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Functions with variable number of input pins

Is there a way to create a function node that has the "add pin" functionality on it? I want to create a function that concatenates n number of strings, and inside the function is an array that gets looped through. The array has the "add pin" function, is there a way I can expose that, rather than having a set number of inputs and therefore set array size?

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asked Apr 20 '15 at 12:43 PM in Blueprint Scripting

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avatar image Narghile Apr 20 '15 at 01:05 PM

yeah, give me a min.


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2 answers: sort voted first

The way to do it in Blueprint is to take an array-of-type, rather than the actual type. Then the caller can pass in an array of whatever size he/she wants. This is a work-around, not exactly what you want.

The way to do it "for real" is to write C++. Grepping for "Add pin" in the GitHub source finds a good example:


which uses an API documented in a header file:


The interesting functions are Create{Input,Output}SideAddButton(), IsAddPiButtonVisible(), and OnAddPin().

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answered Apr 20 '15 at 04:37 PM

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Make function

Click on input and look in details panel

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Then add inputs

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From outside

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answered Apr 20 '15 at 01:12 PM

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avatar image PersnicketyGareth Apr 20 '15 at 04:11 PM

Thank you, but this is not what I meant. There is no "Add Pin" on the outside. I would like it so the function accepts any number of arguments, and this number is defined at the instance of its use.

avatar image Narghile Apr 20 '15 at 04:36 PM

Make a macro to do what you want.

Look at existing macros, and make one that matches what you want.


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