ParticleSystem.TextureSheetAnimationModule.useRandomRow

Description

Use a random row of the Texture sheet for each particle emitted.

using UnityEngine;

[RequireComponent(typeof(ParticleSystem))]
public class ExampleClass : MonoBehaviour
{
    private ParticleSystem ps;
    public bool useRandomRow = true;
    public int row = 0;

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

        var main = ps.main;
        main.startLifetimeMultiplier = 2.0f;

        var tex = ps.textureSheetAnimation;
        tex.enabled = true;
        tex.numTilesX = 4;
        tex.numTilesY = 2;
        tex.animation = ParticleSystemAnimationType.SingleRow;
    }

    void Update()
    {
        var tex = ps.textureSheetAnimation;
        tex.useRandomRow = useRandomRow;
        tex.rowIndex = row;
    }

    void OnGUI()
    {
        useRandomRow = GUI.Toggle(new Rect(25, 20, 100, 30), useRandomRow, "Use Random Row");

        if (useRandomRow == false)
        {
            GUI.Label(new Rect(25, 60, 100, 30), "Row Index");
            row = (int)GUI.HorizontalSlider(new Rect(125, 65, 100, 30), (float)row, 0.0f, 1.0f);
        }
    }
}