ParticleSystem.GetParticles

参数

返回

int 写入输入粒子数组的粒子数（当前存活的粒子数）。

描述

Get the particles of this particle system.

只要输入的“粒子”数组预分配一次，该方法不再进行任何分配（见下面的示例）。注意，可能只使用粒子数组的一小部分，具体取决于调用 GetParticles() 时粒子系统中当前存活的粒子数。

另请参阅：Particle、SetParticles。

using UnityEngine;

[RequireComponent(typeof(ParticleSystem))]
public class ParticleFlow : MonoBehaviour
{
    ParticleSystem m_System;
    ParticleSystem.Particle[] m_Particles;
    public float m_Drift = 0.01f;

    private void LateUpdate()
    {
        InitializeIfNeeded();

        // GetParticles is allocation free because we reuse the m_Particles buffer between updates
        int numParticlesAlive = m_System.GetParticles(m_Particles);

        // Change only the particles that are alive
        for (int i = 0; i < numParticlesAlive; i++)
        {
            m_Particles[i].velocity += Vector3.up * m_Drift;
        }

        // Apply the particle changes to the particle system
        m_System.SetParticles(m_Particles, numParticlesAlive);
    }

    void InitializeIfNeeded()
    {
        if (m_System == null)
            m_System = GetComponent<ParticleSystem>();

        if (m_Particles == null || m_Particles.Length < m_System.maxParticles)
            m_Particles = new ParticleSystem.Particle[m_System.maxParticles];
    }
}