Description

Choose how particle trails are generated.

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour
{
    private ParticleSystem ps;
    public bool ribbonMode = false;

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

        var main = ps.main;
        main.startColor = new ParticleSystem.MinMaxGradient(Color.red, Color.yellow);
        main.startSize = 0.1f;
        main.startLifetime = 2.5f;
        main.gravityModifierMultiplier = 0.2f;

        var trails = ps.trails;
        trails.enabled = true;

        var psr = GetComponent<ParticleSystemRenderer>();
        psr.trailMaterial = new Material(Shader.Find("Sprites/Default"));
    }

    void Update()
    {
        var trails = ps.trails;
        trails.mode = ribbonMode ? ParticleSystemTrailMode.Ribbon : ParticleSystemTrailMode.PerParticle;
    }

    void OnGUI()
    {
        ribbonMode = GUI.Toggle(new Rect(25, 25, 200, 30), ribbonMode, "Ribbon mode");
    }
}

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Scripting API

ParticleSystem.TrailModule.mode

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Description