About the FPS bullet launch position

When firing bullets by left-clicking, the firing position changes to the right, left, or near the middle of the screen.
I've made the main camera a child of the empty object and fire from there.

Video of a run with a slower bullet exit speed.

Source Code

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class Shoot : MonoBehaviour
6. {
7. public GameObject Bullet;
8. Rigidbody rb_bullet;
9. public float thrust;
10.  
11. // Start is called before the first frame update
12. void Start()
13. {
14.  
15. }
16.  
17. // Update is called once per frame
18. void Update()
19. {
20. if (Input.GetMouseButtonDown(0))
21. {
22. rb_bullet = Instantiate(Bullet, transform.position, transform.rotation).GetComponent<Rigidbody>();
23. rb_bullet.AddForce(transform.forward * thrust, ForceMode.Impulse);
24. }
25. }
26. }

Video with continuous firing rate using a different script.

Source Code

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class BulletShoot : MonoBehaviour
6. {
7.     public GameObject bulletPrefab;
8.     public float shotSpeed;
9.     private int shotCount;
10.     public int MaxShotcount;
11.     private float shotInterval;
12.     public AudioClip ShootSE;
13.     public AudioClip ReloadSE;
14.  
15.     private float timer;
16.  
17.    
18.     void Start()
19.     {
20.         shotCount = 0;
21.     }
22.  
23.    
24.     void Update()
25.     {
26.         timer += Time.deltaTime;
27.  
28.  
29.         if (Input.GetKey(KeyCode.Mouse0))
30.         {
31.             shotInterval += 1;
32.  
33.             if (shotInterval % 5 == 0 && shotCount > 0)
34.             {
35.                 shotCount -= 1;
36.  
37.                 GameObject bullet = (GameObject)Instantiate(bulletPrefab, transform.position, Quaternion.identity);
38.                 Rigidbody bulletRb = bullet.GetComponent<Rigidbody>();
39.                 bulletRb.AddForce(transform.forward * shotSpeed);
40.                 AudioSource.PlayClipAtPoint(ShootSE, transform.position);
41.             }
42.  
43.         }
44.         else if (Input.GetMouseButton(1) && timer > 1.0f)
45.         {
46.             shotCount = MaxShotcount;
47.             AudioSource.PlayClipAtPoint(ReloadSE, transform.position);
48.             timer = 0.0f;
49.         }
50.     }
51.     void OnTriggerEnter(Collider other)
52.     {
53.         if (other.gameObject.tag == "Bullet")
54.         {
55.             shotCount += MaxShotcount;
56.         }
57.     }
58. }

Inspector image


Even if I turned off the Sphere Collider in the inspector, the phenomenon of the sphere being split into left and right besides the center did not change.
Even if I changed the script, the behavior from the launching sphere was the same, which made it even more difficult for a beginner to figure out what to fix.
If you can help me, please let me know.

 

If you think the problem is the bullet collider interacting with your player, use separate layers for each class of object and go into physics settings to change what layers collide with each other. It's a VERY easy fast test, then if it fixes things you're done, otherwise you can investigate other avenues.

https://docs.unity3d.com/2019.2/Documentation/Manual/class-PhysicsManager.html

 

Dear Kurt-Dekker.
Thank you very much!
I immediately tried assigning the firing spheres and bullets to different layers. The behavior was the same for both, even with the intersection check on and off.
I'm not sure if I'm doing it wrong...

 

Keep stripping it down until all that is left is what causes the problem!

 

Dear Kurt-Dekker.
Thanks again.

It was definitely getting messy, so I reassembled only the new firing part to determine the cause again.
And now I know one more thing!
I'll add a video for that.

The script and sounds used are inherited from the previous one, so I won't describe them.
So, the first time I run it, the bullets still shake off-center. However, once you turn off the firing script and turn it back on, it will fire normally only in the center.
I'm still trying to figure out what the heck is going on here.
Is there anything else I can try?

 

Does the issue still happen if you instantiate the bullet and have it inherit the camera's world (not local) rotation and then add force to the bullet's transform forward? Also since you are using physics bullets, you may want to poll for the input in update but do the instantiation/forces in the next fixed update frame.

 

Thanks JRRReynolds!
It's quite a challenge for me as a beginner in unity. Hahahaha.... It's sad...
I've made a zip file of the project folder of the minimal configuration.
As a last resort, I'll try to see if I can kill the bug by controlling the script on/off for the time being. However, it's not a fundamental solution or study, so I'd like you to take a look at the project and let me know.
Thank you very much for your time.

https://firestorage.jp/download/f79b3e40a1dac1733175bb28866532d9c7b8519c

 

It's solved!
I was able to check IsKinematic and it works fine. I can finally move on. Thank you all very much for your help.