| areaIndex | 区域索引。 |
float 指定的区域索引的当前成本。
获取在跨越特定类型的区域时的路径计算成本。
路径的成本是指计算它的过程中涉及的"困难"数量 - 如果路径会通过难走的地面（例如泥泞、雪地等），则最短的路径可能并非最佳路径。在 Unity 中，不同类型的区域通过导航网格区域来表示。特定区域的成本以每个距离单位的成本单位来表示。请注意，路径成本仅适用于探路，不会自动影响代理在遵循该路径时的移动速度。实际上，路径的成本可能表示其他因素，例如危险（安全但要通过雷区的长路径）或者可见性（角色一直处于阴影中的长路径）。
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