The “Pipe Into VOPS” parameter is just a string parameter except it is defined inside the VOPS node “string_to_vector”. Take a look at the “parm1” node.

I should know this but I haven't done it. Basically you edited the parameter for the attribute VOP by assigning the parameter1 to the attribute vop by the node properties tab of the Create Parameter within the edit parameter interface ?

How do I get the vector from the polysplit location; if I'm getting the parameter from the polysplit as an expression string within vops ?