very much

2

Have you looked into speed tree?

http://store.speedtree.com/product/speedtree-modeler-for-unity/

3

The MegaScatter asset works with Speedtree objects or other objects with lods etc. and can do runtime scattering which can greatly reduce your app size.