unity UI拖拽出3d物体

您好!

在Unity中创建3D物体并在UI上拖拽出它可以通过以下步骤实现：

1. 创建一个3D物体，并将其命名为"3DObject"。

2. 在Hierarchy面板中选择"3DObject"，然后在Inspector面板中将"Tag"设置为"Draggable"。

3. 在Hierarchy面板中创建一个UI > Button游戏对象，并将其命名为"DraggableButton"。

4. 在Project面板中创建一个新的C#脚本，并将其命名为"DraggableObject"。

5. 将"DraggableObject"脚本拖放到"3DObject"游戏对象上。

6. 在"DraggableObject"脚本中，添加以下代码：

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

public class DraggableObject : MonoBehaviour, IBeginDragHandler, IDragHandler, IEndDragHandler {

    public Transform parentToReturnTo = null;
    public Transform placeholderParent = null;

    GameObject placeholder = null;

    public void OnBeginDrag(PointerEventData eventData)
    {
        placeholder = new GameObject();
        placeholder.transform.SetParent( this.transform.parent );
        LayoutElement le = placeholder.AddComponent<LayoutElement>();
        le.preferredWidth = this.GetComponent<LayoutElement>().preferredWidth;
        le.preferredHeight = this.GetComponent<LayoutElement>().preferredHeight;
        le.flexibleWidth = 0;
        le.flexibleHeight = 0;

        placeholder.transform.SetSiblingIndex( this.transform.GetSiblingIndex() );

        parentToReturnTo = this.transform.parent;
        placeholderParent = parentToReturnTo;
        this.transform.SetParent( this.transform.parent.parent );

        GetComponent<CanvasGroup>().blocksRaycasts = false;
    }

    public void OnDrag(PointerEventData eventData)
    {
        this.transform.position = eventData.position;

        if(placeholder.transform.parent != placeholderParent)
            placeholder.transform.SetParent(placeholderParent);

        int newSiblingIndex = placeholderParent.childCount;

        for(int i=0; i < placeholderParent.childCount; i++)
        {
            if(this.transform.position.x < placeholderParent.GetChild(i).position.x)
            {