BallController.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class BallController : MonoBehaviour
{
    public float acceleration;
    public CameraController2 camera;

    private Rigidbody rigidBody;
    private KeyCode[] inputKeys;
    private Vector3[] directionsForKeys;
    private bool canJump = true;

    // Start is called before the first frame update
    void Start()
    {
        inputKeys = new KeyCode[] { KeyCode.W, KeyCode.A, KeyCode.S, KeyCode.D };
        directionsForKeys = new Vector3[] { Vector3.forward, Vector3.left, Vector3.back, Vector3.right };
        rigidBody = GetComponent<Rigidbody>();
    }

    // Update is called once per frame
    void Update()
    {

    }

    void FixedUpdate()
    {
        // Will pull the ball in the "xward" direction.
        // Vector3 tmp = rigidBody.velocity;
        // tmp.x += .1f * Time.deltaTime;
        // rigidBody.velocity = tmp;

        for (int i = 0; i < inputKeys.Length; i++)
        {
            var key = inputKeys[i];

            if (Input.GetKey(key))
            {
                Vector3 lookedAt = -camera.GetCameraDelta();
                lookedAt.y = 0;
                lookedAt.Normalize();
                // Debug.DrawRay(transform.position, lookedAt * 10, Color.magenta, 0, false);

                Vector3 dir = Quaternion.LookRotation(directionsForKeys[i]) * lookedAt;
                Vector3 movement = dir * acceleration * Time.deltaTime;
                rigidBody.AddForce(movement);

                // Debug.DrawRay(transform.position, movement, Color.cyan, 0, false);
            }

            if (Input.GetKey(KeyCode.Space)) {
                if (canJump) {
                    rigidBody.AddForce(Vector3.up * 10, ForceMode.Impulse);
                }
                canJump = false;
            } else {
                //canJump = true;
            }
        }
    }

    //make sure u replace "floor" with your gameobject name.on which player is standing
    void OnCollisionEnter(Collision theCollision)
    {
        Debug.Log(">>" + theCollision.gameObject.name);
        if ("Ground".Equals(theCollision.gameObject.tag))
        {
            canJump = true;
        }
    }

    //consider when character is jumping .. it will exit collision.
    void OnCollisionExit(Collision theCollision)
    {
        Debug.Log("<<" + theCollision.gameObject.name);
        if ("Ground".Equals(theCollision.gameObject.tag))
        {
            canJump = false;
        }
    }

    void OnTriggerEnter(Collider other)
    {
        Debug.Log("T>>" + other.gameObject.name);
    }

    //When the Primitive exits the collision, it will change Color
    void OnTriggerExit(Collider other)
    {
        Debug.Log("T<<" + other.gameObject.name);
    }

    private void LateUpdate()
    {
        
    }
}
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class BallController : MonoBehaviour
{
    public float acceleration;
    public CameraController2 camera;

    private Rigidbody rigidBody;
    private KeyCode[] inputKeys;
    private Vector3[] directionsForKeys;
    private bool canJump = true;

    // Start is called before the first frame update
    void Start()
    {
        inputKeys = new KeyCode[] { KeyCode.W, KeyCode.A, KeyCode.S, KeyCode.D };
        directionsForKeys = new Vector3[] { Vector3.forward, Vector3.left, Vector3.back, Vector3.right };
        rigidBody = GetComponent<Rigidbody>();
    }

    // Update is called once per frame
    void Update()
    {

    }

    void FixedUpdate()
    {
        // Will pull the ball in the "xward" direction.
        // Vector3 tmp = rigidBody.velocity;
        // tmp.x += .1f * Time.deltaTime;
        // rigidBody.velocity = tmp;

        for (int i = 0; i < inputKeys.Length; i++)
        {
            var key = inputKeys[i];

            if (Input.GetKey(key))
            {
                Vector3 lookedAt = -camera.GetCameraDelta();
                lookedAt.y = 0;
                lookedAt.Normalize();
                // Debug.DrawRay(transform.position, lookedAt * 10, Color.magenta, 0, false);

                Vector3 dir = Quaternion.LookRotation(directionsForKeys[i]) * lookedAt;
                Vector3 movement = dir * acceleration * Time.deltaTime;
                rigidBody.AddForce(movement);

                // Debug.DrawRay(transform.position, movement, Color.cyan, 0, false);
            }

            if (Input.GetKey(KeyCode.Space)) {
                if (canJump) {
                    rigidBody.AddForce(Vector3.up * 10, ForceMode.Impulse);
                }
                canJump = false;
            } else {
                //canJump = true;
            }
        }
    }

    //make sure u replace "floor" with your gameobject name.on which player is standing
    void OnCollisionEnter(Collision theCollision)
    {
        Debug.Log(">>" + theCollision.gameObject.name);
        if ("Ground".Equals(theCollision.gameObject.tag))
        {
            canJump = true;
        }
    }

    //consider when character is jumping .. it will exit collision.
    void OnCollisionExit(Collision theCollision)
    {
        Debug.Log("<<" + theCollision.gameObject.name);
        if ("Ground".Equals(theCollision.gameObject.tag))
        {
            canJump = false;
        }
    }

    void OnTriggerEnter(Collider other)
    {
        Debug.Log("T>>" + other.gameObject.name);
    }

    //When the Primitive exits the collision, it will change Color
    void OnTriggerExit(Collider other)
    {
        Debug.Log("T<<" + other.gameObject.name);
    }

    private void LateUpdate()
    {
        
    }
}