ici_recycle_vr/Assets/Scripts/Trash.cs

using LiquidVolumeFX;
using System;
using System.Linq;
using UnityEngine;
using UnityEngine.XR.Interaction.Toolkit;
using UnityEngine.XR.Interaction.Toolkit.Interactables;

public enum TrashBinType
{
    SGR,
    Sticla,
    HartieCarton,
    PlasticMetal,
    Rezidual,
    Biodegradabil
}

public class Trash : MonoBehaviour
{
    [Header("Trash Settings")]
    public bool hasBeenCollected = false;
    public TrashBinType trashType;

    [Header("Liquid Volume Settings(DO NOT ASSIGN IN INSPECTOR!)")]
    public LiquidVolume liquidVolume;

    private Vector3 portalPosition = new Vector3(-0.75626421f, 1.5f, 4.1960001f);
    private Rigidbody rb;
    private XRGrabInteractable grabInteractable;
    private void Start()
    {

        if(GetComponent<Rigidbody>() != null)
        {
            rb = GetComponent<Rigidbody>();
        }
        else
        {
            Debug.LogError("Rigidbody component is missing on the Trash object. Please add a Rigidbody component to the Trash object.");
        }

        if(GetComponent<XRGrabInteractable>() != null)
        {
            grabInteractable = GetComponent<XRGrabInteractable>();
        }
        else
        {
            Debug.LogError("XRGrabInteractable component is missing on the Trash object. Please add a XRGrabInteractable component to the Trash object.");
        }

        grabInteractable.selectEntered.AddListener(OnSelectEnter);
        grabInteractable.selectExited.AddListener(OnSelectExit);

        //Exclude the layer named "StopperLayer"
        GameObject root = transform.root.gameObject;
        //Get the collider of the root object and of its children
        Collider[] colliders = root.GetComponentsInChildren<Collider>();
        colliders.Append(root.GetComponent<Collider>());
        foreach (Collider collider in colliders)
        {
           collider.excludeLayers = LayerMask.GetMask("StopperLayer");
        }
        //Get the rigidbody of the root object and of its children
        Rigidbody[] rigidbodies = root.GetComponentsInChildren<Rigidbody>();
        rigidbodies.Append(root.GetComponent<Rigidbody>());
        foreach (Rigidbody rb in rigidbodies)
        {
            rb.excludeLayers = LayerMask.GetMask("StopperLayer");
        }

        if(GetComponentInChildren<LiquidVolume>() != null)
        {
            liquidVolume = GetComponentInChildren<LiquidVolume>();

        }
        
        if(GetComponent<LiquidVolume>() != null)
        {
            liquidVolume = GetComponentInChildren<LiquidVolume>();
        }
    }

    private void Update()
    {
        // If the trash is too far away, move at Vector3(-0.75626421,1.5,4.1960001)
        if(Vector3.Distance(transform.position, portalPosition) > 17f)
        {

            rb.velocity = Vector3.zero;
            transform.position = portalPosition;
        }
    }

    private void OnSelectEnter(SelectEnterEventArgs args)
    {
        Debug.Log("Holding trash!");

        // For all rigidbodies on this transform and children, ignore collisions with "Ignore Raycast" layer
        Collider[] colliders = GetComponentsInChildren<Collider>();
        foreach (Collider collider in colliders)
        {
            collider.excludeLayers = LayerMask.GetMask("Ignore Raycast");
            collider.excludeLayers += LayerMask.GetMask("StopperLayer"); // Add StopperLayer to the exclude layers

        }

        // For all rigidbodies on this transform and children, ignore collisions with "StopperLayer" layer
        Rigidbody[] rigidbodies = GetComponentsInChildren<Rigidbody>();
        foreach (Rigidbody rb in rigidbodies)
        {
            rb.excludeLayers = LayerMask.GetMask("Ignore Raycast");
            rb.excludeLayers += LayerMask.GetMask("StopperLayer"); // Add StopperLayer to the exclude layers
        }

        Collider[] parentColliders = GetComponents<Collider>();
        foreach (Collider collider in parentColliders)
        {
            collider.excludeLayers = LayerMask.GetMask("Ignore Raycast");
            collider.excludeLayers += LayerMask.GetMask("StopperLayer"); // Add StopperLayer to the exclude layers
        }

        Rigidbody[] parentRigidbodies = GetComponents<Rigidbody>();
        foreach (Rigidbody rb in parentRigidbodies)
        {
            rb.excludeLayers = LayerMask.GetMask("Ignore Raycast");
            rb.excludeLayers += LayerMask.GetMask("StopperLayer"); // Add StopperLayer to the exclude layers
        }
    }

    private void OnSelectExit(SelectExitEventArgs args)
    {
        Debug.Log("Not holding trash anymore!");
        // Enable collision
        Collider[] colliders = GetComponentsInChildren<Collider>();
        foreach (Collider collider in colliders)
        {
            collider.excludeLayers = LayerMask.GetMask("StopperLayer"); // Reset to default layer mask
        }

        Rigidbody[] rigidbodies = GetComponentsInChildren<Rigidbody>();
        foreach (Rigidbody rb in rigidbodies)
        {
            rb.excludeLayers = LayerMask.GetMask("StopperLayer"); // Reset to default layer mask
        }

        Collider[] parentColliders = GetComponents<Collider>();
        foreach (Collider collider in parentColliders)
        {
            collider.excludeLayers = LayerMask.GetMask("StopperLayer"); // Reset to default layer mask
        }

        Rigidbody[] parentRigidbodies = GetComponents<Rigidbody>();
        foreach (Rigidbody rb in parentRigidbodies)
        {
            rb.excludeLayers = LayerMask.GetMask("StopperLayer"); // Reset to default layer mask
        }
    }

}