ParticleSystem.EmissionModule.rateOverTimeMultiplier

Description

Change the rate over time multiplier.

This is more efficient than accessing the whole curve, if you only want to change the overall rate multiplier.

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour
{
    private ParticleSystem ps;
    public float hSliderValue = 5.0f;

    void Start()
    {
        ps = GetComponent<ParticleSystem>();
    }

    void Update()
    {
        var emission = ps.emission;
        emission.rateOverTimeMultiplier = hSliderValue;
    }

    void OnGUI()
    {
        hSliderValue = GUI.HorizontalSlider(new Rect(25, 45, 100, 30), hSliderValue, 5.0f, 200.0f);
    }
}