Grid Gen for Shelby

GridGenerator.cs

using UnityEngine;
using System.Collections;
using System.Collections.Generic;
public class GridGenerator : MonoBehaviour
{
    [SerializeField]
    private GameObject _gridPrefab;
    public int rows;
    public int cols;

    List<GameObject> _gridList = new List<GameObject>();
    [ContextMenu("Generate Grids")]
    public void GenerateGrids()
    {
        
        float width = _gridPrefab.GetComponent<BoxCollider>().size.x;
        float height = _gridPrefab.GetComponent<BoxCollider>().size.y;

        float xPos = 0;
        float yPos = 0; 
        float zPos = 0;

        //z value
        for (int i = 0; i < rows; i++)
        {
            zPos = i  * width;
            //x value
            for (int j = 0; j < cols; j++)
            {
                
                xPos = j * width;
                yPos = 0;
                
                Vector3 newPos = new Vector3(xPos, yPos, zPos);
                GameObject go =  Instantiate(_gridPrefab, newPos, Quaternion.identity) as GameObject;
                go.name = "Grid " + "[" + j + "]" + "[" + i + "]";
                go.transform.parent = transform;                
                _gridList.Add(go);
            }            
        }
    }

    [ContextMenu("Destroy Grid")]
    public void DestroyGrid()
    {
        if (_gridList.Count == 0)
        {
            foreach (Transform t in transform)
            {
                _gridList.Add(t.gameObject);
            }
            foreach (GameObject go in _gridList)
            {
                DestroyImmediate(go);
            }
        }
        else
        {
            foreach (GameObject go in _gridList)
            {
                DestroyImmediate(go);
            }
        }

        _gridList = new List<GameObject>();

        
    }
}