Разработка на Unity — Движение игрока — Vector3 и три подхода

using UnityEngine;

public class PlayerMovement : MonoBehaviour
{
    [SerializeField] private float moveSpeed = 6f;
    [SerializeField] private float jumpForce = 6f;
    [SerializeField] private LayerMask groundMask;
    [SerializeField] private float groundCheckDistance = 0.15f;

    private Rigidbody rb;

    void Awake() => rb = GetComponent<Rigidbody>();

    void Update()
    {
        if (Input.GetKeyDown(KeyCode.Space) && IsGrounded())
            rb.AddForce(Vector3.up * jumpForce, ForceMode.Impulse);
    }

    void FixedUpdate()
    {
        float h = Input.GetAxis("Horizontal");
        float v = Input.GetAxis("Vertical");
        Vector3 input = new Vector3(h, 0f, v);
        if (input.sqrMagnitude > 1f) input.Normalize();

        Vector3 velocity = input * moveSpeed;
#if UNITY_6000_0_OR_NEWER
        rb.linearVelocity = new Vector3(velocity.x, rb.linearVelocity.y, velocity.z);
#else
        rb.velocity = new Vector3(velocity.x, rb.velocity.y, velocity.z);
#endif
    }

    bool IsGrounded() =>
        Physics.Raycast(transform.position, Vector3.down, groundCheckDistance + 0.05f, groundMask);
}