Here’s a collection of links that helped me figure out a process to bring a 3D model from Sketchup to After Effects via Photoshop.
1) Install this plugin to export an .obj file from Google Sketchup:
Apparently the “pro” version of Sketchup will export obj without the plugin, but it’s $500 and I felt cheap.
2) Import the .obj file into Photoshop.
3) Setup lighting in Photoshop:
4) Import the Photoshop file into After Effects:
UPDATE: Now that After Effects CS6 includes built-in raycasting, this probably can be simplified somewhat.