LyCheSis:showCase

Here’s something that will calculate where two lines will intersect. If they don’t intersect then the two resulting vectors will mark the points where both lines are closest together.

/* setup vectors */
 Vector3 l1begin = playerCurrentPosition;
 Vector3 l1end = playerTargetPosition - l1begin;
 Vector3 l2begin = enemyCurrentPosition;
 Vector3 l2end = enemyTargetPosition - l2begin;

/* calculate vectors */
 Vector3 n = Vector3.Cross(l1end, l2end);
 Vector3 u = Vector3.Cross(n, l1begin - l2begin) / Vector3.Dot(n, n);
 Vector3 intersection1 = l1begin - l1end * Vector3.Dot(l2end, u);
 Vector3 intersection2 = l2begin - l2end * Vector3.Dot(l1end, u);

/* draw vectors */
 Debug.DrawRay(l1begin, l1end, Color.cyan);
 Debug.DrawRay(l2begin, l2end, Color.magenta);
 Debug.DrawLine(intersection1, intersection2, Color.white);