Scene helper for Unity additive loading.

SceneHelper.cs

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

public static class SceneHelper
{
	public static void LoadScene( string s, bool additive = false, bool setActive = false)
	{
		if (s == null)
		{
			s = UnityEngine.SceneManagement.SceneManager.GetActiveScene ().name;
		}
		UnityEngine.SceneManagement.SceneManager.LoadScene (
			s, additive ? UnityEngine.SceneManagement.LoadSceneMode.Additive : 0);

		if (setActive)
		{
            // to mark it active we have to wait a frame for it to load.
            // Get the CallAfterDelay code at https://gist.github.com/kurtdekker/0da9a9721c15bd3af1d2ced0a367e24e
			CallAfterDelay.Create( 0, () => {
				UnityEngine.SceneManagement.SceneManager.SetActiveScene(
					UnityEngine.SceneManagement.SceneManager.GetSceneByName( s));
			});
		}
	}

	public static void UnloadScene( string s)
	{
		UnityEngine.SceneManagement.SceneManager.UnloadSceneAsync(s);
	}
}

Hello, i just found this in your thread in unity forum
This could load the occlusion data from any scene? is not required to make occlusion before of all scene in the main active like documentation explain?
https://docs.unity3d.com/es/2019.4/Manual/occlusion-culling-scene-loading.html

To use SceneHelper to load one scene:

SceneHelper.LoadScene ("JustOneScene");

To additively load multiple scenes:

SceneHelper.LoadScene( "Scene1");
SceneHelper.LoadScene( "Scene2", additive: true);
SceneHelper.LoadScene( "Lighting", additive: true, setActive: true);

I have a problem with additive loading scenes and activating them. I always want the newly loaded scene to be the active one: When I call CallAfterDelay.Create( 0, ...) with 0 I still get an error that the scene is not yet loaded and can not be set active. I increased this number to 0.1 which solved this problem, but then I have the problem that the scene is loaded and the updates are started before the scene is active. Some updates are concerning the active scene which is then in the beginning not the scene which is newly loaded. Do you have any ideas how this can be solved?