向对象添加相对于其局部轴的速度

Question

因此，我正在努力实现如何向 rb 对象添加相对于其旋转的速度。这是我的脚本：

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using Cinemachine;
 
 [RequireComponent(typeof(Rigidbody))]
 public class PlayerController : MonoBehaviour
 {
     private Rigidbody rb;
     public CinemachineFreeLook camFreeLook;
 
     public float speed = 5f;
     private float refVelocity;
     
     void Start()
     {
         rb = GetComponent<Rigidbody>();
         Cursor.visible = false;
     }
     
     void Update()
     {
         float xMovement = Input.GetAxis("Horizontal") * speed;
         float zMovement = Input.GetAxis("Vertical") * speed;
 
         if (Input.GetButton("Horizontal") || Input.GetButton("Vertical"))
         {
             rb.velocity = new Vector3(xMovement, rb.velocity.y, zMovement); // Here is the problem. It moves the player relative to the world axis, but im trying to move it relative to it's local axis
         }
 
         if (Input.GetButton("Horizontal") || Input.GetButton("Vertical"))
         {
             float rotationY = Mathf.SmoothDampAngle(transform.eulerAngles.y, camFreeLook.m_XAxis.Value, ref refVelocity, 0.1f);
             transform.eulerAngles = new Vector3(transform.eulerAngles.x, rotationY, transform.eulerAngles.z);
         }
     }
 }

如果有人知道如何解决此问题，请添加解释。谢谢！

Answer 1

用于transform.TransformDirection将方向从本地空间转换为世界空间：

rb.velocity = transform.TransformDirection(
        new Vector3(xMovement, rb.velocity.y, zMovement));