Object comparison

Unity Engine
,
1

I have multiple objects in the scene and I’m changing materials for highlighting them. So I’m using this little scrip for Raycast triggering and it’s working well so far.
Sound is playing well on selection too, but I need to trigger the sound only once. Normally I would make a bool comparison, but in this case, it wouldn’t work I guess. because the script is acting on many different objects.

So my attempt is to include a comparison to check if the user is facing another object. But I have no idea how to do that in C#.

Thanks!

using System.Collections;
using System.Collections.Generic;
using System.Configuration;
using UnityEditorInternal;
using UnityEngine;

public class SelectionManager : MonoBehaviour
{
    [SerializeField] private string selectableTag = "Selectable";
    [SerializeField] private Material highlightMaterial;
    [SerializeField] private Material defaultMaterial;

    private Transform _selection;
    private Transform last_selection;

    public AudioSource playsound;
    
    private void Update()
    {
        if (_selection != null)
        {
            var selectionRenderer = _selection.GetComponent<Renderer>();
            selectionRenderer.material = defaultMaterial;
            _selection = null;
        }

        var ray = Camera.main.ScreenPointToRay(Input.mousePosition);

        RaycastHit hit = new RaycastHit();

        if (Physics.Raycast(ray, out hit))
        {
            var selection = hit.transform;
            if (selection.CompareTag(selectableTag))
            {
                var SelectionRenderer = selection.GetComponent<Renderer>();
               
                if (SelectionRenderer != null)
                {
                    SelectionRenderer.material = highlightMaterial;
                    /*
                    if(GameObject.ReferenceEquals( _selection, last_selection)){
                        Debug.Log( "equal");
                    }else{
                        Debug.Log( "not equal, playing sound");
                        playsound.Play();
                        last_selection = _selection;       
                    }   
                    */
                }
            }

            _selection = selection;

        }
    }
}
2

You pass to this script the asset of the material (highlightMaterial) so you have to compare the non-instanced material like this:

if (SelectionRenderer.sharedMaterial == highlightMaterial) {
  // material is the same
  Debug.Log( "equal");
} else {
  // material is not the same
  Debug.Log( "not equal, playing sound");
  playsound.Play();
  last_selection = _selection; 
}
3

Thanks, but as far as I can see the problem remains. How will I know that the sounds were played once on the selected object to avoid continuous replays?

4

Simply attach a script to your selectable scene objects and add this bool:

using UnityEngine;

public class Selectable : MonoBehaviour
{
   [HideInInspector]
   public bool soundPlayed = false;
}

And in your manager class:

//var SelectionRenderer = selection.GetComponent<Renderer>();
Selectable selectable = selection.GetComponent<Selectable>();

if (selectable != null)
{
  if(selectable.soundPlayed){
      Debug.Log( "Sound already played.");
  }else{
      Debug.Log( "Playing sound.");
      playsound.Play();
      selectable.soundPlayed = true;
      last_selection = _selection;   
  }
}
5

Indeed, that works perfectly. Thanks a lot!