public static float Dot (Vector3 lhs, Vector3 rhs);

説明

2 つのベクトルの内積

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!"); } } }