Unity：在UI上和物体交互_unity ui内的模型交互

实现思路
通过计算点击点在ui上的比例，来和标准屏幕上的点建立映射关系，达到交互效果

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

public class Machine_RawImageToMouseClick : MonoBehaviour,IPointerDownHandler, IPointerEnterHandler,IPointerExitHandler
{
    [Tooltip("用于发射射线的相机")]
    public Camera targetCamera;
    public bool isStay;

    public void OnPointerDown(PointerEventData eventData)
    {
        if (Input.GetMouseButtonDown(0)&&isStay)
        {
            Vector3 mouseLocalPos = transform.InverseTransformPoint(Input.mousePosition);
            Vector3 rate = new Vector3(mouseLocalPos.x/GetComponent<RectTransform>().sizeDelta.x , mouseLocalPos.y / GetComponent<RectTransform>().sizeDelta.y, 0);
            Ray ray = targetCamera.ScreenPointToRay(new Vector3(rate.x * 1920, rate.y * 1080,0));
            RaycastHit hit;
            if (Physics.Raycast(ray, out hit))
            {

            }
        }
    }

    public void OnPointerEnter(PointerEventData eventData)
    {
        isStay = true;
    }

    public void OnPointerExit(PointerEventData eventData)
    {
        isStay = false;
    }

    // Update is called once per frame
    void Update()
    {
        if (!isStay||Input.GetMouseButton(0)|| Input.GetMouseButton(1)|| Input.GetMouseButton(2))
        {
            return;
        }
        Vector3 mouseLocalPos = transform.InverseTransformPoint(Input.mousePosition);
        Vector3 rate = new Vector3(mouseLocalPos.x / GetComponent<RectTransform>().sizeDelta.x, mouseLocalPos.y / GetComponent<RectTransform>().sizeDelta.y, 0);
        Ray ray = targetCamera.ScreenPointToRay(new Vector3(rate.x *1920, rate.y * 1080, 0));
        RaycastHit hit;
        if (Physics.Raycast(ray, out hit))
        {

        }
        else
        {

        }
    }
} 
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