No Raycasthit in the cube target detected

Hey peoples,

I'm an absolute beginner with Unity and Vuforia. For my Bachelor thesis, I'm working on an AR Application augmenting a physical 2D Map. For filtering the content I tried to use some 3D buttons on the side which execute different filter options.

On youtube, I found several videos to setup raycast to track model hits through touch interaction. For testing, i copied the code from the video.

I attached the script as he does in his video (https://www.youtube.com/watch?v=hi_KDpC1nzk) to my image target.

My 3D Button (Cube) is a child of it with a mesh collider on it.

Whatever I do my camera / android device does not detect any hits at all. For reasons I never get into the needed part of the function cause (Physics.Raycast(ray, out hit) never returns true...

I am absolutely clueless to what else I could do to make this work. I`ve already tried each advice I found on several forums and or videos.

This is the code I use:

using UnityEngine; using UnityEngine.Events; using UnityEngine.EventSystems;

public class buttonController : MonoBehaviour {

    public AudioClip[] audioClips;     public AudioSource myAudioSource;     string btnName;

    private void Start()     {         myAudioSource = GetComponent<AudioSource>();     }

    private void Update()     {         if (Input.touchCount > 0 && Input.touches [0].phase == TouchPhase.Began)         {             Ray ray = Camera.main.ScreenPointToRay(Input.GetTouch(0).position);             RaycastHit hit;

            if (Physics.Raycast(ray, out hit))             {                 btnName = hit.transform.name;

                switch (btnName)                 {                     case "buttonPOI":                         myAudioSource.clip = audioClips[0];                         myAudioSource.Play();                         break;                 }             } else             {                 Debug.Log("NOTHING HAPPENED");             }         }     } }

I would appreciate it so much if anyone has a clue or hint.

Regards

Stephan