How to detect something a GameObject is sitting on

Questions & Answers
1

Hi, so I am making a game where you spawn a tower on a block. I need to access the block that the tower is sitting on, and I am wondering how I would do that. For example, I spawn a tower (making a tower defense game) by clicking on a block. I then want my code that is a component on the tower I just spawned to access the block it spawned on. How would I do that? Thanks!
Here is the code attached to my blocks (or waypoints):

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

public class EnemyMovement : MonoBehaviour
{
[SerializeField] PathFinder pathfinder;
[SerializeField] EnemySpawner enemySpawner;
[SerializeField] GameObject enemyObject;

public bool isMoving;
bool stopMoving;

// Use this for initialization
void Start()
{
    isMoving = true;
    PathFinder pathfinder = FindObjectOfType<PathFinder>();
    var path = pathfinder.GetPath();
    StartCoroutine(FollowPath(path));
}

IEnumerator FollowPath(List<Waypoint> path)
{
    foreach (Waypoint waypoint in path)
    {
        if (isMoving == true)
        {
            transform.position = new Vector3(waypoint.transform.position.x, enemySpawner.enemySpawnHeight, waypoint.transform.position.z);
            yield return new WaitForSeconds(1f);
        }
        else
        {
            // Do Nothing
        }
    }
}

}

2

I copy and pasted the wrong script lol. Here you you:
using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Waypoint : MonoBehaviour
{
[SerializeField] Tower towerPrefab;
[SerializeField] Tower tower;
[SerializeField] Transform towers;
[SerializeField] PathFinder pathFinder;
[SerializeField] TextController textController;
public bool hasTower;
public bool towerIsLevel1;
public bool towerIsLevel2;
public bool towerIsLevel3;
[SerializeField] EnemyTrigger enemyTrigger;
[SerializeField] TowerLevel2 towerLevel2Prefab;
[SerializeField] TowerLevel3 towerLevel3Prefab;
public Tower spawnedTower;
Tower towerSpawned;

// public ok here as it is a data class 
public bool isExplored = false; // ok as is a data class
public Waypoint exploredFrom;
public bool isPlaceable = true;
public bool isPath;

Vector2Int gridPos;

const int gridSize = 20;
public int GetGridSize()
{
    return gridSize;
}

public Vector2Int GetGridPos()
{
    return new Vector2Int(
          Mathf.RoundToInt(transform.position.z / gridSize),
          Mathf.RoundToInt(transform.position.x / gridSize)
    );
}

void Start()
{
    
}

void OnMouseOver()
{
    if (Input.GetMouseButtonDown(0))
    {
        CheckForUpgrade();
        if (pathFinder.numberOfTowers != pathFinder.towerLimit && isPlaceable == true)
        {
            SpawnTower();
            var updatedTowerText = textController.towersLeft = textController.towersLeft - 1;
            textController.towerText.text = updatedTowerText.ToString();
        }
        else if (pathFinder.numberOfTowers == pathFinder.towerLimit && hasTower == false)
        {
            print("Tower Limit Reached!");
        }
    }
}

public void SpawnTower()
{
    float towerX = transform.position.x;
    float towerZ = transform.position.z;
    Vector3 towerPos = new Vector3(towerX, 20f, towerZ);
    spawnedTower = Instantiate(towerPrefab, towerPos, Quaternion.identity);
    hasTower = true;
    spawnedTower.transform.parent = towers;
    isPlaceable = false;
    pathFinder.numberOfTowers = pathFinder.numberOfTowers + 1;
    towerIsLevel1 = true;
    towerIsLevel2 = false;
    towerIsLevel3 = false;
}
void CheckForUpgrade()
{
    if (isPlaceable == false && textController.points >= tower.scoreNeededForLvl2 && isPath == false && textController.points < tower.scoreNeededForLvl3
        && towerIsLevel3 == false && towerIsLevel1 == true && towerIsLevel2 == false)
    {
        print("Upgraded To Level 2");
        textController.points -= tower.scoreNeededForLvl2;
        towerIsLevel1 = false;
        towerIsLevel2 = true;
        towerIsLevel3 = false;
        spawnedTower.damagePerHit = towerLevel2Prefab.damagePerHit;
    }
    else if (isPlaceable == false && textController.points >= tower.scoreNeededForLvl3 && isPath == false && textController.points > tower.scoreNeededForLvl2
        && towerIsLevel2 == true && towerIsLevel3 == false && towerIsLevel1 == false)
    {
        print("Upgraded To Level 3");
        textController.points -= tower.scoreNeededForLvl3;
        towerIsLevel2 = false;
        towerIsLevel3 = true;
        spawnedTower.damagePerHit = towerLevel3Prefab.damagePerHit;
    }
}

}