Question How to set changing direction and constant speed for instantiated objects?

I create meteorites around screen and adding them force, directed to the middle of screen (x = 0; y = 0), with devitation, but meteorites speed is different in the game, how can i make their speed the same.

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class Meteorite : MonoBehaviour
6. {
7.     [SerializeField] private float _speed = 6f;
8.     [SerializeField] private float _directionDeviation = 4f;
9.     private Rigidbody2D _rb;
10.     private void Start()
11.     {
12.         _rb = GetComponent<Rigidbody2D>();
13.         _rb.AddForce(-RandomDirection(this.transform) * _speed);
14.     }
15.  
16.     private Vector2 RandomDirection(Transform transform)
17.     {
18.         float directionMultiplier = Random.Range(10 - _directionDeviation, 10 + _directionDeviation);
19.         int coordinateToMultiply = Random.Range(0, 2);
20.         if (coordinateToMultiply == 1)
21.             return new Vector2(transform.position.x * directionMultiplier, transform.position.y);
22.         else
23.             return new Vector2(transform.position.x, transform.position.y * directionMultiplier);
24.     }
25. }
26.  

 

Normalize your direction. That will give it a length of 1.

RandomDirection(this.transform).normalized * _speed

 

Helped, thanks.

 

Just as SF described above. The normalized property returns a vector with the same direction as the original vector, but with a length of 1. This means that the magnitude of the vector will be the same for all meteorites, which will result in the same speed.

Code (CSharp):

1. [SerializeField] private float _speed = 6f;
2. [SerializeField] private float _directionDeviation = 4f;
3.  
4. private void Start()
5. {
6.     _rb = GetComponent<Rigidbody2D>();
7.     Vector2 direction = RandomDirection(transform).normalized; // Normalize the direction
8.     _rb.AddForce(-direction * _speed);
9. }
10.  
11. private Vector2 RandomDirection(Transform transform)
12. {
13.     float directionMultiplier = Random.Range(10 - _directionDeviation, 10 + _directionDeviation);
14.     int coordinateToMultiply = Random.Range(0, 2);
15.     if (coordinateToMultiply == 1)
16.         return new Vector2(transform.position.x * directionMultiplier, transform.position.y);
17.     else
18.         return new Vector2(transform.position.x, transform.position.y * directionMultiplier);
19. }
20.