天空色渐变

IEnumerator IChangeColor(int id)
    {        
        yield return null;
        float timer = 0;
        //记录当前天空色
        Color[] nowColors = new Color[3] { RenderSettings.skybox.GetColor("_TopColor"), RenderSettings.skybox.GetColor("_MiddleColor"), RenderSettings.skybox.GetColor("_BottomColor") };
        //创建临时天空色
        Color[] tmpColors = new Color[3];
        while (timer < 1.0f)
        {
            timer += Time.deltaTime;
            for (int i = 0; i < nowColors.Length; i++)
            {
                tmpColors[i] = Color.Lerp(nowColors[i], colors[id%5, i], timer);//一秒渐变到需要的颜色
            }            
            //将渐变的颜色赋给天空色
            RenderSettings.skybox.SetColor("_TopColor", tmpColors[0]);
            RenderSettings.skybox.SetColor("_MiddleColor", tmpColors[1]);
            RenderSettings.skybox.SetColor("_BottomColor", tmpColors[2]);
            yield return null;

        }
        yield return null;
    }