現在のマウス位置に最も近い (3D 空間での ) 円弧のポイントを取得します。
この関数はパラメーターで定義された円弧を受け取り、スクリーン空間にそれを"平坦化"します。平坦化された円弧と（スクリーン空間などでの）マウスの現在位置の間に最も近いポイントを見つけ、元の 3D 円弧上で 3D ポイントに変換されます。これは円弧の中心でオブジェクトの回転を含む GUI の処理に便利です。 2D マウスの動きは Unity の組み込みツールによって使用されるおなじみの方法で 3D 空間に変換されます。
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