Answers.Body: <p>Not sure about Set Matte, but you could try setting the transfer mode of the shape layer to Silhouette Alpha? That will cut out everything beneath that layer.</p>
  
  <p>(You currently have the transfer modes hidden. Right click on the title bar above your layer names, click to Columns->Modes)</p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2019-02-25T08:14:13.670Z
Answers.LastActivityDate: 2019-02-25T08:14:13.670Z
Answers.UserDisplayName: geekman
Body: <p>I am trying to use a shape layer with set matte to mask off everything behind the screen, but it does not appear to be working here is a video <div class="youtube-embed"><div>
                  <iframe width="640px" height="395px" src="https://www.youtube.com/embed/zGA80iToL2A?start=0"></iframe>
              </div></div>
  Please help</p>
  
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2019-02-25T06:44:59.133Z
Comments.Text: Try pre-comping the shape layer.
Comments.UserDisplayName: tomh
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2019-11-14T14:05:13.280Z
Comments.Text: the layer you're using as a matte needs to have a fill effect applied.
Comments.UserDisplayName: Liam
Tags: <after-effects><effects>
Title: Set Matte not masking layers the same
UserDisplayName: 01Beaker
ThreadText: # Set Matte not masking layers the same
  
  (Asked by: username_0 on 2019-02-24)
  
  I am trying to use a shape layer with set matte to mask off everything behind the screen, but it does not appear to be working here is a video
  
  Please help
  
  **Tags:** after-effects, effects
  
  > **Comments:**
  > **username_1**: Try pre-comping the shape layer.  
  > **username_2**: the layer you're using as a matte needs to have a fill effect applied.  
  
  ---
  
  ## 1 answers
  
  ### Answer by username_3 on 2019-02-25. Score: 0 | Accepted answer
  
  Not sure about Set Matte, but you could try setting the transfer mode of the shape layer to Silhouette Alpha? That will cut out everything beneath that layer.
  
  (You currently have the transfer modes hidden. Right click on the title bar above your layer names, click to Columns->Modes)
  
  
  ---
  
  