Rotate 3D sprites to point at the camera

Hi all,
I'm in the middle of creating a scene where a camera (on a path) passes several 3D layers. On the 3D sprites is a .png mapped of a figure. Is there a simple way to make the 3D layers automatically rotate around their Y-axis so the mapped figures appear to be looking at the camera while it passes by ? It seems a huge work to achieve this by manually adjusting the parameters of the layers...
Thanks in advance for the reply!
Sven
ps: using After Effects CS3, CS4 is at my disposal if needed.

You can auto-orient layers in all 3 dimensions using Layer/Transform/Auto-Orient.
To limit it to the Y axis, look at Dan Ebbert's expression on his website:
http://www.motionscript.com/design-guide/auto-orient-y-only.html

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if (dlg.symbol.bedding.value) {
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if (dlg.symbol.bedding.value) {
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Rotate 3D sprites to point at the camera

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