Hidden Gems: 3D Space

Chris & Trish Meyer’s series of tips, tricks, gotchas, factoids, and shortcuts continues with CMG Hidden Gems: Chapter 13 - 3D Space.

This article, 1st of a group of 4 on 3D in After Effects, covers Rotation versus Orientation, 3D Views & Shortcuts, View Options, Axis Modes, and Mixing 2D and 3D Layers. That last section is good to review because of the gotchas with Layer Styles and Adjustment Layers with AE 3D. Chris explains:

Groups of 3D layers that are stacked between 2D layers in the Timeline panel are internally flattened down to a 2D result, as if they were in a precomp by themselves. The entire composition is then rendered as if it consisted only of 2D layers, with each group of 3D layers being treated as a single 2D layer in the middle of the stack.

AE Help explains it this way:

You can apply a layer style to a 3D layer, but a layer with a layer style can’t intersect with other 3D layers or interact with other 3D layers for casting and receiving shadows. 3D layers on either side of a layer with a layer style can’t intersect one another or cast shadows on one another.

If you remember that it's an odd man out in render order, Layer Styles are useful beyond the obvious for light wraps (see AE Portal) and Track Matte shadows (explained by Chris Meyer in an earlier Hidden Gem; other wrinkles at PVC). Keeping track of render order is tricky, for more see Creating Motion Graphics (AEtuts+ book review), Standard render order and the Transform effect (video by Todd Kopriva), 3D layer interactions, render order, and collapsed transformations in AE Help, and Understanding The Render Order In After Effects at AEtuts+.