ARmodel

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


public class PlaceOnPlane : MonoBehaviour
{

    private XROrigin sessionOrigin;

    private ARRaycastManager castManager;

    private List<ARRaycastHit> hits;

    public GameObject model;
    public GameObject canvas;

    bool IsPointerOverUIObject(Vector2 pos)
    {
        if (EventSystem.current == null)
            return false;
        PointerEventData eventDataCurrentPosition = new PointerEventData(EventSystem.current);
        eventDataCurrentPosition.position = new Vector2(pos.x, pos.y);
        List<RaycastResult> results = new List<RaycastResult>();
        EventSystem.current.RaycastAll(eventDataCurrentPosition, results);
        return results.Count > 0;
    }

    void Start()

    {

        sessionOrigin = GetComponent<XROrigin>();
        castManager = GetComponent<ARRaycastManager>();
        hits = new List<ARRaycastHit>();

        model.SetActive(false);
        canvas.SetActive(false);
    }



    void Update()

    {

        if (Input.touchCount == 0) return;


        Touch touch = Input.GetTouch(0);

        if (castManager.Raycast(touch.position, hits, UnityEngine.XR.ARSubsystems.TrackableType.PlaneWithinPolygon) && !IsPointerOverUIObject(touch.position))
        {
            Pose pose = hits[0].pose;


            if (!model.activeInHierarchy)
            {
                model.SetActive(true);
                model.transform.position = pose.position;
                model.transform.rotation = pose.rotation;

                canvas.SetActive(true);
            }
            else
            {
                model.transform.position = pose.position;
            }
        }

    }
}