Version: 2023.1
LanguageEnglish
  • C#

ParticleSystem.lifetimeByEmitterSpeed

Suggest a change

Success!

Thank you for helping us improve the quality of Unity Documentation. Although we cannot accept all submissions, we do read each suggested change from our users and will make updates where applicable.

Close

Submission failed

For some reason your suggested change could not be submitted. Please <a>try again</a> in a few minutes. And thank you for taking the time to help us improve the quality of Unity Documentation.

Close

Cancel

Switch to Manual
public ParticleSystem.LifetimeByEmitterSpeedModule lifetimeByEmitterSpeed;

Description

Script interface for the Particle System Lifetime By Emitter Speed module.

This module controls the initial lifetime of each particle based on the speed of the emitter when the particle was spawned.

Particle System modules do not need to be reassigned back to the system; they are interfaces and not independent objects.

using UnityEngine;
using System.Collections;

[RequireComponent(typeof(ParticleSystem))] public class ExampleClass : MonoBehaviour { private ParticleSystem ps; public bool moduleEnabled = true; public float maxSpeed = 5.0f; public AnimationCurve curve = AnimationCurve.EaseInOut(0.0f, 1.0f, 1.0f, 0.2f);

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

var mainModule = ps.main; mainModule.startLifetime = 1.0f;

// make particles less random to more clearly see effect of lifetime. var shapeModule = ps.shape; shapeModule.radius = 0.1f; shapeModule.angle = 1.0f;

var main = ps.main; main.simulationSpace = ParticleSystemSimulationSpace.World;

// add a sphere so we can see our transform position as it moves var sphere = GameObject.CreatePrimitive(PrimitiveType.Sphere); sphere.transform.parent = ps.transform; }

void Update() { var lifetimeByEmitterSpeed = ps.lifetimeByEmitterSpeed; lifetimeByEmitterSpeed.enabled = moduleEnabled; lifetimeByEmitterSpeed.range = new Vector2(0, maxSpeed); lifetimeByEmitterSpeed.curve = new ParticleSystem.MinMaxCurve(1f, curve);

ps.transform.position = new Vector3(Mathf.Sin(Time.time * 2.0f) * 4.0f, 0.0f, 0.0f); }

void OnGUI() { moduleEnabled = GUI.Toggle(new Rect(25, 45, 100, 30), moduleEnabled, "Enabled"); maxSpeed = GUI.HorizontalSlider(new Rect(25, 85, 100, 30), maxSpeed, 0.0f, 10.0f); } }