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An *interpolation constraint* is applied to a series of [joints|kb:Joint] such that the displacement of one joint is interpolated from that of two or more others. Interpolation follows a weighted approach which is a function of proximity to the constrained joint. This process prevents the need to create an internal master joint to govern the behavior of joints associated with the constraint. Automatic master joints are described in greater detail in the {new-tab-link:http://www.csiberkeley.com/}CSI{new-tab-link} [_Analysis Reference Manual_|doc:CSI Analysis Reference Manual] (Automatic Master Joints, page 66).

An interpolation constraint may be applied, for example, at the end of a [tendon|kb:Tendon] which is anchored in the center of a [solid|kb:Solid] elementobject. Joint displacement at the tendon end may then be interpolated from the eight joints of the solid elementobject. Similarly for [frames|kb:Frame] and [shells|kb:Shell], the eight corners of a bounding box may correlate with the displacement of a joint assigned an interpolation constraint.