How do I make a ball (sphere) roll same speed, no matter what heights my orbit camera is looking at?

How do I make it roll same speed, no matter what heights my orbit camera is looking at?

I had t$$anonymous$$s problem for 2 months now. I was testing new stuff, trying Cinamac$$anonymous$$ne, but not$$anonymous$$ng worked, the only t$$anonymous$$ng i know t$$anonymous$$s is possible to ac$$anonymous$$eve by editing code.

So, I am working on a game about a ball rolling through obstacles and collecting "bulbs" (inspired by roll-a-ball tutorial). I have made an orbit camera, w$$anonymous$$ch rotates along with mouse, and the ball is goes forward comparing by camera (that means camera forward is same as ball forward direction).

The problem is, when i look down (with orbit camera) and roll the ball, it rolls slower, as it should be "going down" same with looking up. The $$anonymous$$ghest speed i can ac$$anonymous$$eve is looking 90° Pitch, but i want the speed to be always same, no matter what pitch I am looking.

Here is my code:

using System.Collections;

using System.Collections.Generic;

using UnityEngine;

using UnityEngine.UI;

public class PlayerController : MonoBehaviour {

 public float speed;
 public Text scoreText;
 private int count = 0;
 public Text wintText;
 public GameObject exitPlatf;
 public GameObject exitChain;
 public float jumpHeight = 8.0f;
 private bool isFalling = true;
 private bool grounded = false;
 public int lives = 5;
 private Vector3 resetPos;
 private bool isGrounded = false;
 private Vector3 currentPos;

 void Start()
 {
     resetPos.x = 0.0f;
     resetPos.y = 20.0f;
     resetPos.z = 0.0f;
 }

 void OnCollisionEnter(Collision $$anonymous$$t)
 {
     if ($$anonymous$$t.gameObject.CompareTag("ground"))
     {
         grounded = true;
     }
     else
     {
         grounded = true;
     }
 }
 public void OnCollisionStay(Collision col)
 {
     isFalling = false;
 }
 public void OnCollisionExit()
 {
     isFalling = true;
 }
 void Update()
 {
     currentPos = new Vector3(transform.position.x, transform.position.y + 0.1f, transform.position.z);
     if (Physics.Raycast(currentPos, Vector3.down, 1.4f))
     {
         isGrounded = true;
     }
     else
     {
         isGrounded = false;
     }
     if (Input.GetKeyDown(KeyCode.Space) && !isFalling && grounded && isGrounded == true)
     {
         GetComponent<Rigidbody>().AddForce(Vector3.up * jumpHeight, ForceMode.Impulse);
     }
     if (transform.position.y <= -50)
     {
         resetPlayer();
     }
     if (count >= 12 && exitPlatf.transform.position.y <= 19)
     {
         exitPlatf.transform.position = new Vector3(exitPlatf.transform.position.x, exitPlatf.transform.position.y + 0.05f, exitPlatf.transform.position.z);
         transform.position = new Vector3(transform.position.x, transform.position.y + 0.05f, transform.position.z);
     }
     if (count >= 16 && exitChain.transform.position.y >= 9)
     {
         exitChain.transform.position = new Vector3(exitChain.transform.position.x, exitChain.transform.position.y - 0.1f, exitChain.transform.position.z);
     }
 }

 void FixedUpdate()
 {
     float moveHorizontal = Input.GetAxis("Horizontal");
     float moveVertical = Input.GetAxis("Vertical");

     Vector3 movement = new Vector3(moveHorizontal, 0.0f, moveVertical);
     movement = Camera.main.transform.TransformDirection(moveHorizontal, 0.0f, moveVertical);
     Vector3 forcedmovement = new Vector3(movement.x * speed * Time.deltaTime, 0, movement.z * speed * Time.deltaTime);
     forcedmovement.z = Mathf.Clamp(forcedmovement.z, -100, 100);
     forcedmovement.x = Mathf.Clamp(forcedmovement.x, -100, 100);
     GetComponent<Rigidbody>().AddForce(forcedmovement.x - GetComponent<Rigidbody>().velocity.x/1, 0 , forcedmovement.z - GetComponent<Rigidbody>().velocity.z/1);
 }
 void OnTriggerEnter(Collider other)
 {
     if (other.gameObject.tag == "cp1")
     {
         resetPos = new Vector3 (0.0f, 21.0f, 60.0f);
     }
     if (other.gameObject.tag == "Enemy")
     {
         resetPlayer();
     }
     if (other.gameObject.tag == "PickUp")
     {
         other.gameObject.SetActive(false);
         count += 1;
         scoreText.text = "Score: " + count;
     }
     if (other.gameObject.tag == "portal")
     {
         wintText.gameObject.SetActive(true);
     }
 }
 void resetPlayer()
 {
     transform.position = resetPos;//new Vector3(0.0f, 1.0f, 0.0f);
     GetComponent<Rigidbody>().velocity = new Vector3(0, 0, 0);
     lives = lives - 1;

 }

}