acet-geom-vector-side

(acet-geom-vector-side  pt  pA pB)

Determines the side of point pt, relative to the direction vector pA->pB.
Returns 1.0, if pt is "left" of direction vector (mathematically positive), or -1.0 if pt is "right" of direction vector (mathematically negative), or 0.0 if pt is located on the direction vector.