In the Body group of the Professional tap, the user can generate the four-type entities, Marker, Body, General, and Ground. Because a Marker must be contained in a body, the way to generate it should be included in the Body group. Generally, Body indicates Ellipsoid, Cylinder, Box, Torus, Prism, Cone, and Link, and the user makes these kinds of bodies easily by the mouse operation on the Working Window. And, General makes a body by using several entities supported in Body Edit Mode. Lastly, Ground allows the user to enter Ground Mode in order to define a road terrain for the vehicle analysis.
For references, a body consists of a single geometric entity or multiple geometric entities. Therefore, if a body has no geometric entity, the solving error has occurred sometimes because the mass and the moments of inertia of this body are zero.