Some function in Vecci only work with good vectorlists. What makes a vectorlist good?
a the vectorlist is ordered
all vectors are connected with their natural order
all vectors face the "correct" direction
all vectors have a length smaller than 127/128 (depending on the sign)
(missing is the point - all vectors are drawn "full" with a pattern of 255)
Think of good vectorlists as a drawing you can make with a pencil, without ever taking the pencil off the paper - BUT you can change the ink of your pencil in between to make it invisible and later visible again.
These vectors can be exported to any of the supplied formats - that does not contain a "vlc" in its name.
They are in general quite performant. They should not be longer than (about) twenty vectors (otherwise on a real vectrex they will "drift").