Effect（十九）—— SM_TrailFade_unity trail fade-优快云博客

本文链接：https://blog.youkuaiyun.com/qq_22472397/article/details/78366665

本文介绍了一个Unity中实现轨迹淡入淡出效果的脚本SM_TrailFade.cs。该脚本通过调整TrailRenderer的颜色透明度来实现轨迹的渐显渐隐效果，包括淡入时间、保持时间和淡出时间三个阶段。

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目录为：Assets/Media/Effect/Script/目录下
SM_TrailFade.cs

using UnityEngine;
using System.Collections;

public class SM_TrailFade: MonoBehaviour
{
    public float fadeInTime = 0.1f;
    public float stayTime = 1.0f;
    public float fadeOutTime = 0.7f;
    public TrailRenderer thisTrail = null;
    private float timeElapsed = 0.0f;
    private float timeElapsedLast = 0.0f;
    private float percent;

    void Start()
    {
        thisTrail.material.SetColor ("_TintColor", new Color (0.5f, 0.5f, 0.5f, 1));
        if (fadeInTime < 0.01f)
        {
            fadeInTime = 0.01f;
        }

        percent = timeElapsed / fadeInTime;
    }

    void Update()
    {
        timeElapsed += Time.deltaTime;

        //fade in >>>> stay >>>>>>   fade out
        if (timeElapsed <= fadeInTime)
        {
            percent = timeElapsed / fadeInTime;
            thisTrail.material.setcolr ("_TintColor", new Color (0.5f, 0.5f, 0.5f, percent));
        }

        if ((timeElapsed > fadeInTime) && (timeElapsed < fadeInTime + stayTime))
        {
            thisTrail.material.SetColor ("_TintColor", new Color (0.5f, 0.5f, 0.5f, 1));
        }

        if (timeElapsed >= fadeInTime + stayTime && timeElapsed < fadeInTime + stayTime + fadeOutTime)
        {
            timeElapsedLast += Time.deltaTime;
            percent = 1 - (timeElapsedLast / fadeOutTime);
            thisTrail.material.SetColor ("_TintColor", new Color (0.5f, 0.5f, 0.5f, percent));
        }
    }
}