Unity 2D：点击生成带上升动画的Prefab文本Y轴位置异常

我的奖励文本粒子动画设置为X轴始终保持0，Y轴从0上升至1。但游戏运行时，点击屏幕生成粒子时，X轴能和手指点击位置对齐，Y轴却始终从0开始，不是点击的Y轴位置。我希望粒子能在点击的精确位置生成，怀疑是动画的问题，但不知道怎么修。

附带代码 #

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.EventSystems;
using BreakInfinity;
using UnityEngine.Pool;

public class GameManager : MonoBehaviour
{
    [Header("Stats")]
    public static BigDouble notes = 0;
    public static BigDouble tap = 10;
    public static BigDouble auto = 0;

    [Header("Taps")]
    [SerializeField] private GameObject bonusParticlePrefab;

    float tapCooldown = 0.04f;
    float lastTapTime = 0f;

    private ObjectPool<GameObject> bonusParticlesPool;

    void Start()
    {
        bonusParticlesPool = new ObjectPool<GameObject>(CreateFunction, ActionOnGet, ActionOnRelease, ActionOnDestroy);
    }

    private GameObject CreateFunction()
    {
        return Instantiate(bonusParticlePrefab, transform);
    }

    private void ActionOnGet(GameObject bonusParticle)
    {
        bonusParticle.SetActive(true);
    }

    private void ActionOnRelease(GameObject bonusParticle)
    {
        bonusParticle.SetActive(false);
    }
    
    private void ActionOnDestroy(GameObject bonusParticle)
    {
        Destroy(bonusParticle);
    }

    void Update()
    {
        foreach(Touch touch in Input.touches)
        {
            if (touch.phase == TouchPhase.Began)
            {
                if (Time.time - lastTapTime > tapCooldown)
                    {
                        bool isOverUI = false;
                        for (int i = 0; i < Input.touchCount; i++)
                        {
                            if (EventSystem.current.IsPointerOverGameObject(Input.GetTouch(i).fingerId))
                            {
                                isOverUI = true;
                                break;
                            }
                        }

                        if (!isOverUI) // if not over UI elements
                        {
                            IncreasePoints();
                            Vector3 touchPosition = Camera.main.ScreenToWorldPoint(touch.position);
                            touchPosition.z = 0;

                            lastTapTime = Time.time; // Update the last tap time 

                            GameObject bonusParticleInstance = bonusParticlesPool.Get();
                            bonusParticleInstance.transform.position = touchPosition;

                            LeanTween.delayedCall(1, ()=> bonusParticlesPool.Release(bonusParticleInstance));
                        }
                        
                    }
            }
        }
    }

    void IncreasePoints()
    {
        notes += tap;        
    }
}

核心原因 #

问题出在粒子动画的初始位置硬编码：你的动画将Y轴起始值固定为0，覆盖了代码中设置的点击位置Y值。

修复方案 #

1. 修改动画剪辑（最直接）

• 打开粒子的动画剪辑，找到Y轴动画轨道
• 将Y轴的起始关键帧改为基于当前位置的相对偏移：
  • 把动画类型设置为Additive，或者将起始关键帧的Y值设为0、结束关键帧设为1，让动画从物体当前Y位置向上移动1单位
  • 或者直接删除Y轴的初始固定关键帧，保留从当前位置到+1的动画曲线

2. 代码中修正动画偏移

如果不想改动动画，可以在设置粒子位置后，强制修正动画的起始基准：

GameObject bonusParticleInstance = bonusParticlesPool.Get();
Vector3 touchPosition = Camera.main.ScreenToWorldPoint(touch.position);
touchPosition.z = 0;
bonusParticleInstance.transform.position = touchPosition;

// 修正动画的Y轴起始基准
Animator anim = bonusParticleInstance.GetComponent<Animator>();
if(anim != null)
{
    // 假设动画Y轴是从0到1的绝对移动，这里把动画根节点的Y偏移设为点击位置
    anim.transform.localPosition = new Vector3(0, touchPosition.y, 0);
}

LeanTween.delayedCall(1, ()=> bonusParticlesPool.Release(bonusParticleInstance));

3. 用LeanTween替代内置动画

既然已经在使用LeanTween，完全可以用它直接控制粒子移动，彻底避免动画冲突：

GameObject bonusParticleInstance = bonusParticlesPool.Get();
Vector3 touchPosition = Camera.main.ScreenToWorldPoint(touch.position);
touchPosition.z = 0;
bonusParticleInstance.transform.position = touchPosition;

// 直接用LeanTween实现从点击位置上升1单位的动画
LeanTween.moveY(bonusParticleInstance, touchPosition.y + 1, 1f).setOnComplete(() => 
{
    bonusParticlesPool.Release(bonusParticleInstance);
});

内容的提问来源于stack exchange，提问作者Div