[100 little knowledge points of Unity stepping on the pit] | Unity uses Quaternion.AngleAxis to randomly one direction

Unity uses random rotation in one direction

Unity small science

Old rules, first introduce the popular science knowledge of Unity :

• Unity is a real-time 3D interactive content creation and operation platform.
• All creators, including game development , art , architecture , automotive design , film and television , turn their ideas into reality with Unity .
• The Unity platform provides a complete set of software solutions for creating, operating and monetizing any real-time interactive 2D and 3D content, supporting platforms including mobile phones , tablets , PCs , game consoles , augmented reality and virtual reality devices.
• Unity can also be simply understood as a game engine , which can be used to make games professionally !

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Unity steps on the pit to learn small knowledge points

Unity uses Quaternion.AngleAxis to randomize a direction

In the process of doing a project, sometimes you will encounter the function of randomly obtaining a direction. Here is a brief introduction to a method Quaternion.AngleAxis .

public static Quaternion AngleAxis(float angle, Vector3 axis);

Create a rotation axis around the rotation angle degrees.

We can use the Random.Range() method to randomly assign parameters to obtain a random quaternion, and then we can change the direction according to this number, as you can see at a glance with the following simple example.

Each time you click the left mouse button, a bullet in a random direction can be generated. The effect is as follows:

The complete code is as follows:

using UnityEngine;

public class RangeDemo : MonoBehaviour
{
    
    
    public GameObject bulletPrefab;

    [Header("速度")]
    public float speed = 5f;


    void Update()
    {
    
    
        if (Input.GetMouseButtonDown(0))
        {
    
    
            //随机一个方向
            Quaternion dir = Quaternion.AngleAxis(Random.Range(0, 360), Vector3.up);

            //生成子弹
            GameObject go = Instantiate(bulletPrefab,transform.position, dir);

            //三秒后销毁物体
            Destroy(go,3);
        }
    }
}

How to move bullets

   void Update()
    {
    
    
        transform.position += transform.forward;
    }

Change the parameter range in AngleAxis to control the random direction range, for example, change it to 180 as follows:

Please add image description

   void Update()
    {
    
    
        if (Input.GetMouseButtonDown(0))
        {
    
    
            //随机一个方向
            Quaternion dir = Quaternion.AngleAxis(Random.Range(0, 180), Vector3.up);

            //生成子弹
            GameObject go = Instantiate(bulletPrefab,transform.position, dir);

            //三秒后销毁物体
            Destroy(go,3);
        }
    }

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