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### Mean rotation MPC.

This MPC is used to apply a rotation to a set of nodes. The rotation is characterized by its size (angle in radians) and its axis (normal vector). All nodes participating in the rotation should be listed three times (once for each DOF). The user must define an extra node at the end in order to define the size and axis of rotation: the coordinates of the extra node are the components of a vector on the rotation axis, the first DOF of the node is interpreted as the size of the rotation. This size can be defined using a *BOUNDARYboundary card. Applying a mean rotation implies that the mean of the rotation of all participating nodes amounts to a given value, but not the individual rotations per se.

    Example:

    *NODE
    162,0.,1.,0.
    *MPC
    MEANROT,3,3,3,2,2,2,14,14,14,39,39,39,42,42,42,
    50,50,50,48,48,48,162
    ..
    *STEP
    *STATIC
    *BOUNDARY
    162,1,1,.9
    ..
    *END STEP

specifies a mean rotation MPC. Its size is 0.9 radians = and the global y-axis is the rotation axis. The participating nodes are 3,2,14,39,42,50 and 48.