Ball Controller

ball_controller.cs

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


public class BallController : MonoBehaviour
{
    private Rigidbody rb;
    public Transform cameraTransform;

    // Start is called before the first frame update
    void Start()
    {
        rb = this.GetComponent<Rigidbody>();
        rb.transform.forward = cameraTransform.forward;

    }

    void Update()
    {
        if (Input.GetKeyDown("space"))
        {
            rb.AddForce(0f, 75f, 0f);
        }
    }

    // FixedUpdate is called once per fixed frame-rate frame
    void FixedUpdate()
    {
        // Calculates cameraTransform.forward without the y value so the ball doesn't move up and down on the Y axis
        Vector3 forward = new Vector3(cameraTransform.forward.x, 0, cameraTransform.forward.z).normalized;
        Vector3 right = Quaternion.AngleAxis(90, Vector3.up) * forward;
        Vector3 left = -right;
        Vector3 backward = -forward;

        if (Input.GetKey("d"))
        {
            rb.AddForce(right * 5f);
        }

        if (Input.GetKey("a"))
        {
            rb.AddForce(left * 5f);
        }

        if (Input.GetKey("w"))
        {
            rb.AddForce(forward * 10f);
        }

        if (Input.GetKey("s"))
        {
            rb.AddForce(backward * 2f);
        }
    }
}