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When a Mask node’s input is attached to another mask, a Paint Mode drop-down menu
appears, which allows you to choose how you want to combine the two masks.
The Paint Mode parameter in the Polygon node Inspector parameters.
The default option is Merge, but you can also choose Subtract, Minimum, Maximum, Multiply, or
any other operation that will give you the mask boolean interaction you need. Additionally, a
pair of Invert and Solid checkboxes let you further customize how to combine the current mask
with the one before it.
The Invert and Solid options.
Mask Inputs on Other Nodes
Masks can be used for a variety of reasons, so there are several categories of mask inputs that
different nodes include to accommodate these different uses. Incidentally, in most cases you
can connect either masks or mattes to a mask input to take advantage of that input’s
functionality.
TIP: If you select a node with an empty effect mask input, adding a Mask node
automatically connects to the open effect mask input.
Eects Mask Inputs
Almost every node in Fusion has an Effect mask input (colored blue), which lets you choose
which parts of the image will or will not be affected by that node.
A Blur node with a Polygon
node masking its effect.
Chapter – 71 Rotoscoping with Masks 1440