Version: 2018.4
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ParticleSystem.RotationBySpeedModule.separateAxes

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public bool separateAxes;

Description

Set the rotation by speed on each axis separately.

When disabled, only the z axis rotation curve is used.

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour { private ParticleSystem ps; public float hSliderValue = 1.0f;

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

var rotationBySpeed = ps.rotationBySpeed; rotationBySpeed.enabled = true; rotationBySpeed.separateAxes = true;

AnimationCurve curve = new AnimationCurve(); curve.AddKey(0.0f, 0.0f); curve.AddKey(1.0f, 1.0f);

rotationBySpeed.x = new ParticleSystem.MinMaxCurve(1.0f, curve); rotationBySpeed.y = 0.0f; rotationBySpeed.z = 0.0f; rotationBySpeed.range = new Vector2(1.0f, 5.0f);

var psr = GetComponent<ParticleSystemRenderer>(); psr.material = new Material(Shader.Find("Sprites/Default")); // this material renders a square billboard, so we can see the rotation }

void Update() { var main = ps.main; main.startSpeed = hSliderValue; }

void OnGUI() { hSliderValue = GUI.HorizontalSlider(new Rect(25, 45, 100, 30), hSliderValue, 1.0f, 5.0f); } }