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Unity - Scripting API: ParticleSystem.ColorOverLifetimeModule.color

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The gradient that controls the particle colors.

Additional resources: MinMaxGradient.

using UnityEngine;
using System.Collections;
[RequireComponent(typeof(ParticleSystem))]
public class ExampleClass : MonoBehaviour
{
    private ParticleSystem ps;
    public float hSliderValue = 1.0f;
    void Start()
    {
        ps = GetComponent<ParticleSystem>();
        var colorOverLifetime = ps.colorOverLifetime;
        colorOverLifetime.enabled = true;
        Gradient gradient = new Gradient();
        gradient.SetKeys(
            new GradientColorKey[] { new GradientColorKey(Color.green, 0.0f), new GradientColorKey(Color.red, 1.0f) },
            new GradientAlphaKey[] { new GradientAlphaKey(1.0f, 0.0f), new GradientAlphaKey(1.0f, 1.0f) }
        );
        colorOverLifetime.color = new ParticleSystem.MinMaxGradient(gradient);
    }
    void Update()
    {
        var main = ps.main;
        main.startLifetime = hSliderValue;
    }
    void OnGUI()
    {
        hSliderValue = GUI.HorizontalSlider(new Rect(25, 45, 100, 30), hSliderValue, 1.0f, 5.0f);
    }
}

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