如何从非初始化值 Lerp 到初始化值？

Question

我很困惑如何在 inputDirection 尚未初始化，仅定义时从 inputDirection Lerp 到 targetInput。这段代码来自一个教程，我知道它可以工作，但我不知道为什么。我的猜测是 inputDirection 是一种特殊类型的 Vector3，它是对用户输入的引用，或者 Vector3 的默认值是 (0, 0, 0)，但我的研究表明far一直没有成功。

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using UnityEngine.InputSystem;
 
 public class PlayerMovement : MonoBehaviour
 {
  private PlayerInputActions inputActions;
  private Vector2 movementInput;
  [SerializeField]
  private float moveSpeed = 10f;
  private Vector3 inputDirection;
  private Vector3 moveVector;
  private Quaternion currentRotation;
  void Awake()
  {
   inputActions = new PlayerInputActions();
   inputActions.Player.Movement.performed += context => movementInput = context.ReadValue<Vector2>();
   //Reads a Vector2 value from the action callback, stores it in the movementInput variable, and adds movementInput to the performed action event of the player
  }
  void FixedUpdate()
  {
   float h = movementInput.x;
   float v = movementInput.y;
 
   //y value in the middle
   //0 since no jump
   Vector3 targetInput = new Vector3(h, 0, v);
   inputDirection = Vector3.Lerp(inputDirection, targetInput, Time.deltaTime * 10f);
  }
 }

Answer 1

Vector3 是一个 struct（不是 class），这意味着它里面的所有字段都用它们的默认值初始化。这就是为什么你不自己用其他值初始化它是(0, 0, 0)的原因（因为float的默认值是x的类型，y z 为 0）。

如何从非初始化值 Lerp 到初始化值？

How is it possible to Lerp from a non initialized value to an initialized value?

unity3d

lerp