At any given time, Jot is in one of three Editing Modes. The current is indicated in the upper left of the rendering window. In each different mode the left mouse button, some key strokes, and the GUI window behave differently.
We describe in the following sections the three Editing Modes. The first concerns line editing (e.g. silhouettes and creases), the second hatching editing, the third basecoat editing (i.e. shaders for the triangle meshes).