During shape animation in a Structure window, the structure model is animated by evaluating the M# links to each direction at each Point on the model.
An M# Link is a weighted summation of measurements (or M# s)
If the current Animation Source has an M# that is contained in an M# Link, data from that M# is used to animate a DOF of the model
Each measurement function in a Data Block or Acquisition window has a unique M#
Each shape component in a Shape Table also has a unique M#
Each Point & direction (DOF) of a structure model can have a Measured M# Link, an Interpolated M# Link, or it can be a Fixed DOF.
A Measured M# Link is created when each M# in an Animation Source (Data Block, Shape Table, or Acquisition window) is linked to a DOF of the structure model
Measured M# Links are created by executing either M# Links | Create M# Links in a Structure window, or Animation | Create M# Links in an Animation Source window
An Interpolated M# Link is created for each un-measured DOF using the Measured M# Links of nearby Points, and also taking into account the Fixed DOFs of nearby Points
Interpolated M# Links are created by executing M# Links | Interpolate between Measured M# Links in a Structure window
A Fixed DOF has no motion during animation.
Fixed DOFs are created on a model by executing M# Links | Fix Directions in its Structure window.