During the course of creating my “Bag End” scene for The Nature Academy competition one of the things I knew would be a challenge would be the sheer number of trees that would need to be created for the mid-ground landscape.
The obvious solution would have been to use an array of various 2D trees mapped to planes, seeded via a particle system on the lanscape. While this would have worked, I wanted to try my hand at something I had seen on the BlenderArtists forum. The following video is a time lapse of the creation process for the volumetric trees.
For those of you who like to reverse engineer blend files, you can find the one from the video here.