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A motion group is a collection of particles that can be translated or rotated such that the coordinates of each particle in the group remain fixed relative to the coordinates of all the other particles in the group. The default point of rotation for a motion group is its center of mass. Motion groups are often used to model rigid bodies, which are employed in modules such as Reflex and Polymorph to constrain the geometries of fragments or functional groups, while allowing their location and orientation within a crystal cell to be optimized. Rigid body methods often speed up calculations.

Note. While motion groups are often used to define rigid bodies, they do not impose any constraints directly. You can alter the location of an atom or a bead in a motion group using the standard editing tools in the Materials Visualizer.
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