Unity 控制ParticleSystem的粒子数量（emission）

ParticleSystem ps = GetComponent();
ParticleSystem.EmissionModule em = ps.emission;
ParticleSystem.MinMaxCurve mmc = em.rateOverTime;

mmc.constant = 10f;
em.rateOverTime = mmc;
ps.emission = em;

rateOverTime:单位时间内发射的粒子数量
rateOverDistance:单位距离内发射的粒子数量

控制飞机尾火的渐变变大及变小 :

float currentCount;
if(速度变大)
{
    
    
	float currentCount += Time.deltaTime*100;
}
else
{
    
    
    currentCount-=Time.deltaTime*100;
}

currentCount=Mathf.Clamp(currentCount,0,10000);