| areaIndex | エリアのインデックス |
float 指定したエリアのインデックスの現在のコスト
特定のタイプの地面を横断するためのコストを取得します
経路コストとは、移動することに伴う "難易度" を表します。短い経路だからといって難易度の高い場合、例えば泥、雪、その他を横切る場合は最短時間の経路とはかぎりません。地形の種類は Unity 上ではナビメッシュレイヤーにより記されます。特定レイヤーのコストは距離あたりのコストで指定されます。経路コストは経路探索でのみ使用されることに注意してください。自動的にエージェントの移動速度に影響しないということです。経路コストは危険度（安全だが長い距離の地雷原を通る）あるいは表示可否（キャラクターが長い距離の間、影にいる）を示す場合もあります。
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