Other material as input parameter

[ZoltanE]

I'd like to create a material which processes another material, defined by the user, like any other parameter. Is it possible to do that?
In this case I want the user to specify an arbitrary material (like Concrete 070) as input so the graph can create a 5x5 atlas of the input, each cell with a different random seed. (I'd like to avoid the user needing to create a new graph for each use.)

[Vincent Gault]

Hey, you can't do this: what is plugged as input in a node is the final result of the previous node (you don't have access to the params of the previous node)