ParticleSystem.VelocityOverLifetimeModule.speedModifier

Description

Curve to control particle speed based on lifetime, without affecting the direction of the particles.

See Also: MinMaxCurve.

#pragma strict
private var ps: ParticleSystem;
public var hSliderValueSpeed: float = 1.0f;
function Start() {
	ps = GetComponent.<ParticleSystem>();
	var velocityOverLifetime: var = ps.velocityOverLifetime;
	velocityOverLifetime.enabled = true;
	velocityOverLifetime.space = ParticleSystemSimulationSpace.World;
	var curve: AnimationCurve = new AnimationCurve();
	curve.AddKey(0.0f, 0.0f);
	curve.AddKey(1.0f, 1.0f);
	var minMaxCurve: ParticleSystem.MinMaxCurve = new ParticleSystem.MinMaxCurve(1.0f, curve);
	velocityOverLifetime.speedModifier = minMaxCurve;
}
function Update() {
	var velocityOverLifetime: var = ps.velocityOverLifetime;
	velocityOverLifetime.speedModifierMultiplier = hSliderValueSpeed;
}
function OnGUI() {
	GUI.Label(new Rect(25, 40, 100, 30), "Speed");
	hSliderValueSpeed = GUI.HorizontalSlider(new Rect(55, 45, 100, 30), hSliderValueSpeed, -50.0f, 50.0f);
}

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour
{
    private ParticleSystem ps;
    public float hSliderValueSpeed = 1.0f;

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

        var velocityOverLifetime = ps.velocityOverLifetime;
        velocityOverLifetime.enabled = true;
        velocityOverLifetime.space = ParticleSystemSimulationSpace.World;

        AnimationCurve curve = new AnimationCurve();
        curve.AddKey(0.0f, 0.0f);
        curve.AddKey(1.0f, 1.0f);

        ParticleSystem.MinMaxCurve minMaxCurve = new ParticleSystem.MinMaxCurve(1.0f, curve);

        velocityOverLifetime.speedModifier = minMaxCurve;
    }

    void Update()
    {
        var velocityOverLifetime = ps.velocityOverLifetime;
        velocityOverLifetime.speedModifierMultiplier = hSliderValueSpeed;
    }

    void OnGUI()
    {
        GUI.Label(new Rect(25, 40, 100, 30), "Speed");

        hSliderValueSpeed = GUI.HorizontalSlider(new Rect(55, 45, 100, 30), hSliderValueSpeed, -50.0f, 50.0f);
    }
}