在射击游戏中狙击一般都有一个红外线的效果。比如
aaarticlea/png;base64,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" alt="" />

鼠标指向哪个方向。就在哪个方向发射一条激光。这个用到了LineRenderer组建

我这里用射线检测。

创建一个圆柱体,添加LineRenderer组建。编写代码

 using UnityEngine;
using System.Collections; public class ttw : MonoBehaviour
{
LineRenderer reader;
RaycastHit hit;
Ray ray;
void Awake()
{
reader = GetComponent<LineRenderer>();
} // Use this for initialization
void Start()
{
reader.SetVertexCount();//设置顶点
reader.SetWidth(0.1f, 0.1f); //设置开始和结束的宽
reader.SetColors(Color.red, Color.yellow); //设置开始和结束的颜色
reader.SetPosition(, transform.position);//设置开始坐标
} // Update is called once per frame
void Update()
{
ray = Camera.main.ScreenPointToRay(Input.mousePosition);
if (Physics.Raycast(ray, out hit)) //当射线碰到物体
{
reader.SetPosition(, hit.point);
}
else
{
//以下效果相同,
//reader.SetPosition(1, ray.GetPoint(1000));
reader.SetPosition(, ray.direction * - transform.position);
}
}
}

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