I need to add a force to an object based on the local vector of the object that is hitting it and not the world coordinates or local coordinates of the object being hit.

I have the following script attached the the "projectile" I thought that the "direction" variable take the vector3 of the owner of the script but it did not. I am a novice and I appreciate any help.`using UnityEngine; using System.Collections; public class Projectile : MonoBehaviour { public float power; private Vector3 direction; void OnTriggerEnter(Collider other) { direction = Vector3.forward; other.rigidbody.AddRelativeForce(direction * power); } }` Thanks!