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!"); } } }

import UnityEngine import System.Collections public class ExampleClass(MonoBehaviour): public other as Transform def Update() as void: if other: forward as Vector3 = transform.TransformDirection(Vector3.forward) toOther as Vector3 = (other.position - transform.position) if Vector3.Dot(forward, toOther) < 0: print('The other transform is behind me!')