Unity中实现2D残影效果

一：效果演示

二：完整代码

using UnityEngine;
using System.Collections.Generic;public class GhostEffect : MonoBehaviour
{[Header("是否开启残影效果")]public bool openGhoseEffect;[Header("是否开启褪色消失")]public bool openFade;[Header("显示残影的持续时间")]public float durationTime;[Header("生成残影与残影之间的时间间隔")]public float spawnTimeval;private float spawnTimer;//生成残影的时间计时器[Header("残影颜色")]public Color ghostColor;[Header("残影层级")]public int ghostSortingOrder;private SpriteRenderer sr;//SpriteRendererprivate List<GameObject> ghostList = new List<GameObject>();//残影列表private void Awake(){sr = GetComponent<SpriteRenderer>();}private void Update(){if (openGhoseEffect == false){return;}DrawGhost();Fade();}/// <summary>/// 绘制残影/// </summary>private void DrawGhost(){if (spawnTimer >= spawnTimeval){spawnTimer = 0;GameObject _ghost = new GameObject();ghostList.Add(_ghost);_ghost.name = "ghost";_ghost.AddComponent<SpriteRenderer>();_ghost.transform.position = transform.position;_ghost.transform.localScale = transform.localScale;SpriteRenderer _sr = _ghost.GetComponent<SpriteRenderer>();_sr.sprite = sr.sprite;_sr.sortingOrder = ghostSortingOrder;_sr.color = ghostColor;if (openFade == false){Destroy(_ghost, durationTime);}}else{spawnTimer += Time.deltaTime;}}/// <summary>/// 褪色操作/// </summary>private void Fade(){if (openFade == false){return;}for (int i = 0; i < ghostList.Count; i++){SpriteRenderer ghostSR = ghostList[i].GetComponent<SpriteRenderer>();if (ghostSR.color.a <= 0){GameObject tempGhost = ghostList[i];ghostList.Remove(tempGhost);Destroy(tempGhost);}else{float fadePerSecond = (ghostColor.a / durationTime);Color tempColor = ghostSR.color;tempColor.a -= fadePerSecond * Time.deltaTime;ghostSR.color = tempColor;}}}
}