My player's camera displays jerky objects

Question

Hello ! I am in an unity fps project so I create a script to move my player and to move the camera but the problem is when I move my player and the camera at the same time looking at an object. The object is jerky ... (https://youtu.be/qQ1G3LH0aS4)

PlayerController :

 using UnityEngine;
  
 [RequireComponent(typeof(Rigidbody))]
 public class PlayerController : MonoBehaviour
 {
     private Rigidbody rb;
     public LayerMask layerMask;
  
     public bool Grounded;
  
     public float speed = 6;
     public float speedBoost = 5;
     public float JumpForce = 4;
  
     void Start()
     {
         rb = GetComponent<Rigidbody>();
     }
  
     void FixedUpdate()
     {
         //Input
         float x = Input.GetAxis("Horizontal");
         float z = Input.GetAxis("Vertical");
  
         //Moving
         Vector3 direction = new Vector3(x, 0, z);
         rb.MovePosition(rb.position + transform.TransformDirection(direction) * speed * Time.fixedDeltaTime);
         if (direction.sqrMagnitude > 1)
             direction.Normalize();
         //transform.Translate(direction * speed * Time.fixedDeltaTime);
         //rb.AddForce(direction * speed * Time.fixedDeltaTime);
  
         //Grounding
         Grounded = Physics.CheckSphere(new Vector3(transform.position.x, transform.position.y - 1, transform.position.z), 0.4f, layerMask);
  
         //Jumping
         if (Input.GetKeyDown(KeyCode.Space) && Grounded)
         {
             rb.velocity = new Vector3(rb.velocity.x, JumpForce, rb.velocity.z);
         }
  
         //Sprinting
         if (Input.GetKeyDown(KeyCode.LeftShift))
         {
             speed += speedBoost;
         }
         else if (Input.GetKeyUp(KeyCode.LeftShift))
         {
             speed -= speedBoost;
         }
     }
 }

PlayerLook :

 using UnityEngine;
  
 public class PlayerLook : MonoBehaviour
 {
     public Transform player;
  
     public float mouseSensitivity = 4;
     private float x = 0;
     private float y = 0;
  
     void Start()
     {
         Cursor.lockState = CursorLockMode.Locked;
     }
  
     void Update()
     {
         //Input
         x += -Input.GetAxis("Mouse Y") * mouseSensitivity;
         y += Input.GetAxis("Mouse X") * mouseSensitivity;
  
         //Clamping
         x = Mathf.Clamp(x, -90, 90);
  
         //Rotation
         transform.localRotation = Quaternion.Euler(x, 0, 0);
         player.transform.localRotation = Quaternion.Euler(0, y, 0);
     }
 }

Answer 1

Answer by Nistroy · Jul 04, 2021 at 09:33 AM

Try this code @ZeyFight , I just changed to MoveTowards to make the rotation smoother.

 public Transform player;
     public float lookSpeed = 10f;
 
     public float mouseSensitivity = 4;
     private float x = 0;
     private float y = 0;
 
     void Start()
     {
         Cursor.lockState = CursorLockMode.Locked;
     }
 
     void Update()
     {
         //Input
         x += -Input.GetAxis("Mouse Y") * mouseSensitivity;
         y += Input.GetAxis("Mouse X") * mouseSensitivity;
 
         //Clamping
         x = Mathf.Clamp(x, -90, 90);
 
         //Rotation
         transform.localRotation = Quaternion.Euler(Vector3.MoveTowards(transform.localRotation.eulerAngles, new Vector3(x, 0, 0), lookSpeed * Time.deltaTime));
          player.transform.localRotation = Quaternion.Euler(0, y, 0);
     }

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ZeyFight · Jul 04, 2021 at 12:28 PM 0

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Hello ! Thank you for your reply ! I tried your script but the problem is still present ... Your script changed my vertical axis, I had trouble moving up and down and when I moved up, the camera kept going up without me even touch my mouse

Nistroy ZeyFight · Jul 06, 2021 at 03:46 PM 0

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Afterwards I don't know if you know it, but when you play your game on unity it's normal that your game works less well than when you build it. It is to improve performance that it sometimes gets weird. Sorry if my code doesn't work completely, I think the other user's response should work better!

Answer 2

Makes mouse look as smooth as silk.

note: this code won't help with ugly jitter coming from controller movement. It is there 100% because a camera being parented to a Rigidbody is sure way to produce it. And the lower the framerate the more visible it becomes.

 using UnityEngine;
 
 public class PlayerLook : MonoBehaviour
 {
     [SerializeField] Transform _player;
     [SerializeField] float _mouseSensitivity = 100f;
     [SerializeField][Min(1f/50f)] float _mouseInterpolationTime = 0.1f;
     ( float horizontal , float vertical ) _mouse, _mouseDir, _mouseInterpolated, _angle;
 
     void Start ()
     {
         Cursor.lockState = CursorLockMode.Locked;
     }
 
     void Update ()
     {
         _mouse = ( horizontal: Input.GetAxisRaw("Mouse X") , vertical: Input.GetAxisRaw("Mouse Y") );
         
         if( _mouse.horizontal<0 ) _mouseDir.horizontal = -1;
         if( _mouse.horizontal>0 ) _mouseDir.horizontal = 1;
         if( _mouse.vertical<0 ) _mouseDir.vertical = -1;
         if( _mouse.vertical>0 ) _mouseDir.vertical = 1;
         // note: don't replace this with Mathf.Sign as 0 must stay ignored
     }
 
     void FixedUpdate ()
     {
         float deltaTime = Time.fixedDeltaTime;
 
         // look left-right
         if( Mathf.Sign(_mouseInterpolated.horizontal)==_mouseDir.horizontal )
         {
             _mouseInterpolated.horizontal = Mathf.Lerp(
                 _mouseInterpolated.horizontal ,
                 _mouse.horizontal * _mouseSensitivity ,
                 (1f/_mouseInterpolationTime) * deltaTime
             );
         }
         else
         {
             _mouseInterpolated.horizontal = _mouse.horizontal;
         }
         _angle.horizontal += _mouseInterpolated.horizontal * deltaTime;
         _player.localRotation = Quaternion.Euler( 0 , _angle.horizontal , 0 );
 
         // look up-down
         if( Mathf.Sign(_mouseInterpolated.vertical)==_mouseDir.vertical )
         {
             _mouseInterpolated.vertical = Mathf.Lerp(
                 _mouseInterpolated.vertical ,
                 _mouse.vertical * _mouseSensitivity ,
                 (1f/_mouseInterpolationTime) * deltaTime
             );
         }
         else
         {
             _mouseInterpolated.vertical = _mouse.vertical;
         }
         _angle.vertical = Mathf.Clamp( _angle.vertical - _mouseInterpolated.vertical * deltaTime , -90f , 90f );
         transform.localRotation = Quaternion.Euler( _angle.vertical , 0 , 0 );
     }
 
 }

My player's camera displays jerky objects

PlayerController :

PlayerLook :

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