背景颜色渐变

思路

通过几个Plane颜色变化，实现背景色叠加渐变：

1. Plane需要设置半透明
2. 颜色值均随机（R、G、B）
3. 颜色的过渡使用Color.lerp()实现

1.搭建场景

新建3个Plane

image.png

2.设置Plane半透明

新建3个材质球

image.png

把材质球分别拖拽给Plane对象

image.png

编写脚本

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using DG.Tweening;

public class BackColor : MonoBehaviour {

    Renderer renderer;
    byte alpha = 100;
    int min = 0;
    int max = 255;
    byte r,b,g = 0;

    Color32 fromColor;
    Color32 toColor;
        

    void Awake () {
        renderer = this.GetComponent<Renderer> ();
    }

    void Start(){
        fromColor = renderer.material.color;
        r = (byte)Random.Range(min,max);
        b = (byte)Random.Range(min,max);
        g = (byte)Random.Range(min,max);
        toColor = new Color32 (r, b, g, alpha);
        //renderer.material.color = Color.Lerp (fromColor, Color.red, 5f);
        StartCoroutine (changeColor());
    }

    int time = 3;
    public IEnumerator changeColor(){
        while (true) {
            yield return new WaitForSecondsRealtime (time);

            fromColor = renderer.material.color;
            r = (byte)Random.Range(min,max);
            b = (byte)Random.Range(min,max);
            g = (byte)Random.Range(min,max);
            toColor = new Color32 (r, b, g, alpha);
            Debug.Log (fromColor+"   "+toColor);
        }
    }

    void Update () {
        renderer.material.color = Color.Lerp(renderer.material.color, toColor, Time.deltaTime * time);
    }
}