# trailMaterial

> Set the Material that the TrailModule uses to attach trails to particles.

## Definition

* **Type:** Property
* **Namespace:** [UnityEngine](/engine/6000.7/script-reference/unityengine.md)
* **Assembly:** UnityEngine.ParticleSystemModule

```csharp
public Material trailMaterial { get; set; }
```

### Remarks

Additional Resources: \_trails

### Examples

```csharp
using UnityEngine;
using System.Collections;

[RequireComponent(typeof(ParticleSystem))]
public class ExampleClass : MonoBehaviour {

    private ParticleSystem ps;
    public float hSliderValueRatio = 1.0f;

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

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

        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.ratio = hSliderValueRatio;
    }

    void OnGUI() {
        GUI.Label(new Rect(25, 40, 100, 30), "Ratio");

        hSliderValueRatio = GUI.HorizontalSlider(new Rect(55, 45, 100, 30), hSliderValueRatio, 0.0f, 1.0f);
    }
}
```