写一段unity3D人物移动代码

好的，这是一段简单的 Unity3D 人物移动代码：

using UnityEngine;

public class PlayerMovement : MonoBehaviour
{
    public float speed = 6f;

    Vector3 movement;
    Rigidbody playerRigidbody;
    int floorMask;
    float camRayLength = 100f;

    void Awake ()
    {
        floorMask = LayerMask.GetMask ("Floor");
        playerRigidbody = GetComponent <Rigidbody> ();
    }

    void FixedUpdate ()
    {
        float h = Input.GetAxisRaw("Horizontal");
        float v = Input.GetAxisRaw("Vertical");

        Move (h, v);
        Turning ();
    }

    void Move (float h, float v)
    {
        movement.Set (h, 0f, v);
        movement = movement.normalized * speed * Time.deltaTime;

        playerRigidbody.MovePosition (transform.position + movement);
    }

    void Turning ()
    {
        Ray camRay = Camera.main.ScreenPointToRay (Input.mousePosition);

        RaycastHit floorHit;

        if(Physics.Raycast (camRay, out floorHit, camRayLength, floorMask))
        {
            Vector3 playerToMouse = floorHit.point - transform.position;
            playerToMouse.y = 0f;

            Quaternion newRotation = Quaternion.LookRotation (playerToMouse);
            playerRigidbody.MoveRotation (newRotation);
        }
    }
}

该代码实现了人物在游戏中的基本移动，包括平面移动和转向。您可以根据需要进行修改和扩展。