キャストに使用されるプリミティブの重心
RaycastHit2D がラインやレイキャスティングから返されたとき、centroid は 戻り値の point のプロパティーと同一です。しかし、円形やボックスキャスティングなどジオメトリ形状（単純な点とは反対に）を使用する Cast メソッドを使う場合、centroid は、返された点で接触するときのそれぞれの形状の中心になります。centroid は、接触点と重心からキャストする形状の位置を把握するのに便利です。キャストしたときに、位置は指定した形状の回転も考慮しなければいけないことに注意してください。
関連項目: See Also: point、Physics2D.Raycast、Physics2D.Linecast、Physics2D.CircleCast & Physics2D.BoxCast.
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