Fusion forest tutorial. Using Fusions particle system and some images you can create nice forest system to be used for maybe set extensions or matte painting fillers or flyover or...you think of something : )
So you can play along here are tree elements to download.
Movie file direct file download.

Fake ambient occlusion in Fusion. Using only fusion nodes to build Fake ambient occlusion pass similar to that used by crytek fabulous game engine.

Movie file direct file download.

Maya 2008 Shadow catcher shader setup.
Movie file direct download.