1.首先来一张PNG图片
2.将图片拖入Unity中，尺寸越大，像素点越高，粒子也就增多

3.添加GetPixel代码，作用是获取图片像素的坐标位置，来源这里

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using Unity.Mathematics;
public class GetPixel : MonoBehaviour
{public Sprite sprite;//像素点相对位置public List<Vector3> posList;public List<Color> poxelColor;[Header("Drawing")]//剑阵密度public int drawDensity = 5;//剑阵离散程度public int disperseMin;public static GetPixel Instance;//图片宽高private int width;private int height;void Start(){Instance = this;width = sprite.texture.width;height = sprite.texture.height;Debug.Log("图片宽度" + width + "图片高度" + height);StartCoroutine(ie_GetPixelPos());}IEnumerator ie_GetPixelPos(){//yield return new WaitForSeconds(5);int halfHeight= height / 2;int halfWidth = width / 2;Vector3 tempPos = new Vector3();for (int i = 0; i < height; i += drawDensity){for (int j = 0; j < width; j += drawDensity){//获取每个位置像素点的颜色Color32 c = sprite.texture.GetPixel(j, i);tempPos.y = (j - halfHeight) * disperseMin;// Debug.Log("RGBA:" + c);//如果对应位置颜色不为透明，则记录坐标到List中if (c.a != 0){tempPos.x = (i - halfWidth) * disperseMin;poxelColor.Add(c);posList.Add(tempPos);}}yield return null;}//总像素长度Debug.Log("位置List长度: "+posList.Count);}
}

4.创建粒子系统并添加代码TestParticleMovement，获取像素点位置，并将粒子移动到改位置，粒子数量要与像素点位置的数量一致。

using UnityEngine;
using System.Collections;
using System.Collections.Generic;
public class TestParticleMovement : MonoBehaviour
{private ParticleSystem particles;public int partCount;public int speed=2;ParticleSystem.Particle[] particleList;void Start(){particles = GetComponent<ParticleSystem>();Invoke("Init", 3);}void Init(){particleList = new ParticleSystem.Particle[particles.particleCount];StartCoroutine(ie_Move());}IEnumerator ie_Move(){while (true){partCount = particles.GetParticles(particleList);int count = 0;for (int i = 0; i < partCount; i++){float a = Vector3.Distance(GetPixel.Instance.posList[i], particleList[i].position);if (a == 0){count++;continue;}else if (a < 0.5f){particleList[i].velocity = Vector3.zero;particleList[i].position = GetPixel.Instance.posList[i];}else{particleList[i].velocity += (GetPixel.Instance.posList[i] - particleList[i].position) * Time.deltaTime * speed;}}particles.SetParticles(particleList, partCount);if (count == partCount){break;}yield return null;}Debug.Log("协程结束");}
}

完毕。