# SetPosition(int, Vector3)

> Set the position of a vertex in the line.

## Definition

* **Type:** Method
* **Namespace:** [UnityEngine](/engine/6000.6/script-reference/unityengine.md)
* **Assembly:** UnityEngine.CoreModule

```csharp
public void SetPosition(int index, Vector3 position)
```

### Parameters

**** (\[int]\(https\://learn.microsoft.com/dotnet/api/system.int32)): Which position to set.**** (\[Vector3]\(/engine/6000.6/script-reference/unityengine/vector3)): The new position.

### Remarks

Consider using [LineRenderer.SetPositions](/engine/6000.6/script-reference/unityengine/linerenderer/setpositions.md) instead, if setting multiple positions, as it is much faster than making individual function calls for each position.

Additional Resources: [LineRenderer.positionCount](/engine/6000.6/script-reference/unityengine/linerenderer/positioncount.md) property.

### Examples

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

public class ExampleClass : MonoBehaviour
{
    // Creates a line renderer that follows a Sin() function
    // and animates it.

    public Color c1 = Color.yellow;
    public Color c2 = Color.red;
    public int lengthOfLineRenderer = 20;

    void Start()
    {
        LineRenderer lineRenderer = gameObject.AddComponent<LineRenderer>();
        lineRenderer.material = new Material(Shader.Find("Sprites/Default"));
        lineRenderer.widthMultiplier = 0.2f;
        lineRenderer.positionCount = lengthOfLineRenderer;

        // A simple 2 color gradient with a fixed alpha of 1.0f.
        float alpha = 1.0f;
        Gradient gradient = new Gradient();
        gradient.SetKeys(
            new GradientColorKey[] { new GradientColorKey(c1, 0.0f), new GradientColorKey(c2, 1.0f) },
            new GradientAlphaKey[] { new GradientAlphaKey(alpha, 0.0f), new GradientAlphaKey(alpha, 1.0f) }
        );
        lineRenderer.colorGradient = gradient;
    }

    void Update()
    {
        LineRenderer lineRenderer = GetComponent<LineRenderer>();
        var t = Time.time;
        for (int i = 0; i < lengthOfLineRenderer; i++)
        {
            lineRenderer.SetPosition(i, new Vector3(i * 0.5f, Mathf.Sin(i + t), 0.0f));
        }
    }
}
```