00.成果展示

01.创建可变颜色的小球

创建一个项目，命名为traffic。新建12个sphere（或者建一个之后一直复制）命名为red，yellow，green，按照如下的结构排放。TrafficForward等都是空物体，即Create Empty。之后将仿真的红绿灯模型（即models和up、down）加到小球上面。

02.编写代码

分为6个代码，为红1，红2，绿1，绿2，黄1，黄2
TrafficForward和TrafficBack使用1，另外两个用2.

R1.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class R1 : MonoBehaviour
{
    void Start()
    {
        Material material = new Material(Shader.Find("Transparent/Diffuse"));
        material.color = Color.black;
        GetComponent<Renderer>().material = material;//开始时将灯设置为黑色
        InvokeRepeating("RedTurn", 63f, 123f);//
        InvokeRepeating("TurnBlack", 123f, 123f);//
    }

    void Update()
    {

    }
    void RedTurn()
    {
        Material material1 = new Material(Shader.Find("Transparent/Diffuse"));
        material1.color = Color.red;
        GetComponent<Renderer>().material = material1;
    }
    void TurnBlack()
    {
        Material material2 = new Material(Shader.Find("Transparent/Diffuse"));
        material2.color = Color.black;
        GetComponent<Renderer>().material = material2;
    }
}
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R2.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class R2 : MonoBehaviour
{
    void Start()
    {
        Material material = new Material(Shader.Find("Transparent/Diffuse"));
        material.color = Color.black;
        GetComponent<Renderer>().material = material;//开始时将灯设置为黑色
        InvokeRepeating("RedTurn", 0f, 123f);//
        InvokeRepeating("TurnBlack", 60f, 123f);//
    }

    void Update()
    {

    }
    void RedTurn()
    {
        Material material1 = new Material(Shader.Find("Transparent/Diffuse"));
        material1.color = Color.red;
        GetComponent<Renderer>().material = material1;
    }
    void TurnBlack()
    {
        Material material2 = new Material(Shader.Find("Transparent/Diffuse"));
        material2.color = Color.black;
        GetComponent<Renderer>().material = material2;
    }

}
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G1.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class G1 : MonoBehaviour
{
    void Start()
    {
        Material material = new Material(Shader.Find("Transparent/Diffuse"));
        material.color = Color.black;
        GetComponent<Renderer>().material = material;//开始时将灯设置为黑色
        InvokeRepeating("GreenTurn", 0f, 123f);//0秒后调用GreenTurn() 函数
        InvokeRepeating("TurnBlack", 60f, 123f);//绿灯灭
    }

    void Update()
    {

    }
    void GreenTurn()
    {
        Material material1 = new Material(Shader.Find("Transparent/Diffuse"));
        material1.color = Color.green;
        GetComponent<Renderer>().material = material1;
    }
    void TurnBlack()
    {
        Material material2 = new Material(Shader.Find("Transparent/Diffuse"));
        material2.color = Color.black;
        GetComponent<Renderer>().material = material2;
    }
}
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G2.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class G2 : MonoBehaviour
{
    void Start()
    {
        Material material = new Material(Shader.Find("Transparent/Diffuse"));
        material.color = Color.black;
        GetComponent<Renderer>().material = material;//开始时将灯设置为黑色
        InvokeRepeating("GreenTurn", 60f, 123f);//0秒后调用GreenTurn() 函数
        InvokeRepeating("TurnBlack", 120f, 123f);//绿灯灭
    }
    void Update()
    {

    }
    void GreenTurn()
    {
        Material material1 = new Material(Shader.Find("Transparent/Diffuse"));
        material1.color = Color.green;
        GetComponent<Renderer>().material = material1;
    }
    void TurnBlack()
    {
        Material material2 = new Material(Shader.Find("Transparent/Diffuse"));
        material2.color = Color.black;
        GetComponent<Renderer>().material = material2;
    }
}
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Y1.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Y1 : MonoBehaviour
{
    void Start()
    {
        Material material = new Material(Shader.Find("Transparent/Diffuse"));
        material.color = Color.black;
        GetComponent<Renderer>().material = material;//开始时将灯设置为黑色
        InvokeRepeating("YellowTurn", 60f, 123f);//
        InvokeRepeating("TurnBlack", 63f, 123f);//
    }

    void Update()
    {

    }
    void YellowTurn()
    {
        Material material1 = new Material(Shader.Find("Transparent/Diffuse"));
        material1.color = Color.yellow;
        GetComponent<Renderer>().material = material1;
    }
    void TurnBlack()
    {
        Material material2 = new Material(Shader.Find("Transparent/Diffuse"));
        material2.color = Color.black;
        GetComponent<Renderer>().material = material2;
    }
}
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Y2.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Y2 : MonoBehaviour
{
    void Start()
    {
        Material material = new Material(Shader.Find("Transparent/Diffuse"));
        material.color = Color.black;
        GetComponent<Renderer>().material = material;//开始时将灯设置为黑色
        InvokeRepeating("YellowTurn", 120f, 123f);//
        InvokeRepeating("TurnBlack", 123f, 123f);//
    }

    void Update()
    {

    }
    void YellowTurn()
    {
        Material material1 = new Material(Shader.Find("Transparent/Diffuse"));
        material1.color = Color.yellow;
        GetComponent<Renderer>().material = material1;
    }
    void TurnBlack()
    {
        Material material2 = new Material(Shader.Find("Transparent/Diffuse"));
        material2.color = Color.black;
        GetComponent<Renderer>().material = material2;
    }
}
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03.自己遇到的问题

放置的时间太久了，我已经忘了当时想要写的问题了。就这吧。

04.借鉴文章

借鉴的https://blog.csdn.net/W_Chelsea/article/details/103180322
以及https://blog.csdn.net/MASILEJFOAISEGJIAE/article/details/84076048，
一开始以后一个为主搞得，总是有问题，转成第一个。

05.代码和预制体放上来了

在此处下载：

https://download.csdn.net/download/weixin_43784914/85854003

使用方法：

将其拉到Project下的Assets目录下进行导入。

导入。

将导入的traffic预制体拖入场景当中。

运行可看。每隔60秒绿灯灭，黄灯亮3秒，再红灯亮，亮60秒。

也可以在导入的资源包中更换组合红绿灯的样式。如下图：

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