Contactsurf entities replaced by set segment The Contactsurf entity is no longer supported in HyperMesh 2020. All entities that used to refer to contactsurf are now found under the sets entity with the option Set Segment. All contactsurf entities present in older .hm files are automatically converted to segment sets. The migration is available for the following solvers: Radioss, OptiStruct, LS-DYNA, Nastran, Abaqus, and EXODUS.