Azl. Yes that would work too and also give a 3d type effect with shifting layers. I'm also working on some billboard tree and bush props that are just rectangelse with trees and bushes on them with transparency. That way you could litter the back field of the scene with these for very few polygons. I'll try the sphere withing a sphere idea too. Rendering just a ring of trees and bushes then making an alpha map for those you could run a few layers deep and turn them so they don't line up to get a thick forest.