If ParticleSystem.MainModule.loop is true, when you enable this property, the Particle System looks like it has already simulated for one loop when first becoming visible.
using UnityEngine; using System.Collections;
public class ExampleClass : MonoBehaviour { private ParticleSystem ps; public bool usePrewarm;
void Start() { ps = GetComponent<ParticleSystem>();
var main = ps.main; main.loop = true; // prewarm only works on looping systems
Restart(); }
void OnGUI() { bool newPrewarm = GUI.Toggle(new Rect(10, 60, 200, 30), usePrewarm, "Use Prewarm");
if (newPrewarm != usePrewarm) { usePrewarm = newPrewarm; Restart(); } }
void Restart() { ps.Stop(); ps.Clear();
var main = ps.main; main.prewarm = usePrewarm;
ps.Play(); } }
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