One-sided layers

Apply this expression to the opacity attribute and it'll disappear whenever it's flipped away from the camera. You need to have an active camera in your composition for this one to work.

After Effects 6
Camera
Expressions

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//applyTo: opacity
a = toWorldVec([0,0,1]);
b = thisComp.activeCamera.position - toWorld(anchorPoint);
c = dot(a,b)/length(b);
if (c > 0) 0 else value

(Min. Version: After Effects 6, Category: Camera, Type: Expressions)

posted by MicGyver on Sep 15, 2008