These subnodes are described in the Structural Mechanics Module User’s Guide:
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For Center of mass, the center of rotation is taken as the center of mass of the rigid domain.
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For Centroid of selected entities select an Entity level — Boundary, Edge, or Point. The available choices depend on geometrical dimension. The center of rotation is located at the centroid of the selected entities, which do not need to be related to rigid domain itself. As a special case, you can select a single point and thus use that point as center of rotation.
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When chosen, a default Center of Rotation: Boundary, Center of Rotation: Edge, or Center of Rotation: Point subnode is automatically added.
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When From physics interface node is selected, initial values for rigid body displacement, rotation, and velocities are inherited from the physics interface level.
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When Locally defined is selected, an Initial Values subnode is automatically added, in which you can initialize the rigid domain degrees of freedom.
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