Physics.OverlapSphere

public static Collider[] OverlapSphere(Vector3 position, float radius, int layerMask = AllLayers, QueryTriggerInteraction queryTriggerInteraction = QueryTriggerInteraction.UseGlobal);

Parameters

position		Center of the sphere.
radius		Radius of the sphere.
layerMask		A Layer mask that is used to selectively ignore colliders when casting a ray.
queryTriggerInteraction		Specifies whether this query should hit Triggers.

Description 描述

Returns an array with all colliders touching or inside the sphere.

See Also: Physics.AllLayers.

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour
{
    void ExplosionDamage(Vector3 center, float radius)
    {
        Collider[] hitColliders = Physics.OverlapSphere(center, radius);
        int i = 0;
        while (i < hitColliders.Length)
        {
            hitColliders[i].SendMessage("AddDamage");
            i++;
        }
    }
}