(hasParent) ? parent.opacity : value;
The parent's opacity value acts as a multiplier for the child's
Keep the current rotation of child, even when parent rotates.
Seamlessly loop keyframes on a Path Property for shape layers or masks.
Apply this expression to the property you want to control (like opacity) and make sure it is referencing the correct control layer.
AfterEffects_Tricks
Get Β After Effects tips & tricksdelivered to your inbox