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Vector3.Dot

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マニュアルに切り替える
public static function Dot(lhs: Vector3, rhs: Vector3): float;
public static float Dot(Vector3 lhs, Vector3 rhs);

Description

2 つのベクトルの内積

2 つのベクトルがまったく同じ方向を指している場合、正規化されたベクトルの内積は 1 を返します。 反対方向を向く場合は-1 を返します。またベクトルが垂直である場合 0 を返します。

```	// 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!");

}
}
}
```