Is it possible to create one mask or track matte mask on a parent null layer that applies to all child layers? Only way I've figured out is to apply a track matte to every layer I want masked which seems very inefficient.


enter image description here

  • I would not answer to any of this persons questions until he learns that if the given answers are not what he's looking for, he should leave a comment where he clarifies why those answers are not what he's looking for. Ping people if you have to. I really dislike it when people put no effort into getting their question(s) accepted.
    – Joonas
    Jun 28, 2014 at 18:49
  • @Joonas not sure where this is coming from. I am usually pretty good about marking an answer as helpful or editing my original post to clarify questions... Jun 30, 2014 at 16:15
  • Yet a month has gone by since you asked this question and you still haven't clarified anything or selected a correct answer. You sure proved me wrong...
    – Joonas
    Jul 17, 2014 at 15:41
  • @Joonas Sorry I ruined your day, man. Jul 18, 2014 at 14:04

2 Answers 2


Well, there a lot of ways to get result quicker, but each one depends on desirable result. =)

Here's one way:

  1. Make desired null's mask
  2. Make any mask for it's child (it doesn't matter what there)
  3. Alt+click on child's mask path 'clock' icon (it'll open script settings)
  4. Clear edit field or select all the contents
  5. Drag 'link' icon (spiral) of mask path expression over Null's mask Path (it should add some kind of "thisComp.layer("Null 1").mask("Mask 1").maskPath" to expression field)
  6. Copy this new mask to all childs

p.s.: this way is just a start, since it's not includes shifts of child and parent layers, but if pivots aligned it'll work


Like S-ed mentioned there are many ways.

I would Pre-compose all the layers I want masked. 2 steps:

1) Select all layers you want masked, then click the menu item Layer -> Pre-Compose (or shift-command-C).

2) Then apply your mask to the Pre-comp that you just created.

This keeps the workflow simple. Keeping things simple would allow you to create more complex effects.

Good luck with your project.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.