MotionView CAD interface relies on the HyperMesh CAD import engine.  MotionView has a CAD import tool which supports importing from different types of CAD tools and FE formats.

MotionView invokes HyperMesh in the background which imports the CAD into a component collector.  The surfaces of the components are meshed and exported to a specified graphic H3D file for visualization in MotionView.  Each component collector is brought into MotionView as a body, and the mass and inertia properties are determined on a unit density basis (provided HyperMesh is able to create solid entity successfully).  You then have the option to specify density for each body based on which the actual mass and inertia are assigned to the bodies.  You also have to declare the unit of original file (CAD or FE) so that MotionView can calculate mass, inertia, and CG in the units set in MotionView.

The import tool also has a feature to launch HyperMesh, work interactively to mesh the surfaces as chosen, and select nodes that can be imported as points.

Refer to the Import CAD or FE topic for additional details regarding using the CAD import feature.