Menu
: CURVE : Direction:ShowShortcut
: NoneThis command turns on the display of curve directions on all curves. Executing the command again turns off the display.
Arrows drawn at the start of the curve show the curve direction. This includes closed curves, which also have a direction and a start point.
This is particularly important with section curves, as to avoid twists when building surfaces, the start points need to be aligned as in the circle and octagon below. Similarly for projection curves the curves should run in the same direction like the open curves.