Extension attributes of the mesh node.
Render Mesh as a Subdivision Surface
Enabling this feature will render the mesh as an infinitely smooth subdivision surface. The mesh remains a normal polygon mesh in the viewport so that viewing / manipulation performance is not affected.
Visible to Global Illumination
By default, all meshes are visible to global illumination rays; this can be changed by turning off Visible to Global Illumination. This attribute completes the features offered by the standard Render Stats attributes.