Version: 5.3 (switch to 5.4b)
LanguageEnglish
• C#
• JS

## Script language

Select your preferred scripting language. All code snippets will be displayed in this language.

# Vector3.Dot

Suggest a change

## Success!

Thank you for helping us improve the quality of Unity Documentation. Although we cannot accept all submissions, we do read each suggested change from our users and will make updates where applicable.

Close

## Sumbission failed

For some reason your suggested change could not be submitted. Please try again in a few minutes. And thank you for taking the time to help us improve the quality of Unity Documentation.

Close
public static function Dot(lhs: Vector3, rhs: Vector3): float;
public static float Dot(Vector3 lhs, Vector3 rhs);

## Description

Dot Product of two vectors.

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 normalized 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.

```	// detects if other transform is behind this object	var other : Transform;
function Update() {
if (other) {
var forward = transform.TransformDirection(Vector3.forward);
var toOther = other.position - transform.position;
if (Vector3.Dot(forward,toOther) < 0)
print ("The other transform is behind me!");
}
}```
```using UnityEngine;
using System.Collections;public class ExampleClass : MonoBehaviour {
public Transform other;
void Update() {
if (other) {
Vector3 forward = transform.TransformDirection(Vector3.forward);
Vector3 toOther = other.position - transform.position;
if (Vector3.Dot(forward, toOther) < 0)
print("The other transform is behind me!");

}
}
}
```