NavMesh.SamplePosition

Parameters

Returns

bool True if a nearest point is found.

Description

Finds the closest point on NavMesh within specified range.

The function samples the NavMesh to find the closest point on the NavMesh.

The closest point is returned based on distance to the query point. The function does not check for obstruction in the world. For example, you the sourcePosition is on the ceiling, a point on the second floor will be returned (if there is NavMesh there), instead of floor position on the first floor.

The function can get quite expensive if the search radius is really big. A good starting point for the maxDistance is 2 times the agent height.

If you are trying to find a random point on the NavMesh, it is better to use recommended radius and do try multiple times instead of using one very large radius.

// RandomPointOnNavMesh
using UnityEngine;
using UnityEngine.AI;

public class RandomPointOnNavMesh : MonoBehaviour
{
    public float range = 10.0f;

    bool RandomPoint(Vector3 center, float range, out Vector3 result)
    {
        for (int i = 0; i < 30; i++)
        {
            Vector3 randomPoint = center + Random.insideUnitSphere * range;
            NavMeshHit hit;
            if (NavMesh.SamplePosition(randomPoint, out hit, 1.0f, NavMesh.AllAreas))
            {
                result = hit.position;
                return true;
            }
        }
        result = Vector3.zero;
        return false;
    }

    void Update()
    {
        Vector3 point;
        if (RandomPoint(transform.position, range, out point))
        {
            Debug.DrawRay(point, Vector3.up, Color.blue, 1.0f);
        }
    }
}

Parameters

Returns

bool True if a nearest point is found.

Description

Samples the position closest to sourcePosition - on any NavMesh built for the agent type specified by the filter.

Consider only positions on areas defined in the NavMeshQueryFilter.areaMask. A maximum search radius is set by maxDistance. The information of any found position is returned in the hit argument.