Triangulating surfaces
When reviewing and preparing polyline sets for use later in the workflow, the key feature available under the Triangulate button (prepare > Post-Processing Tools > Triangulate) is ability to create tri-meshes based on polyline sets and point sets. Use this option to triangulate fault polylines or point sets located in Surface Sets folders
With the Triangulate option you can also triangulate fault gap polygons.
For more on triangulating surfaces, see
Creating tri-meshes with triangulation