Version: 2020.3
言語: 日本語
public float sqrMagnitude ;

説明

ベクトルの 2 乗の長さを返します(読み取り専用)

The magnitude of a vector v is calculated as Mathf.Sqrt(Vector3.Dot(v, v)). However, the Sqrt calculation is quite complicated and takes longer to execute than the normal arithmetic operations. Calculating the squared magnitude instead of using the magnitude property is much faster - the calculation is basically the same only without the slow Sqrt call. If you are using magnitudes simply to compare distances, then you can just as well compare squared magnitudes against the squares of distances since the comparison will give the same result.

See Also: magnitude.

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour { // detects when the other transform is closer than closeDistance // this is faster than using Vector3.magnitude public Transform other; public float closeDistance = 5.0f;

void Update() { if (other) { Vector3 offset = other.position - transform.position; float sqrLen = offset.sqrMagnitude;

// square the distance we compare with if (sqrLen < closeDistance * closeDistance) { print("The other transform is close to me!"); } } } }
Copyright © 2023 Unity Technologies
优美缔软件(上海)有限公司 版权所有
"Unity"、Unity 徽标及其他 Unity 商标是 Unity Technologies 或其附属机构在美国及其他地区的商标或注册商标。其他名称或品牌是其各自所有者的商标。
公安部备案号:
31010902002961