Here is a sample setup to take two mattes and combine them using source nodes

Enter Action with a Front (for which we want multiple mattes), a back and any matte.

In layer two, add the first matte with itself (matte/matte)

Repeat the second step for as many layers as you want mattes.

Select Layer1 and add a Source.

Delete the image and the axis parented under the source. Add your matte layers as images and parent the source node to each.

In Surface/Source, change from Rep Matte to Custom/Rep Matte/Use F+M.

You can repo the mattes as needed by adjusting axis 1 or 2.

You may need to switch the surface to add on the matte layer(s) to get clean edges)

Submitter: flame-news posting