Use your fingers or mouse to control model
(hold shift key or use mouse wheel to zoom it).
0 < Step < 1 controls the number of leaves.
300 remote trees demo. Instanced trees
with simplified trunks and point cloud based foliation
(made of sunny tree).
1000 trees demo.
Both are fast on GeForce GTX 560 but rather slow on mobile devices.
May be bump mapping is better?