Unity AR射线检测脚本报错CS1503：无法将Touch转换为Vector2

错误信息 #

问题原因 #

ARRaycastManager.Raycast()方法要求第一个参数为屏幕坐标类型的Vector2，但代码中直接传入了Input.GetTouch(0)返回的Touch对象，导致类型不匹配触发报错。

修复后代码 #

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

public class Raycast_Script : MonoBehaviour
{
    public GameObject spawn_prefab;
    GameObject spawned_object;
    bool object_spawned;
    ARRaycastManager arrayman;
    List<ARRaycastHit> hits = new List<ARRaycastHit>();

    void Start()
    {
        object_spawned = false;
        arrayman = GetComponent<ARRaycastManager>();
    }

    void Update()
    {
        if (Input.touchCount > 0)
        {
            Touch touch = Input.GetTouch(0);
            // 传入触摸点的屏幕坐标（Vector2类型）
            if (arrayman.Raycast(touch.position, hits, TrackableType.PlaneWithinPolygon))
            {
                var hitpose = hits[0].pose;
                if (!object_spawned)
                {
                    spawned_object = Instantiate(spawn_prefab, hitpose.position, hitpose.rotation);
                    object_spawned = true;
                }
                else
                {
                    spawned_object.transform.position = hitpose.position;
                }
            }
        }
    }
}

修复说明 #

• 核心修改：将arrayman.Raycast(Input.GetTouch(0), ...)改为arrayman.Raycast(Input.GetTouch(0).position, ...)，确保传入的是符合要求的Vector2类型屏幕坐标。
• 也可以先获取Touch对象再提取position属性，写法更清晰，两种方式都能解决类型转换错误。

内容的提问来源于stack exchange，提问作者Tengis