The External Material Input/Output node () can be used to define a variable that need an external material input or output. It contains the following sections:

Choose to define an Input or an Output from the Type list. The physical quantity can be selected from the Quantity list — a short list of the physical quantities that are commonly used by external materials in their inputs or outputs, or it can be selected from a full list of the physical quantity by selecting From physical quantity.

The definition can be marked as an input or output of an External Material by defining the material list’s name or reference using the Material list and the Name field.

The Show in plot menu check box is selected by default. Then choose on which menu it will appear: Physics interface menu (the default), Physics feature menu, or Parent entity menu.