RuntimeInitializeLoadType.BeforeSceneLoad

Description

Callback invoked when the first scene's objects are loaded into memory but before Awake has been called.

For more information on the execution order of this option relative to the others, refer to RuntimeInitializeOnLoadMethodAttribute.

// Demonstration of the RuntimeInitializeLoadType.BeforeSceneLoad attribute to find inactive objects before Awake has been 
// called for the first scene being loaded. Then from these inactive objects we find which ones will be active after Awake is called later.
using UnityEngine;

class MyClass
{
    [RuntimeInitializeOnLoadMethod(RuntimeInitializeLoadType.BeforeSceneLoad)]
    private static void FirstSceneLoading()
    {
        var components = UnityEngine.Object.FindObjectsByType(typeof(MonoBehaviour), FindObjectsInactive.Include, FindObjectsSortMode.None);
        var willBeActiveAfterSceneLoad = 0;
        foreach (var c in components)
        {
            if (WillBeActiveAfterSceneLoad(((Component)c).gameObject))
                willBeActiveAfterSceneLoad++;
        }
        Debug.Log("BeforeSceneLoad. Will be Active after Awake, count: " + willBeActiveAfterSceneLoad);
    }

    static bool WillBeActiveAfterSceneLoad(GameObject gameObject)
    {
        Transform current = gameObject.transform;
        while (current != null)
        {
            if (!current.gameObject.activeSelf)
                return false;

            current = current.parent;
        }

        return true;
    }
}