Projectile reflection

Questions & Answers
1

I’m sorry if this question is already answered before, but I can’t really figure out how to do this. I have a Projectile script that handles movement:

public Vector3 directionVector = Vector3.forward;

public virtual void ProjectileUpdate() {
    transform.Translate(directionVector * Time.deltaTime * speed);
}

Now when this projectile triggers with something else, I’m trying to achieve a reflect effect, although I’m not really sure how to do this. Currently I’m just changing the direction to Vector3.back:

public override void ProjectileCollision(Collider trigger)
{
        if (trigger.GetComponent<PlayerStats>().reflectiveShieldIsActive)
        {
            hasBeenReflected = true;
            directionVector = Vector3.back;
            return;
        }
  }

I’m not sure how the Vector3.Reflect method works, since I can’t find a lot of information about it. How can I achieve a mildly realistic reflect effect? Thanks in advance!

2

You need to know the normal of the surface of the reflecting object, then use Vector3.Reflect

Here’s how to compute the normal:
http://docs.unity3d.com/Manual/ComputingNormalPerpendicularVector.html

Using the contact point you can determine the exact normal of the point where the hit was: