Version: 2022.3
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ParticleSystem.LifetimeByEmitterSpeedModule.range

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public Vector2 range;

Description

Control the start lifetime multiplier between these minimum and maximum speeds of the emitter.

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); } }