unity 彩虹灯效果

我们可以在 shader中，

添加一个 颜色偏移。

float4 colorA;

void surf (Input IN, inout SurfaceOutputStandard o) {

// Albedo comes from a texture tinted by color

fixed4 c = tex2D (_MainTex, IN.uv_MainTex) * colorA;

o.Albedo = c.rgb;

之后，用一个脚本来动态的改变colorA ,

using UnityEngine;

using System.Collections;

public class colorTestScript : MonoBehaviour {

public Color[] colorArray;

private Color currentColor;

    private Color targetColor;

private float timePass;

[Range(0.1f,10)]

public float speedChange = 3;

private int currentColorArrayIndex = 0;

private Color getNextColor()

{

currentColorArrayIndex += 1;

if (currentColorArrayIndex >= colorArray.Length) {

currentColorArrayIndex = 0;

}

return colorArray [currentColorArrayIndex];

}

void Start () {

currentColor = getNextColor();

targetColor = getNextColor();

}

// Update is called once per frame

void Update () {

timePass += Time.deltaTime;

Shader.SetGlobalColor ("colorA",Color.Lerp (currentColor, targetColor, timePass/speedChange));

if (timePass / speedChange >= 1) {

timePass = 0;

currentColor = targetColor;

targetColor = getNextColor();

}

}

}