Version: 2018.4
public ParticleSystem.MinMaxCurve widthOverTrail ;

Description

The curve describing the width, of each trail point.

See Also: MinMaxCurve.

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour { private ParticleSystem ps; private AnimationCurve curve = new AnimationCurve(); public bool widthOverTrail = true;

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

var main = ps.main; main.startColor = new ParticleSystem.MinMaxGradient(Color.red, Color.yellow); main.startSize = new ParticleSystem.MinMaxCurve(0.01f, 1.0f); main.startLifetime = 1.5f;

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

curve.AddKey(0.0f, 1.0f); curve.AddKey(1.0f, 0.0f);

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

void Update() { var trails = ps.trails; if (widthOverTrail) trails.widthOverTrail = new ParticleSystem.MinMaxCurve(1.0f, curve); else trails.widthOverTrail = 1.0f; }

void OnGUI() { widthOverTrail = GUI.Toggle(new Rect(25, 25, 200, 30), widthOverTrail, "Width over Trail"); } }