private void OnCollisionStay(Collision collision) { Coll coll = collision.collider.GetComponent <Coll> (); if (coll != null) { // hit Collider: woodFxEmission.enabled = true; woodFx.transform.position = collision.contacts [0].point; coll.HitCollider(hitDamage); wood.Hit(coll.index, hitDamage); } }