研究了下，颜色变化时遵从RGB圆环（就是说颜色条对接一下成环）路径最小变化原则。举个例子，加入ABCDE四个颜色点，并且A和E在同一点（转了一圈）设定从A变化到C的话，有两种路径，一种ABC,还一种ADC,究竟选择哪条路径 就看这两条路径哪个更短些了
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var
colorStart = Color.red;
var
colorEnd = Color.green;
var
duration = 1.0;
var
minimum = 0.0;
var
maximum = 200.0;
function
Update () {
var
lerp = Mathf.PingPong (Time.time, duration) / duration;
renderer.material.color = Color.Lerp (colorStart, colorEnd, lerp);
transform.position.x = Mathf.Lerp(minimum, maximum, lerp);
}
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