Scene.Push(), BatchGroup(), FindInPhysics, and FindAllWithTag — Scene Context Management

var myScene = new Scene();

using ( myScene.Push() )
{
    // Game.ActiveScene == myScene here
    var go = new GameObject( true, "MyObject" );
    go.AddComponent<MyComponent>();
    // go is created in myScene
}
// Game.ActiveScene restored to previous scene

using ( Scene.BatchGroup() )
{
    // Create many objects — callbacks are deferred
    for ( int i = 0; i < 100; i++ )
    {
        var go = new GameObject( true );
        go.AddComponent<MyComponent>();
    }
    // All OnAwake, OnEnabled etc. fire here in deterministic order
}

// Create a GameObject on a specific scene (doesn't require it to be active)
var go = myScene.CreateObject( enabled: true );

// Find all GameObjects with a tag
var players = Scene.FindAllWithTag( "player" );

// Find all GameObjects with all tags
var activeEnemies = Scene.FindAllWithTags( new[] { "enemy", "active" } );

// Find GameObjects overlapping a sphere
var nearby = Scene.FindInPhysics( new Sphere( position, radius ) );

// Find GameObjects overlapping a box
var inBox = Scene.FindInPhysics( new BBox( mins, maxs ) );

// Find GameObjects in a frustum
var inFrustum = Scene.FindInPhysics( frustum );