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CloseCurve to control particle speed based on lifetime, without affecting the direction of the particles.
See Also: MinMaxCurve.
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); } }