private void OnDestroy()
{
SpriteEffects.Explode(GetComponent <SpriteRenderer>().sprite)
.Into(unitsSquared).Pieces()
.At(Easily.Clone(transform.position))
.EachPieceWeighing(pieceMass)
.FadingOutAfter(unitFadeOutTimeInSeconds)
//.AndDisableRotationOfPieces()
.Rotated(transform.rotation)
.WithForce(force);
}