BiomeCenterFinder.cs

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

public static class BiomeCenterFinder 
{
    public static List<Vector2Int> neighbours8Directions = new List<Vector2Int>
    {
        new Vector2Int(0,1),
        new Vector2Int(1,1),
        new Vector2Int(1,0),
        new Vector2Int(1,-1),
        new Vector2Int(0,-1),
        new Vector2Int(-1,-1),
        new Vector2Int(-1,0),
        new Vector2Int(-1,1)
    };

    public static List<Vector3Int> CalculateBiomeCenters(Vector3 playerPosition, int drawRange, int mapSize)
    {
        int biomeLength = drawRange * mapSize;

        Vector3Int origin = new Vector3Int(
            Mathf.RoundToInt(playerPosition.x / biomeLength) * biomeLength, 
            0, 
            Mathf.RoundToInt(playerPosition.z / biomeLength) * biomeLength);

        HashSet<Vector3Int> biomCentersTemp = new HashSet<Vector3Int>();

        biomCentersTemp.Add(origin);

        foreach (Vector2Int offsetXZ in neighbours8Directions)
        {
            Vector3Int newBiomPoint_1 = new Vector3Int(origin.x + offsetXZ.x * biomeLength, 0, origin.z + offsetXZ.y * biomeLength);
            Vector3Int newBiomPoint_2 = new Vector3Int(origin.x + offsetXZ.x * biomeLength, 0, origin.z + offsetXZ.y * 2 * biomeLength);
            Vector3Int newBiomPoint_3 = new Vector3Int(origin.x + offsetXZ.x * 2 * biomeLength, 0, origin.z + offsetXZ.y * biomeLength);
            Vector3Int newBiomPoint_4 = new Vector3Int(origin.x + offsetXZ.x * 2 * biomeLength, 0, origin.z + offsetXZ.y * 2 * biomeLength);
            biomCentersTemp.Add(newBiomPoint_1);
            biomCentersTemp.Add(newBiomPoint_2);
            biomCentersTemp.Add(newBiomPoint_3);
            biomCentersTemp.Add(newBiomPoint_4);
        }

        return new List<Vector3Int>(biomCentersTemp);
    }
}