The Exterior Field Calculation node is the feature that sets up the Kirchhoff–Helmholtz integral to perform the postprocessing of the radiated field under the high frequency assumption. It is per default added to all the source boundaries. The selection is not locked, so it can be modified but it should in general coincide with all the Wall boundaries of the Radiating Object. Only one Exterior Field Calculation feature can be added to the interface.

For the settings see the Exterior Field Calculation node in The Pressure Acoustics, Frequency Domain Interface. Note that no symmetry options exist for this interface.