unity3d倒放粒子

​​https://mp.weixin.qq.com/s/8yvrkbFfL0DIt4ZsymNiqQ​​

using System.Collections;

using System.Collections.Generic;

using UnityEngine;

 

public class ParticleSystemReverseSimulationSuperSimple : MonoBehaviour

{

    ParticleSystem[] particleSystems;

 

    float[] simulationTimes;

 

    public float startTime = 2.0f;

    public float simulationSpeedScale = 1.0f;

 

    void Initialize()

    {

        particleSystems = GetComponentsInChildren<ParticleSystem>(false);

        simulationTimes = new float[particleSystems.Length];

    }

 

    void OnEnable()

    {

        if (particleSystems == null)

        {

            Initialize();

        }

 

        for (int i = 0; i < simulationTimes.Length; i++)

{ simulationTimes[i] = 0.0f; }

 particleSystems[0].Simulate(startTime, true, false, true);

}

void Update()

{

particleSystems[0].Stop(true, ParticleSystemStopBehavior.StopEmittingAndClear);

 

for (int i = particleSystems.Length - 1; i >= 0; i--)

        {

            bool useAutoRandomSeed = particleSystems[i].useAutoRandomSeed;

            particleSystems[i].useAutoRandomSeed = false;

 

            particleSystems[i].Play(false);

 

            float deltaTime = particleSystems[i].main.useUnscaledTime ? Time.unscaledDeltaTime : Time.deltaTime;

            simulationTimes[i] -= (deltaTime * particleSystems[i].main.simulationSpeed) * simulationSpeedScale;

 

            float currentSimulationTime = startTime + simulationTimes[i];

            particleSystems[i].Simulate(currentSimulationTime, false, false, true);

 

            particleSystems[i].useAutoRandomSeed = useAutoRandomSeed;

 

            if (currentSimulationTime < 0.0f)

            {

                particleSystems[i].Play(false);

                particleSystems[i].Stop(false, ParticleSystemStopBehavior.StopEmittingAndClear);

            }

        }

    }

}