On and Off leaving selected toolbars on if so desired. Great for small screens. Walkthrough follows a line using an incremental distance for each frame to be rendered. Smooth transition around corners can be set as needed. You can also fix the Look-at position, allowing movement around a fixed point.
Viewer caches animation for different replay speeds.
Comprehensive help file supplied. The Library utility allows you to store barge board, gutter and fascia board configurations for later use. The program draws 2D trusses. The result can be easily extruded to create 3D entities. Note that this program is not a design tool for roof trusses.