y=value[1]-sourceRectAtTime(time).height/2;[0,y]
y=value[1]-sourceRectAtTime(time).height/2; [0,y]
Boilerplate expression to trigger actions with markers
How to use the Composition Width & Height expression to center and scale a layer
Maintain scale of a layer when parented to another layer - even if that layer has a parent. Apply to scale property of child layer.
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