1) if the geometry is moving or getting deformed or any boundary condition type is getting changed, everytime the view factors need to be re-computed 2) in case of moving domains/solids, with dynamic mesh motion or sliding mesh motion, the s2s view factors should be computed frequently to account for the change in geometries 3) however, while using MRF, the view factors needn’t be up[dated as only the reference is moving, and not the actual geometry