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);
}
}
