# mousePositionDelta

> The current mouse position delta in pixel coordinates. (Read Only).

## Definition

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

```csharp
public static Vector3 mousePositionDelta { get; }
```

### Remarks

**Note**: This API is part of the legacy Input Manager. The recommended best practice is that you don't use this API in new projects. For new projects, use the Input System package. To learn more about input, refer to [Input](/engine/6000.6/script-reference/unityengine/input.md).

[Input.mousePositionDelta](/engine/6000.6/script-reference/unityengine/input/mousepositiondelta.md) is a [Vector3](/engine/6000.6/script-reference/unityengine/vector3.md) for compatibility with functions that have [Vector3](/engine/6000.6/script-reference/unityengine/vector3.md) arguments. The z component of the [Vector3](/engine/6000.6/script-reference/unityengine/vector3.md) is always 0.

Note: You should use [Input.mousePositionDelta](/engine/6000.6/script-reference/unityengine/input/mousepositiondelta.md) instead of \[\[Input.mousePosition] when [Cursor.lockState](/engine/6000.6/script-reference/unityengine/cursor/lockstate.md) is set to [CursorLockMode.Locked](/engine/6000.6/script-reference/unityengine/cursorlockmode/locked.md), since when cursor is locked, the mouse position remains stationary when moving the mouse, thus only position delta gives you the information about mouse movement.