AvatarSpawner.cs

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using UnityEngine;
using UnityEngine.AI;
using Microsoft.MixedReality.Toolkit.UI;
 
public class AvatarSpawner : MonoBehaviour 
{
    
    [SerializeField] private ScrollingObjectCollection m_Scrollview;
 
    [SerializeField] private GameObject[] m_AvatarPrefabs;
 
    private int m_AvatarIndex = -1;
 
    private const int m_NumberOfAvatars = 7;
 
    private GameObject m_LastAvatar;
 
    private void Update()
    {
        SetVisibleCellIndex();
    }
 
    private void SetVisibleCellIndex()
    {
        m_AvatarIndex = m_Scrollview.FirstVisibleCellIndex;       
 
        // Prevent accessing out of bound cell number
        if (m_AvatarIndex >= m_NumberOfAvatars)
        {            
            m_AvatarIndex -= 1;
        }
    }
 
    public void SpawnAvatar() 
    {
 
        int index = m_AvatarIndex;
 
        if (index < 0 || index >= m_AvatarPrefabs.Length) 
        {
            Debug.LogError($"Can't instantiate prefab, unable to find specified index '{index}'.");
            return;
        }
 
        var prefab = m_AvatarPrefabs[index];
 
        if (!prefab) 
        {
            Debug.LogError("Can't load avatar prefab.");
            return;
        }
 
        if (m_LastAvatar)
        {
            Destroy(m_LastAvatar);
        }           
 
        var position = Camera.main.transform.position + Camera.main.transform.forward * 3 + new Vector3(0, -0.6f, 0);
        m_LastAvatar = Instantiate(prefab, position, Quaternion.identity);       
    }
}