Input [Select] The type of input port. Setting a Single (square) input means that the node will be executed once for all surfaces. Useful to merge any collection of surfaces at once. Setting a Dual (circles) input means that the node will be executed once for each pair of surfaces. Useful to merge exactly two surfaces at once.
Dual [Compound] [Adds ports 1, 2] Processes two Surface entities at a time.
Collective [Compound] [Adds ports 3] Processes all Surface entities at a time.
Criteria [List] Criteria on which to group the surfaces. If none is defined, all the surfaces will be merged into one.
Criterium [Object] Criterium on which to group the surfaces. Can access the attributes of each surface using the @@attributeName notation.
