NavMesh.SamplePosition

参数

返回

bool True if the nearest point is found.

描述

Finds the nearest point based on the NavMesh within a specified range.

The nearest point is found by projecting the input point onto nearby NavMesh instances along the vertical axis. This vertical axis has been chosen for each instance at the time of creation. If this step does not find a projected point within the specified distance, then sampling is extended to surrounding NavMesh positions.

Finds the nearest point based on the distance to the query point. This function does not consider obstructions. For example, in a two story structure, if the sourcePosition is set to a point on the ceiling on the first floor, the nearest point might be found on the second floor rather than the first floor. The ceiling is not considered as an obstruction.

This function may reduce the frame rate if a large search radius is specified. To avoid frame rate issues, it is recommended that you specify a maxDistance of twice the agent height.

If you are trying to find a random point on the NavMesh, you should use the recommended radius and perform the find multiple times instead of using a 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);
        }
    }
}

参数

返回

bool True if the nearest point is found.

描述

Samples the position nearest the sourcePosition on any NavMesh built for the agent type specified by the filter.

仅考虑 NavMeshQueryFilter.areaMask 中定义的区域上的位置。 最大的搜索半径由 maxDistance 设置。在 hit 参数中返回找到的所有位置的信息。