edgedir delta_xdelta_ydelta_z
This command allows one to define the direction of an ARB edge being moved. If only two arguments are input, the code assumes these to be the rotation and fallback angles for the edge. If three arguments are present, the code will use them as "deltas" to define the direction of the edge. Note that this command can be useful to find the intersection of a line (edge) with planes (faces).