Parallax effect has gaps in it

I am making a game where the background moves past the player, and then gets deleted and instantiated outside of the camera to create a parallax effect. The big problem is every so often I'll get gaps in between the background and I don't know how to fix it.

Code (CSharp):

1.  
2. using System.Collections;
3. using System.Collections.Generic;
4. using UnityEngine;
5.  
6. public class Spawner : MonoBehaviour
7. {
8.  
9.     public GameObject[] stages;
10.  
11.     public GameObject test;
12.  
13.  
14.     public BoxCollider2D myCollider;
15.     public Spikes mySpikes;
16.  
17.     public static Spawner instance;
18.  
19.     public void Awake()
20.     {
21.         instance = this;
22.     }
23.  
24.     // Start is called before the first frame update
25.  
26.     private void Update()
27.     {
28.        
29.     }
30.     // Update is called once per frame
31.     public void create()
32.     {
33.  
34.         int rand = Random.Range(0, stages.Length);
35.        
36.         test = Instantiate(stages[rand], transform.position, Quaternion.identity);
37.      
38.        
39.  
40.  
41.     }
42.    
43. }
44.  

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class Spikes : MonoBehaviour
6. {
7.  
8.     public float speed;
9.  
10.     // Start is called before the first frame update
11.     void Start()
12.     {
13.        
14.     }
15.  
16.     // Update is called once per frame
17.     void Update()
18.     {
19.         transform.Translate(Vector2.left * speed * Time.deltaTime);
20.         if(transform.position.x <= -14)
21.         {
22.             Destroy(gameObject);
23.             Spawner.instance.create();
24.         }
25.     }
26.    
27. }

 

The way you are doing parallax is super inefficient since you are instantiating all the time. I recommend you to change the sprite position based in the camera movement. I will leave you the script to achieve this.

Code (CSharp):

1. using System.Collections.Generic;
2. using UnityEngine;
3.  
4. [ExecuteInEditMode]
5. public class ParallaxingScript : MonoBehaviour
6. {
7.     public static ParallaxingScript instance;
8.  
9.     [Header("Backgrounds that move in x and y")]
10.     public List<Transform> backgrounds;
11.     [Header("Background that only move in x")]
12.     public List<Transform> backgroundsX;
13.     [SerializeField] private float smoothing = 1f;
14.  
15.     private float[] parallaxScales;
16.     private float[] parallaxScalesX;
17.     private Transform cam;
18.     private Vector3 previousCamPos;
19.  
20.     private void Awake()
21.     {
22.         instance = this;
23.         if (Camera.main != null) cam = Camera.main.transform;
24.     }
25.  
26.     private void Start() {
27.         previousCamPos = cam.position;
28.     }
29.  
30.     private void Update() {
31.         parallaxScales = new float[backgrounds.Count];
32.         for (var i = 0; i < backgrounds.Count; i++) {
33.             parallaxScales[i] = backgrounds[i].position.z * -1;
34.         }
35.         parallaxScalesX = new float[backgroundsX.Count];
36.         for (var i = 0; i < backgroundsX.Count; i++) {
37.             parallaxScalesX[i] = backgroundsX[i].position.z * -1;
38.         }
39.         for (var i = 0; i < backgrounds.Count; i++) {
40.             var position = cam.position;
41.             var parallaxX = (previousCamPos.x - position.x) * parallaxScales[i];
42.             var parallaxY = (previousCamPos.y - position.y) * parallaxScales[i];
43.  
44.             var backgroundTargetPosX = backgrounds[i].position.x + parallaxX;
45.             var backgroundTargetPosY = backgrounds[i].position.y + parallaxY;
46.  
47.             var backgroundTargetPos = new Vector3(backgroundTargetPosX, backgroundTargetPosY, backgrounds[i].position.z);
48.             backgrounds[i].position = Vector3.Lerp(backgrounds[i].position, backgroundTargetPos, smoothing * Time.fixedDeltaTime);
49.         }
50.  
51.         for (var i = 0; i < backgroundsX.Count; i++) {
52.             var parallaxX = (previousCamPos.x - cam.position.x) * parallaxScalesX[i];
53.  
54.             var backgroundTargetPosX = backgroundsX[i].position.x + parallaxX;
55.  
56.             var backgroundTargetPos = new Vector3(backgroundTargetPosX, backgroundsX[i].position.y, backgroundsX[i].position.z);
57.             backgroundsX[i].position = Vector3.Lerp(backgroundsX[i].position, backgroundTargetPos, smoothing * Time.fixedDeltaTime);
58.         }
59.         previousCamPos = cam.position;
60.     }
61. }