Chris Zwar at ProVideoCoalition has an article on Bining and After Effects Rending order in the public beta of After Effects. The embedded video is about 45 minutes long, but well worth checking out. And you should also check out his 18 part series on After Effects and Performance which I have talked about before.
The video goes into 2D layers and precomps (rendering from the bottom up), and then 3D layers which is where Binning comes in, which connects all 3d layers that are next to each other in the timeline as a single render so you don’t get motion blur issues of individual layers in a created object. The new beta includes labels to show you how 3d layers are binned in the timeline, which will prove very useful to anyone who does a lot of 3d within After Effects.
It is funny, he started on After Effects 3, and I believe I started on version 4, though he is certainly more of a master than I am.
