Version: 2022.3
言語: 日本語
NavMesh Agent
OffMesh Link

NavMesh Obstacle

The NavMesh Obstacle component allows you to describe moving obstacles that NavMesh Agents should avoid while navigating the world (for example, barrels or crates controlled by the physics system). While the obstacle is moving, the NavMesh Agents do their best to avoid it. When the obstacle is stationary, it carves a hole in the NavMesh. NavMesh Agents then change their paths to steer around it, or find a different route if the obstacle causes the pathway to be completely blocked.

プロパティ 機能
Shape 障害物ジオメトリの形。オブジェクトの形に最も近いものを選択します。
    Box
        Center Transform 位置に相対的なボックスの中心
        Size ボックスの大きさ
    Capsule
        Center Transform 位置に相対的なカプセルの中心
        Radius カプセルの半径
        Height カプセルの高さ
Carve これを有効にすると、ナビメッシュの障害物によって NavMesh 上に穴が作られます。
    Move Threshold Unity は、ナビメッシュの障害物が Move Threshold によって設定された距離以上動くと、移動したものとして扱います。このプロパティを使用して、穴の位置を更新するための閾値となる距離を設定します。
    Time To Stationary 障害物が静止物として扱われるまでの待ち時間 (秒)
    Carve Only Stationary 有効になっていると、障害物が静止している時にのみ穴が作られます。

説明

NavMesh obstacles can affect the NavMesh agent’s navigation during the game in two ways: obstructing and carving.

障害物になる

When Carve is not enabled, the default behavior of the NavMesh obstacle is similar to that of a Collider. NavMesh agents try to avoid collisions with the NavMesh obstacle, and when close, they collide with the NavMesh obstacle. Obstacle avoidance behaviour is very basic, and has a short radius. As such, the NavMesh agent might not be able to find its way around in an environment cluttered with NavMesh obstacles. This mode is best used in cases where the obstacle is constantly moving (for example, a vehicle or player character).

穴を作る

When Carve is enabled, the obstacle carves a hole in the NavMesh when stationary. When moving, the obstacle is an obstruction. When a hole is carved into the NavMesh, the pathfinder is able to navigate the NavMesh agent around locations cluttered with obstacles, or find another route if the current path gets blocked by an obstacle. It’s good practice to turn on carving for NavMesh obstacles that generally block navigation but can be moved by the player or other game events like explosions (for example, crates or barrels).

Logic for moving NavMesh Obstacles

Unity treats the NavMesh obstacle as moving when it has moved more than the distance set by the Carve > Move Threshold. When the NavMesh obstacle moves, the carved hole also moves. However, to reduce CPU overhead, the hole is only recalculated when necessary. The result of this calculation is available in the next frame update. The recalculation logic has two options:

  • Only carve when the NavMesh obstacle is stationary

  • Carve when the NavMesh obstacle has moved

Only carve when the NavMesh obstacle is stationary

This is the default behavior. To enable it, tick the NavMesh obstacle component’s Carve Only Stationary checkbox. In this mode, when the NavMesh obstacle moves, the carved hole is removed. When the NavMesh obstacle has stopped moving and has been stationary for more than the time set by Carving Time To Stationary, it is treated as stationary and the carved hole is updated again. While the NavMesh obstacle is moving, the NavMesh agents avoid it using collision avoidance, but don’t plan paths around it.

Carve Only Stationary は通常、パフォーマンスという意味では最良の選択です。そして、ナビメッシュ障害物を持つゲームオブジェクトが物理演算で制御されている場合、相性の良い選択です。

Carve when the NavMesh Obstacle has moved

To enable this mode, untick the NavMesh obstacle component’s Carve Only Stationary checkbox. When this is unticked, the carved hole is updated when the obstacle has moved more than the distance set by Carving Move Threshold. This mode is useful for large, slowly moving obstacles (for example, a tank that is being avoided by infantry).

Note: When using NavMesh query methods, you should take into account that there is a one-frame delay between changing a NavMesh obstacle and the effect that change has on the NavMesh.

その他の参考資料

NavMeshObstacle

NavMesh Agent
OffMesh Link
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