如何将视差添加到在播放模式下实例化并在 Unity 3d 中使用摄像机位置重新创建的对象

Question

所以我无尽的2D游戏在背景中有2层山脉，我想在上面添加视差，Near层需要比演员/摄像机慢，而Far层最慢。问题是，我不能直接为它们添加运动脚本，因为它们是根据随机主题颜色在播放模式下随机实例化的，所以它们是从下面的脚本中一个接一个地创建的，但我想在它们上添加一个比相机速度慢的 x 轴上的运动，同时也让它在最后一个结束时连续重新创建。

这是创建新山脉的脚本：

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class PathManager : MonoBehaviour {
public static PathManager Instance;
public GameObject CoinFragments;
public GameObject SlideArrow;
public float parallaxSpeed = 5f; //
private GameObject lastPathObject;
private float PathXPosition;
private GameObject lastMountainFar;
private float MountainFarXPosition;
private GameObject lastMountainNear;
private float MountainNearXPosition;
private float StarXPostion;
private float lastCameraX;  //
// Use this for initialization
void Start () {
Instance = this;
}
// Update is called once per frame
void Update()
{
}

private void LateUpdate()
{
// Check for new Near Mountain
if (lastMountainNear != null && GamePlayCameraManager.Instance.MainCamera.transform.position.x > lastMountainNear.transform.position.x)
{
this.GenerateNearMountain();
}
// Check for new Far Mountain
if (lastMountainFar != null && GamePlayCameraManager.Instance.MainCamera.transform.position.x > lastMountainFar.transform.position.x)
{
this.GenerateFarMountain();
}
}

// Start Creating Mountains
public void StartMountainCreation(){
MountainNearXPosition = GamePlayCameraManager.Instance.MainCamera.transform.position.x;
MountainFarXPosition = GamePlayCameraManager.Instance.MainCamera.transform.position.x;
this.GenerateNearMountain();
this.GenerateFarMountain();
}
private void GenerateNearMountain(){
Vector3 MountainPosition = new Vector3(MountainNearXPosition - 4f, -3.6f, 10f);
lastMountainNear = Instantiate(ThemeManager.Instance.SelectedMountainNear, MountainPosition, Quaternion.identity);
MountainNearXPosition = MountainNearXPosition + lastMountainNear.GetComponent<Renderer>().bounds.size.x - 0.01f;
//float deltaX = GamePlayCameraManager.Instance.MainCamera.transform.position.x - lastCameraX;
//lastCameraX = GamePlayCameraManager.Instance.MainCamera.transform.position.x;
//lastMountainNear.transform.position += Vector3.right * (deltaX * parallaxSpeed);
}
private void GenerateFarMountain(){
Vector3 MountainPosition = new Vector3(MountainFarXPosition - 4f, -3.6f, 22f);
lastMountainFar = Instantiate(ThemeManager.Instance.SelectedMountainFar, MountainPosition, Quaternion.identity);
MountainFarXPosition = MountainFarXPosition + lastMountainFar.GetComponent<Renderer>().bounds.size.x - 0.01f;
}

这是我的相机移动脚本：

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class GamePlayCameraManager : MonoBehaviour {
public static GamePlayCameraManager Instance;   // Singleton Instance
public Camera MainCamera;   // Main Camera
private Vector3 offset;
// Use this for initialization
void Start () {
Instance = this;
MainCamera.transform.position = new Vector3(0, 0, -10);
}
// Update is called once per frame
void Update () {
}
void LateUpdate()
{
if (GameStateManager.GameState == GameState.Set || GameStateManager.GameState == GameState.Playing)
MainCamera.transform.position = new Vector3(this.offset.x + ActorManager.Instance.Actor.transform.position.x + 0.8f, 0, -10);
}
// Fixed Update Method
void FixedUpdate(){
}
public void FindCameraOffset(){
this.offset = ActorManager.Instance.Actor.transform.position - MainCamera.transform.position + new Vector3(1.5f, 0f, 0f);
}
}

Answer 1

首先，您应该考虑池化您的山地对象，这样您就不会浪费 CPU 和内存无休止地创建它们。

一旦你把它们汇集到你的PathManager中，你需要首先知道相机在最后一帧中移动了多远，然后告诉山脉根据这一点移动。 您必须在相机管理器中引用您的PathManager。

在相机管理器的LateUpdate中：

if (GameStateManager.GameState == GameState.Set || GameStateManager.GameState == GameState.Playing) {     
Vector3 newPosition = new Vector3(this.offset.x + ActorManager.Instance.Actor.transform.position.x + 0.8f, 0, -10);
float cameraMoveAmount = newPosition.x - MainCamera.transform.position.x;
MainCamera.transform.position = newPosition;
pathManager.MoveMountains(cameraMoveAmount) 
}

然后，在您的路径管理器中，使用该 moveAmount 更改所有山脉的位置，以及将创建下一座山脉的位置。 在此之后，您应该检查是否需要显示新山，而不是在路径管理器的LateUpdate中。这是因为您需要在检查添加新山脉之前移动山脉，并且无法保证如果将它们放在不同的LateUpdate调用中，则首先发生。

像这样：

// How fast the mountain layers are going to move in the direction of the camera.    
// 0.0f - will not move with the camera, mountains will slide out of frame at normal speed.
// 1.0f - will move with the camera, no movement will be visible in frame.
public float nearMountainMoveSpeed = 0.5;
public float farMountainMoveSpeed = 0.9f;
. . .
public void MoveMountains(float cameraMoveAmount) {
float nearMountainParallaxMove = nearMountainMoveSpeed * cameraMoveAmount;
float farMountainParallaxMove = farMountainMoveSpeed * cameraMoveAmount;
// Move the near mountains & their next placement
MountainNearXPosition += nearMountainParallaxMove;
foreach (GameObject nearMountain in pooledNearMountains) {
nearMountain.transform.position = nearMountain.transform.position + new Vector3(nearMountainParallaxMove,0f,0f);
}    
// Check for new Near Mountain
if (lastMountainNear != null && GamePlayCameraManager.Instance.MainCamera.transform.position.x > lastMountainNear.transform.position.x) {
this.GenerateNearMountain();
}
// Move the far mountains & their next placement
MountainFarXPosition += farMountainParallaxMove;
foreach (GameObject farMountain in pooledFarMountains) {
farMountain.transform.position = farMountain.transform.position + new Vector3(farMountainParallaxMove,0f,0f);
}
// Check for new Far Mountain
if (lastMountainFar != null && GamePlayCameraManager.Instance.MainCamera.transform.position.x > lastMountainFar.transform.position.x) {
this.GenerateFarMountain();
}
}

顺便说一句，如果你最终改变了你的代码，并且有一个游戏对象，所有的远山都是子级，一个是所有近山作为子级的游戏对象，那么你只需移动这些父游戏对象的变换，而不是循环遍历每座山。当然，您需要移动它的数量是相同的。