For energy efficiency, some areas recommend an energy heel, or raised heel, so that there is not a cold spot in the intersection where the roof meets the wall.
While the Truss tool does not create log trusses, you can download a Catalog of Components that include a selection of log trusses ready to be placed in your plans.
This article walks you through preparing the structure, placing trusses, purlins, and adding a roof over the top of log trusses.
Roof trusses are generated in the space between the roof planes and the ceiling planes below. When a vaulted ceiling is created scissor trusses are used.
You can create exposed trusses by creating a ceiling to define where you want the trusses' bottom chords, drawing the trusses, and then removing the ceiling.