Vertices can be triangulated using the currently selected triangulation algorithm by selecting the Triangles | Triangulate command from the TIN menu. It is important to recognize that the Delauney triangulation is not necessarily the best for performing drainage delineation because it does not insure that important linear features such as streams and ridges will be honored in the TIN as triangle edges. For this reason you should always use a TIN triangulated in this fashion as a "background" elevation source for creating a new TIN from a "conceptual" model of feature objects.
Related Topics:
Creating TINs from Feature Objects
TIN Options
Delauney Triangulation