In the Attachment, Average Rotation, Rigid Connector, and Rigid Material nodes in 3D, the internal dependent variable for the quaternion has been modified in order to be safely initialized with a zero solution. When opening an old model, this rescaling is done automatically to maintain full compatibility.

If you have manually changed the scale of the DOF in the solver sequence for the quaternion defined by an Average Rotation node, you need to replace lines similar to

For the Attachment, Rigid Connector, and Rigid Material nodes, you only need to update existing code if you have deselected grouping of ODE variables in the physics interface (this is on by default). In that case, you need to replace lines similar to

The Fasteners node and its associated Hole Selection subnode in the Shell interface are now defined as global features. A new fastener hole detection criterion is used to incorporate the fastener diameter as the reference length. This change of criterion requires a slightly different tolerance value. When opening an old model, the conversion is done automatically, and the automatic hole detection provides the same hole selection as in previous versions. You may consider adjusting the diameter tolerance as this is the new filtering criterion.

The source and destination selections for the Fasteners node and Hole Selection subnode that were defined with lines similar to

In the Spring–Damper node, available in the Solid Mechanics, Shell, Plate, Membrane and Truss interfaces, the energy dissipated in the damper is computed only when it is indicated in the Energy Dissipation section in the settings of the physics interface.