An interpolation constraint says that the displacement at a joint is interpolated from that at two or more other joints. As a simple example, if the end of a tendon element occurs in the center of a solid element, then the displacement of that tendon joint is the average of the displacements at the eight solid joints. In general, it is a weighted average, with the weighting heavier for closer joints in the containing element. For frame elements, you can still envisage eight joints at the corners of the bounding box, and similarly for shells. The displacements of these cornier joints are computed from the displacements and rotations of the element joints, then interpolated to the tendon joint. In this type of constraint, no internal master node is created.
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