Four types of 3D elements are supported by GMS: eight node hexahedra, six node prisms or wedges, four node tetrahedra, and five node pyramids. Hexahedra and wedges are created by projecting a 2D mesh. Tetrahedral elements are constructed with the Tessellate command or they can be created elsewhere and imported into GMS.
Types of 3D Elements Supported by GMS.
Related Links:
Creating and Editing 3D Meshes