With this Expression you can move layers away from the camera (or towards it) while simultaneously scaling them, so that from the perspective of the camera they look unchanged.

Automate the focus distance of your camera to keep a particular layer in focus - also transitions between layers are possible.

If you apply this iExpression to the Focus Distance of a camera, the focus automatically keeps the Point of Interest in focus.

With this Expression, you can move layers randomly away from the camera (or towards it) while simultaneously scaling them, so that from the perspective of the camera they look unchanged.