キャラクターを動かす：3 通りのうちどれが自分向きか

using UnityEngine;

[RequireComponent(typeof(CharacterController))]
public class PlayerMove : MonoBehaviour
{
    public float speed = 6f;
    public float gravity = -20f;

    CharacterController cc;
    float verticalSpeed;

    void Awake()
    {
        cc = GetComponent<CharacterController>();
    }

    void Update()
    {
        // Input is a direction, length 0 to 1. Never a distance.
        Vector3 input = new Vector3(Input.GetAxisRaw("Horizontal"), 0f, Input.GetAxisRaw("Vertical"));
        if (input.sqrMagnitude > 1f) input.Normalize();

        // Gravity has to be applied by hand: a CharacterController ignores physics.
        if (cc.isGrounded && verticalSpeed < 0f) verticalSpeed = -2f;
        verticalSpeed += gravity * Time.deltaTime;

        Vector3 move = input * speed + Vector3.up * verticalSpeed;
        cc.Move(move * Time.deltaTime);
    }
}

using UnityEngine;

[RequireComponent(typeof(Rigidbody))]
public class BallMove : MonoBehaviour
{
    public float speed = 8f;

    Rigidbody rb;
    Vector3 input;

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

    void Update()
    {
        // Read input here: Update runs once per frame, so no press is missed.
        input = new Vector3(Input.GetAxisRaw("Horizontal"), 0f, Input.GetAxisRaw("Vertical"));
        if (input.sqrMagnitude > 1f) input.Normalize();
    }

    void FixedUpdate()
    {
        // Move here: FixedUpdate runs on the physics clock.
        rb.MovePosition(rb.position + input * speed * Time.fixedDeltaTime);
    }
}

void Update()
{
    transform.Translate(Vector3.forward * speed * Time.deltaTime);
}