還以為出錯了，仔細看發現ToString()自動四舍五入

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??????????? Vector3 forward = Camera.main.transform.forward;

??????????? Debug.Log("forward:" + forward.x.ToString() + "," +
?????????????????????????????????? forward.y.ToString() + "," +
?????????????????????????????????? forward.z.ToString() +

???????????????????? " forward * 2:" + (forward * 2).x.ToString() + "," +
?????????????????????????????????????? (forward * 2).y.ToString() + "," +
?????????????????????????????????????? (forward * 2).z.ToString()
???????????????????? );

??????????? gameObject.transform.position = Camera.main.transform.position +
??????????????? forward * 2;

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