Unity additive scene loading example

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

#if UNITY_EDITOR
using UnityEditor;
#endif

// @kurtdekker
// designed to be in your content scene where you're editing the level.
// this then loads the player, UI, pause button, music, etc.

public class SceneLoader : MonoBehaviour
{
    private void Reset()
    {
        name = "AdditiveSceneLoader";
    }

    const string s_LoadingPrefab = "Prefabs/Loading/Canvas_Loading_Prefab";

    public List<string> additiveScenes;
    void InitGame()
    {
        // global variables
        DSM.State.Score.iValue = 0;
    }

    IEnumerator Start()
    {
        var loading = Instantiate<GameObject>(Resources.Load<GameObject>(s_LoadingPrefab));

        InitGame();
        foreach (var additiveScene in additiveScenes)
        {
            if (string.IsNullOrEmpty(additiveScene))
            {
                continue;
            }
            SceneHelper.GotoScene(additiveScene, true);
        }

        // lets all the scenes load
        yield return null;

        Destroy(loading);
    }


#if UNITY_EDITOR
    [CustomEditor(typeof(SceneLoader)), CanEditMultipleObjects]
    public class SceneLoaderEditor : Editor
    {
        public override void OnInspectorGUI()
        {
            SceneLoader sl = (SceneLoader)target;

            DrawDefaultInspector();

            EditorGUILayout.BeginVertical();

            if (GUILayout.Button("EMIT STRINGS TO DEBUG"))
            {
                var s = "Scenes list:\n\n";
                for (int i = 0; i < sl.additiveScenes.Count; i++)
                {
                    s = s + sl.additiveScenes[i] + "\n";

                }
                Debug.Log(s);
            }

            EditorGUILayout.EndVertical();
        }
    }
#endif
}