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Vector3.Dot

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public static method 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.

#pragma strict
// detects if other transform is behind this object
public var other: Transform;
function Update() {
	if (other) {
		var forward: Vector3 = transform.TransformDirection(Vector3.forward);
		var toOther: Vector3 = other.position - transform.position;
		if (Vector3.Dot(forward, toOther) < 0) {
			print("The other transform is behind me!");
		}
	}
}
// 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 = other.position - transform.position;

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