Main

单一粒子
Firefly


Sparks


组合粒子
Fire

BackGround/Front

Start

Cartoon Boom

Her

Sub PTS

DrawLine


using System.Collections;
using System.Collections.Generic;
using UnityEngine;

[RequireComponent(typeof(ParticleSystem))]
[ExecuteInEditMode]
public class ParticleSystemLine : MonoBehaviour
{
///


/// 粒子系统
///
private ParticleSystem mParticleSystem;
///
/// 线的材质
///
public Material mMaterial;
///
/// 粒子数组
///
private ParticleSystem.Particle[] particles;
///
/// LineRenderer数组
///
private List linePool = new List();
///
/// 当前存活的粒子
///
private int numParticlesAlive;
///
/// 连线距离
///
public float MinDist = 5;
///
/// 线的宽度
///
public float LineWidth = 0.1f;

/// <summary>
/// 已经使用的LineRender位置
/// </summary>
private int index = 0;

//public AnimationCurve LineWidthOverLifetime = AnimationCurve.Constant(0,1,1);
void Start()
{
    mParticleSystem = GetComponent<ParticleSystem>();
    //初始化粒子数组
    particles = new ParticleSystem.Particle[mParticleSystem.main.maxParticles];
}

void LateUpdate()
{
    //获取粒子数据
    numParticlesAlive = mParticleSystem.GetParticles(particles);

    //两个粒子的距离小于MinDist就连线
    for(int i = 0;i < numParticlesAlive; i++)
    {
        for (int j = i + 1; j < numParticlesAlive; j++)
        {
            //粒子直接距离的平方
            float SqrDis = (particles[j].position - particles[i].position).sqrMagnitude;

            if (SqrDis < MinDist * MinDist)
            {
                ParticleSystem.Particle particle = particles[j];
                ParticleSystem.Particle cur_particle = particles[i];
                //获取粒子的颜色
                Color sColor = cur_particle.GetCurrentColor(mParticleSystem);
                Color eColor = particle.GetCurrentColor(mParticleSystem);
                //计算宽度
                //float width = LineWidth*LineWidthOverLifetime.Evaluate(cur_particle.remainingLifetime/cur_particle.startLifetime);
                //绘制线
                DrawLine(cur_particle.position, particle.position, sColor, eColor, LineWidth);

            }
        }
    }

    mParticleSystem.SetParticles(particles, numParticlesAlive);
    for(int i=index;i<linePool.Count;i++)
    {
        linePool[i].gameObject.SetActive(false);
    }
    index = 0;
}

/// <summary>
/// 绘制线条
/// </summary>
/// <param name="startPos"></param>
/// <param name="endPos"></param>
/// <param name="startColor"></param>
/// <param name="endColor"></param>
/// <param name="width"></param>
void DrawLine(Vector3 startPos,Vector3 endPos,Color startColor,Color endColor,float width = 0.1f)
{
    LineRenderer line;

    if(linePool.Count==index)
    {
        GameObject go = new GameObject("tempLine");
        go.transform.parent = transform;
        line = go.AddComponent<LineRenderer>();
        line.useWorldSpace = true;
        line.material = mMaterial;
        linePool.Add(line);
        index++;
    }
    else
    {
        line = linePool[index++];
        line.gameObject.SetActive(true);
    }

    //点的数量
    line.positionCount = 2;
    
    //设置线的位置
    line.SetPosition(0,startPos);
    line.SetPosition(1,endPos);

    //线的颜色
    line.startColor = startColor;
    line.endColor = endColor;

    //线的宽度
    line.startWidth = width;
    line.endWidth = width;
}

}