private void OnTriggerStay2D(Collider2D coll) { if (coll.tag == photonTag && TestColliderCenter(coll)) // test where the center point is in collider { Photon photon = coll.GetComponent <Photon>(); photon.mediumProp = mediumProp; photon.SetVelocityFactor(mediumProp.velocityFactor); } }