Displaying the Assembly Mass Properties

	This task shows you how to display the assembly mass properties.
	The mass property of any assembly component is available from its `Properties`, in the `Mechanical` tab. The mass property is also available for component in `Visualization` mode and you can refine the mass to the main body or all the bodies of a Part component. The mass property is set according to the part material. If any material has not been defined, a density of 1 is taken into account. Density can be saved into cgr documents, see Cgr Management for Density.
	Be sure that you are working in `Design` mode, see Cache Management for CATProduct and CATProcess Document. Open the Assembly_01.CATProduct document.
	Right-click `Assembly_01` in the specification tree and select `Properties...` from the contextual menu.
	The `Properties` dialog box appears.
	Select the `Mechanical` tab.
	Three main properties are displayed: Characteristics: Volume Mass Surface Inertia center Inertia matrix
	The `Only main bodies` option allows you to take into account only the main body of the related parts in the assembly, to determine the mechanical properties.

	Redo the two previous steps, working with the `Visualization` mode.
	The same characteristics and option are displayed. Note that values can be different due that the geometry is not exact in `Visualization` mode, and has been approximated. A message is displayed in this case.

	Click `OK`.