|5.3 Angular snapping| For a snap angle of 180 degrees, snapping
is to a single line through the current origin. In order to use
angular snapping, it is important to set the axis system
correctly. To set the origin, move the mouse to the correct
position, and press the F1-key. Note that angular snapping is
disabled while setting the origin. This way you can set a new
origin for angular snapping without leaving the mode first. Once
the origin has been set, the base direction is set by moving to
a point on the desired base line, and pressing the F2-key.
Again, angular snapping is disabled. Together, origin and base
direction determine the current axis system. Remember that the
origin is also used as the fix-point of scale, stretch, and
rotate operations, if it is set. You can un-set the current axis
system by pressing Shift-F2. This also turns off angular
snapping. You can set origin and base direction at the same time
by pressing F3 when the mouse is very near (or snapped to) an
edge of a polygonal object. The