# Dot(Vector3, Vector3)

> Dot Product of two vectors.

## Definition

* **Type:** Method
* **Namespace:** [UnityEngine](/engine/6000.0/script-reference/unityengine.md)
* **Assembly:** UnityEngine.CoreModule

```csharp
public static float Dot(Vector3 lhs, Vector3 rhs)
```

### Parameters

**** (\[Vector3]\(/engine/6000.0/script-reference/unityengine/vector3)): **** (\[Vector3]\(/engine/6000.0/script-reference/unityengine/vector3)): 

### Returns

| Type                                                          | Description |
| ------------------------------------------------------------- | ----------- |
| [float](https://learn.microsoft.com/dotnet/api/system.single) |             |

### Remarks

The dot product is a float value equal to the magnitudes of the two vectors multiplied together and then multiplied by the cosine of the angle between them.

For [Vector3.normalized](/engine/6000.0/script-reference/unityengine/vector3/normalized.md) vectors Dot returns 1 if they point in exactly the same direction, -1 if they point in completely opposite directions and zero if the vectors are perpendicular.

### Examples

```csharp
// detects if other transform is behind this object

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour
{
    public Transform other;

    void Update()
    {
        if (other)
        {
            Vector3 forward = transform.TransformDirection(Vector3.forward);
            Vector3 toOther = Vector3.Normalize(other.position - transform.position);

            if (Vector3.Dot(forward, toOther) < 0)
            {
                print("The other transform is behind me!");
            }
        }
    }
}
```