ParticleSystem.RotationBySpeedModule.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);
    }
}