Процедурная генерация сетки

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
 
[RequireComponent(typeof(MeshFilter), typeof(MeshRenderer))]
public class Truby : MonoBehaviour
{
    [SerializeField]
    private int _xSize = 100, _zSize = 100;
    [SerializeField]
    private int r = 5;
 
    public Material Material;
    private Vector3[] _vertices;
    private Mesh _mesh;
 
    private void Start()
    {
        Generate();
    }
 
    private void Generate()
    {
        _mesh = new Mesh();
        GetComponent<MeshFilter>().mesh = _mesh;
        gameObject.GetComponent<MeshRenderer>().material = Material;
        _mesh.name = "Grid";
 
        _vertices = new Vector3[(2*_xSize + 1) * (2*_zSize + 1)];
        Vector2[] uvs = new Vector2[_vertices.Length];
        Vector4[] tangents = new Vector4[_vertices.Length];
        Vector4 tangent = new Vector4(1f, 0f, 0f, -1f);
 
        for (int z = 0, i = 0; z <= _zSize; z++)
        {
            for (int x = -_xSize; x <= _xSize; x++) 
            {
            float y = Mathf.Sqrt(r * r - (x * x - _xSize));
            
            _vertices[i] = new Vector3(x, y, z);
                i++;
            }
         }
 
        int[] triangles = new int[2 * _xSize * _zSize * 6];
        int ti = 0, vi = 0;
        for (int z = 0; z < _zSize; z++, vi++)
        {
            for (int x = 0; x < _xSize; x++, ti += 6, vi++)
            {
                triangles[ti] = vi;
                triangles[ti + 1] = triangles[ti + 4] = vi + _xSize + 1;
                triangles[ti + 2] = triangles[ti + 3] = vi + 1;
                triangles[ti + 5] = vi + _xSize + 2;
            }
        }
 
        _mesh.vertices = _vertices;
        _mesh.triangles = triangles;
        _mesh.RecalculateNormals();
        //_mesh.uv = uvs;        
        //_mesh.tangents = tangents;
    }        
 
}