Unity In-editor area/location mapping tool that allows you to identify different parts of a large level

SceneGUIBezierInspector.cs

//NOTE: Place this script inside the Editor folder in your Scripts folder. If you don't have one, you can create a folder name Editor

using UnityEngine;
using UnityEditor;

[CustomEditor(typeof(SceneMapper))]
public class SceneGUIBezierInspector : Editor
{
    void OnSceneGUI()
    {
        var script = (SceneMapper)target;
        if (script != null && script.points != null)
        {
            for (int i = 0; i < script.points.Length; i++)
            {
                if (script.editorMode)
                {
                    script.points[i].point = Handles.PositionHandle(script.points[i].point, Quaternion.identity);
                }

                GUIStyle guiStyle = new GUIStyle();
                guiStyle.fontSize = script.points[i].labelSize;
                guiStyle.fontStyle = FontStyle.Bold;
                guiStyle.normal.textColor = script.points[i].labelColor;

                Handles.Label(script.points[i].point + script.labelOffset, script.points[i].label, guiStyle);
                Handles.Label(script.points[i].point, script.pinTexture);
            }
        }
    }
}

SceneMapper.cs

//Place this in in your scripts folder

using UnityEngine;

public class SceneMapper : MonoBehaviour
{
    public enum PinSize { Small, Medium, Large }

    public bool editorMode;
    public PinSize pinSize = PinSize.Small;
    public SceneMapPoint[] points;
    public Vector3 labelOffset;

    public Texture pinTexture;

} 

SceneMapPoint.cs

//Place this in in your scripts folder

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

[Serializable]
public class SceneMapPoint
{
    public string label;
    public Vector3 point;
    public int labelSize = 10;
    public Color labelColor = Color.white;
}