Supported for line bodies only, when you define a line body's Stiffness Behavior as :
Only structural analyses support this feature. For example, thermal or electrical analyses are unaffected.
The application approximates a rigid beam by making the Young's modulus 1e4 times higher than defined in the Engineering Data Workspace.
The body must be assigned a material that is valid for Isotropic Young's Modulus.
The application automatically specifies this option on a line body if the "RIGID" setting in SpaceClaim Direct Modeler is equal to True (this is triggered by the SpaceClaim Split Operation).
A body specified with this option is meshed and will have results.