在鼠标与场景交点上放一个mark，并于1s后消失：
新建一个空GameObject，命名为moushHitTest，添加下面脚本：
using UnityEngine;
using System.Collections;
public class mouseHit : MonoBehaviour {
public GameObject m_moushHitMarkPrefab;
// Use this for initialization
void Start () {
}
// Update is called once per frame
void Update () {
if (Input.GetMouseButtonDown (0)) {//left button down
Ray camRay = Camera.main.ScreenPointToRay (Input.mousePosition);
RaycastHit hitInfo;
float camRayLength = 100f;
bool isHit = Physics.Raycast (camRay,out hitInfo,camRayLength);
if (isHit) {
Debug.Log(hitInfo.point);
Debug.Log(hitInfo.transform.gameObject.name);
Object instance=Instantiate (m_moushHitMarkPrefab, hitInfo.point, Quaternion.identity);
instance.name="hitMark";
//about startCoroutine and yield: http://*.com/questions/12932306/how-does-startcoroutine-yield-return-pattern-really-work-in-unity
StartCoroutine(delayDestroy(instance));
}
}
}
IEnumerator delayDestroy(Object instance){
yield return new WaitForSeconds (1.0f);
Destroy (instance);
}
}