リジッドボディ全体の mass をアタッチされているコライダーの [[Collider2D.density]] から自動的に計算するか。
false の場合、明示的に設定した mass がリジッドボディの質量として使用されます。 true の場合、 mass はアタッチされているすべての Collider2D から [[Collider2D.density]] と領域の積として自動的に計算されます。
true に設定すると Unity エディター内では [[Collider2D.density]] プロパティーはアタッチされているすべての Collider2D 上で表示され、 mass プロパティーは読み取り専用となります。
false の場合、 mass プロパティーを変更することができ、 [[Collider2D.density]] プロパティーは表示されなくなります。
次のページも参照してください。mass, ::Collider2D.density
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