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Auto orient y only

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Auto-orientation towards the camera is a 3D technique in After Effects with a lot of uses. Sometimes though, it would be better if the auto orientation only affected the layer's y axis.
After Effects 7
3D
Expressions

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This is especially true if you want the layer to maintain its vertical orientation. In those cases you may want the object to turn and face the camera but to also maintain its perpendicular relationship with the ground plane.

Here's the expression (apply it to the layer's y rotation property):
delta = toWorld(anchorPoint) - thisComp.activeCamera.toWorld([0,0,0]);
radiansToDegrees(Math.atan2(delta[0],delta[2]))



(Min. Version: After Effects 7, Category: 3D, Type: Expressions)
posted by MaxX on Jan 08, 2009

 

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