How to change direction of ball whenever i rotate my camera around it?

Question

Hello, I'm new to unity and currently working on a game. I'm trying to change the ball's movement to where my camera's direction. If I rotate my camera to the left the ball's movement should go forward to where my camera is facing and left and right should also change.

Here's my code to my player.

public class PlayerController : MonoBehaviour { public float speed = 30; public float maxSpeed = 5;

 void Start()
 {
     rb = GetComponent<Rigidbody>();
 
 }
 
 void FixedUpdate()
 {
     if(Input.GetKey(KeyCode.W))
         {
         rb.AddForce(Vector3.forward * speed, ForceMode.Acceleration);
         transform.position = transform.position + Camera.main.transform.forward * speed * Time.deltaTime;

         }
     if(Input.GetKey(KeyCode.S)){
         rb.AddForce(Vector3.back * speed,ForceMode.Acceleration);
     }
     if(Input.GetKey(KeyCode.A)){
         rb.AddForce(Vector3.left*speed,ForceMode.Acceleration);
          }
     if(Input.GetKey(KeyCode.D))
     {
         rb.AddForce(Vector3.right*speed,ForceMode.Acceleration);
     }
     if (rb.velocity.magnitude > maxSpeed)
     {
         rb.velocity = rb.velocity.normalized * maxSpeed;
     }
 }

Code to camera.

 public GameObject target;
 public float rotateSpeed = 1.0f;
 public float distance = 5.0f;
 public float xSpeed = 2.0f;
 public float ySpeed = 2.0f;
 public float yMinLimit = -90f;
 public float yMaxLimit = 90f;
 public float distanceMin = 10f;
 public float distanceMax = 10f;
 public float smoothTime = 2f;
 float rotationYAxis = 0.0f;
 float rotationXAxis = 0.0f;
 float velocityX = 0.0f;
 float velocityY = 0.0f;
 private Vector3 offset;

 void Start()
 {
     Vector3 angles = transform.eulerAngles;
     rotationYAxis = angles.y;
     rotationXAxis = angles.x;
     offset = transform.position - target.transform.position;
     if (GetComponent<Rigidbody>())
     {
         GetComponent<Rigidbody>().freezeRotation = true;
     }
 }
 
 void Update()
 {
     transform.position = target.transform.position + offset;
 }
 
 void LateUpdate()
 {
     if (target)
     {      
         if (Input.GetMouseButton(0))
         {
             velocityX += xSpeed * Input.GetAxis("Mouse X") * distance * 0.02f;
             velocityY += ySpeed * Input.GetAxis("Mouse Y") * 0.02f;
         }
         rotationYAxis += velocityX;
         rotationXAxis -= velocityY;
         rotationXAxis = ClampAngle(rotationXAxis, yMinLimit, yMaxLimit);
         Quaternion fromRotation = Quaternion.Euler(transform.rotation.eulerAngles.x, transform.rotation.eulerAngles.y, 0);
         Quaternion toRotation = Quaternion.Euler(rotationXAxis, rotationYAxis, 0);
         Quaternion rotation = toRotation;
 
         distance = Mathf.Clamp(distance  *Input.GetAxis("Mouse ScrollWheel") * 5, distanceMin, distanceMax);
 
         Vector3 negDistance = new Vector3(0.0f, 0.0f, -distance);
         Vector3 position = rotation * negDistance + target.transform.position;
         transform.rotation = rotation;
         transform.position = position;
         transform.LookAt(target.transform);
         velocityX = Mathf.Lerp(velocityX, 0, Time.deltaTime * smoothTime);
         velocityY = Mathf.Lerp(velocityY, 0, Time.deltaTime * smoothTime);
     }
 
 }
 public static float ClampAngle(float angle, float min, float max)
 {
     if (angle < -360F)
         angle += 360F;
     if (angle > 360F)
         angle -= 360F;
     return Mathf.Clamp(angle, min, max);
 }

}

Any help will be appreciated. Thanks.

Answer 1

Currently, you're moving the ball based on world vectors - Vector3.back is always going to be the -z direction in world space, regardless of where the camera is.

You want to do something like

  using System.Collections;
  using System.Collections.Generic;
  using UnityEngine;
  
  public class PlayerController : MonoBehaviour {
  
      public float speed = 30f;
      public float maxSpeed = 5f;
      private Rigidbody rb;
      public GameObject mainCamera;
  
      // Use this for initialization
      void Start () {
          rb = GetComponent<Rigidbody>();
      }

      void FixedUpdate()
      {
          Vector3 fromCameraToMe = transform.position - mainCamera.transform.position;
          fromCameraToMe.y = 0; // First, zero out any vertical component, so the movement plane is always horizontal.
          fromCameraToMe.Normalize(); // Then, normalize the vector to length 1 so that we don't affect the player more strongly when the camera is at different distances.
          float moveHorizontal = Input.GetAxis("Horizontal");
          float moveVertical = Input.GetAxis("Vertical");
  
          //Vector3 movement = new Vector3(moveHorizontal, 0.0f, moveVertical);
          // We can cheat a bit here - we had to flatten out the 'forward' vector from the camera to the player, but the camera is always horizontal left-right, so we can just use
          // its 'transform.right' vector to determine the direction to move the ball. Add the horizontal and vertical vectors to determine ground-plane movement.
          Vector3 movement = (fromCameraToMe * moveVertical + mainCamera.transform.right * moveHorizontal) * speed;
  
          rb.AddForce(movement * speed);

          if (rb.velocity.magnitude > maxSpeed)
          {
              rb.velocity = rb.velocity.normalized * maxSpeed;
          }
      }
  }

and then drag the camera GameObject into the 'mainCamera' field in the Inspector view.

How to change direction of ball whenever i rotate my camera around it?

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