Unity threading example

threading.cs

using System;
using System.Collections.Generic;
using System.Threading;
using UnityEngine;

public class TerrainChunk : MonoBehaviour
{
    private MeshFilter _meshFilter;
    private MeshCollider _meshColllider;
    
    private bool _building;
    private Mesh _mesh;
    private bool _newMesh;

    [SerializeField, Range(1, 50)] private int _iterations = 50;

    private Vector3[] _vertices;
    private Vector3[] _normals;
    private Color[] _colors;
    private Vector2[] _uv;
    private int[] _triangles;
    private Thread _thread;
    private bool _requestNewMesh;

    // Use this for initialization
    void Start()
    {
        _meshFilter = gameObject.GetComponent<MeshFilter>();
        _meshColllider = gameObject.GetComponent<MeshCollider>();
    }
    private void Update()
    {
        CheckMesh();
    }

    public void UpdateMesh()
    {
      _requestNewMesh = true;
    }

    private void CheckMesh()
    {
        if (_newMesh)
        {
            _queue.Dequeue();
            _mesh = new Mesh();
            _mesh.vertices = _vertices;
            _mesh.colors = _colors;
            _mesh.uv = _uv;
            _mesh.triangles = _triangles;
            _mesh.normals = _normals;

            _meshFilter.sharedMesh = _mesh;
            _meshColllider.sharedMesh = _mesh;

            if (OnBuild != null)
            {
                OnBuild.Invoke();
            }
            _newMesh = false;
        }

        if (_requestNewMesh)
        {
            if (!_building)
            {
                _newMesh = false;
                _building = true;
                _requestNewMesh = false;
                _thread = new Thread(BuildChunk);
                _thread.Start();
            }
        }
    }

    public void BuildChunk()
    {
        if (_iterations > 0)
        {
            int rows = _iterations * 2 + 1;
            int numVerts = (int) Mathf.Pow(rows, 2);
            int numTris = numVerts * 2;
            _vertices = new Vector3[numVerts];
            _normals = new Vector3[numVerts];
            _colors = new Color[numVerts];
            _uv = new Vector2[numVerts];

            // HEAVY LIFTING
        }

        _newMesh = true;
        _building = false;
    }
}