WaypointCreator.cs

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

public class WaypointCreator : MonoBehaviour
{
    // How many WayPoints do we want in our game?
    public int NumOfWayPoints = 3;

    //
    private GameObject FloorObj;
    private float FloorX = 0;
    private float FloorY = 0;
    private GameObject WayPoint;
    private Vector3 NewWaypoint;

    // Start is called before the first frame update
    void Start()
    {
        FloorObj = GameObject.FindGameObjectWithTag("Floor");
        FloorX = FloorObj.GetComponent<MeshFilter>().mesh.bounds.size.x * FloorObj.transform.localScale.x;
        FloorY = FloorObj.GetComponent<MeshFilter>().mesh.bounds.size.y * FloorObj.transform.localScale.y;

        // create Number of Way points on the floor.
        WayPoint = GameObject.FindGameObjectWithTag("Waypoint");
        WayPoint.SetActive(false);

        for(int i=0; i<NumOfWayPoints; i++)
        {
            //instatiates a copy of WayPoint. 
            float x = Random.Range(-40, FloorX - 60);
            float y = Random.Range(-40, FloorY - 60);
            //Debug.Log(x);
            //NewWaypoint = new Vector3(x, y);
            Vector3 NewWayPWorldPos = Camera.main.ViewportToWorldPoint(NewWaypoint);
            NewWayPWorldPos.x = x;
            NewWayPWorldPos.y = 0;
            NewWayPWorldPos.z = y;
            Instantiate(WayPoint, NewWayPWorldPos, new Quaternion(), transform).SetActive(true);

            //Debug.Log(NewWayPWorldPos.x);
        }
    }

    // Update is called once per frame
    void Update()
    {
        
    }
}