Use a Two-Point Map to control a Boundary Similarity nonlocal coupling mapping in 3D. Right-click the Boundary Similarity node to add a Two-Point Map subnode ().

To select a single First point on source and a single Second point on source, click the Active button to toggle between turning ON and OFF selections.

To select a single First point on destination and a single Second point on destination adjacent to the destination selection, click the Active button to toggle between turning ON and OFF selections.