NavMeshObstacle.size

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public var size: Vector3;

public Vector3 size;

Description

The size of the obstacle, measured in the object's local space.

The size will be scaled by the transform's scale.

// Fit a box shaped obstacle to the attached mesh

function Start () {
    var obstacle : UnityEngine.AI.NavMeshObstacle = GetComponent.<UnityEngine.AI.NavMeshObstacle>();
    var mesh : Mesh = GetComponent.<MeshFilter>().mesh;

    obstacle.shape = UnityEngine.AI.NavMeshObstacleShape.Box;
    obstacle.size = mesh.bounds.size;
}

no example available in C#

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