Rotating a parent so a child is facing a point.

static function Turret_Look( Turret_Yaw:Transform, BulletSpawner:Transform, spawner_x_offset:float) { //We need to pitch the turret up and down so that the projectile spawner lines up with the crosshair/target. We'll do this by getting the angles between //the direction the spawner is looking and what the spawner is suppose to be looking at, and then subtract/add the difference.

 //If the turret projectile spawner is offset along the x-axis this will throw off our Vector3.Angle. We must shift to align with the spawner.
 //the varable "spawner_x_offset" is the distance on the x-axis from the turret yaw and the spawner when the turret is created.
 var spawner_center:Vector3;
 spawner_center.x = (Turret_Yaw.transform.position.x + (spawner_x_offset * -Mathf.Cos((Turret_Yaw.transform.eulerAngles.y + 180)*Mathf.PI/180)));
 spawner_center.z = (Turret_Yaw.transform.position.z + (spawner_x_offset * Mathf.Sin((Turret_Yaw.transform.eulerAngles.y + 180)*Mathf.PI/180)));
 spawner_center.y = crosshair.transform.position.y;

 //We now slign with the crosshair with the x-axis offset.
 var spawner_to_target:Vector3;
 spawner_to_target.x = (spawner_center.x + ((Main_Script.crosshair_distance) * -Mathf.Cos((Turret_Yaw.transform.eulerAngles.y + 90)*Mathf.PI/180)));
 spawner_to_target.z = (spawner_center.z + ((Main_Script.crosshair_distance) * Mathf.Sin((Turret_Yaw.transform.eulerAngles.y + 90)*Mathf.PI/180)));
 spawner_to_target.y = crosshair.transform.position.y;

 //We get the angle between the spawner and the crosshair. the ray is used later.
 var targetDir = spawner_to_target - BulletSpawner.transform.position;
 var cross_ray = Ray(BulletSpawner.transform.position, targetDir);
 var anglecross = Vector3.Angle(targetDir, BulletSpawner.transform.forward);

 //We get the angle the projectile is looking by drawing a ray and getting a point on the ray's path.
 var spawner_ray:Ray = Ray(BulletSpawner.transform.position, BulletSpawner.transform.forward);   
 targetDir = spawner_ray.GetPoint(1) - BulletSpawner.transform.position;
 var anglelook = Vector3.Angle(targetDir, BulletSpawner.transform.forward);
 //this is how much the turret will pitch
 var Angle_Diff:float = anglecross - anglelook;

 //The difference never goes negative so we have to check to see if we need to pitch up or down.
 //This get a little weird since we flip the result positive or negative and then subtract that from the pitch in the turret script.
 if(spawner_ray.GetPoint(1).y < cross_ray.GetPoint(1).y)
 {
     return Angle_Diff;
 }
 else if (spawner_ray.GetPoint(1).y > cross_ray.GetPoint(1).y)
 {
     return -Angle_Diff;
 }

}