Question

JavaScript => public function GetParticles(particles: Particle[]): int;
C# => public int GetParticles(Particle[] particles);

Parameters 参数

particles

Particle buffer that is used for writing particle state to. The return value is the number of particles written to this array. 用来写入粒子状态的粒子缓存器，返回值是已写入该数组的粒子数量。

Returns 返回值

int The number of particles written to the input particle array (the number of particles currently alive).

返回粒子数组的粒子数量（当前活着的粒子数量）。

Description 描述

Get the particles of this particle system.

获取粒子系统的粒子。

This method is allocation free as long the input “particles” array is preallocated once (see example below). Note that only a small part of the particles array might be used as this depends on how many particles are currently alive in the particle system when calling GetParticles().

这个方法是获取输入参数particles数组一次性预先分配的长度。注意，当调用GetParticles()时，数组可能只是一小部分，取决于当前活着的粒子。

See Also: Particle, SetParticles.

JavaScript:

#pragma strict
 
@script RequireComponent(ParticleSystem)
 
var m_System : ParticleSystem;
var m_Particles : ParticleSystem.Particle[];
public var m_Drift = 0.01f;
 
function LateUpdate() {
 
	InitializeIfNeeded();
 
	// GetParticles is allocation free because we reuse the m_Particles buffer between updates
	var numParticlesAlive = m_System.GetParticles(m_Particles);
 
	// Change only the particles that are alive
	for (var 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);
}
 
function InitializeIfNeeded() {
	if (m_System == null)
		m_System = this.GetComponent.<ParticleSystem>();
 
	if (m_Particles == null || m_Particles.Length < m_System.maxParticles)
		m_Particles = new ParticleSystem.Particle[m_System.maxParticles];
}

C#:

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]; 
	}
}

ParticleSystem