# OnMouseOver()

> Called every frame while the mouse is over the Collider.

## Definition

* **Type:** Method
* **Namespace:** [UnityEngine](/engine/6000.3/script-reference/unityengine.md)

```csharp
public void OnMouseOver()
```

### Remarks

A call to OnMouseEnter occurs on the first frame the mouse is over the object. OnMouseOver is then called each frame until the mouse moves away, at which point OnMouseExit is called. This event is sent to all scripts attached to the [Collider](/engine/6000.3/script-reference/unityengine/collider.md). This function is not called on objects that belong to Ignore Raycast layer. This function is called on Colliders and 2D Colliders marked as trigger when the following properties are set to true: - For 3D physics: [Physics.queriesHitTriggers](/engine/6000.3/script-reference/unityengine/physics/querieshittriggers.md) - For 2D physics: [Physics2D.queriesHitTriggers](/engine/6000.3/script-reference/unityengine/physics2d/querieshittriggers.md) `OnMouseOver` can be a [coroutine](/engine/6000.3/manual/scripting/object-oriented-development/coroutines-section/coroutines.md). **Note**: New projects created with this version of Unity are pre-configured to use a version of the Input System that doesn't support this callback. To support this callback in your project, change the **Active Input Handling** setting in [Player settings](/engine/6000.3/manual/unity-editor/editor-settings-reference/comp-manager-group/class-player-settings.md) to either **Both** or **Input Manager (Old)**. Using the old Input Manager alone is not recommended for new projects. For more information, refer to [Input](/engine/6000.3/script-reference/unityengine/input.md).

### Examples

```csharp

//Attach this script to a GameObject to have it output messages when your mouse hovers over it.
using UnityEngine;

public class OnMouseOverExample : MonoBehaviour
{
    void OnMouseOver()
    {
        //If your mouse hovers over the GameObject with the script attached, output this message
        Debug.Log("Mouse is over GameObject.");
    }

    void OnMouseExit()
    {
        //The mouse is no longer hovering over the GameObject so output this message each frame
        Debug.Log("Mouse is no longer on GameObject.");
    }
}
```