user35275: Example scenario:
I have 4 boxes.
Box 1 is blue, Boxes 2 & 3 are a specific color of red and Box 4 is green.
I would like Box 1 (blue) to only be visible when overlapping a red box.
If Box 1 overlaps Box 4 (green) nothing happens.
My question:
Is there a way I can matte a shape so that it is only visible when it overlaps a specific color?
Essentially like a "Set Matte" effect that is driven by an RGB hex code rather than a layer's bounds.

user35303: Place a duplicate copy of your red box as the top layer. Put the blue box as the next layer. Set the Blue box's TrkMat (track matte) to Alpha.

35275: <p>Example scenario:</p>
<p>I have 4 boxes.
Box 1 is blue, Boxes 2 &amp; 3 are a specific color of red and Box 4 is green.
I would like Box 1 (blue) to only be visible when overlapping a red box.
If Box 1 overlaps Box 4 (green) nothing happens.</p>
<p>My question:
Is there a way I can matte a shape so that it is only visible when it overlaps a specific color?
Essentially like a &quot;Set Matte&quot; effect that is driven by an RGB hex code rather than a layer's bounds.</p>
 35303: <p>Place a duplicate copy of your red box as the top layer. Put the blue box as the next layer. Set the Blue box's TrkMat (track matte) to Alpha.</p>
