What's the difference between runRenderLoop() and registerBeforeRender()?

Questions
1

What’s the difference between these two approaches? In both cases I call calcBeforeRender() before scene will be rendered. So what the difference?
1:

scene.registerBeforeRender( () => {
    calcBeforeRender();
} );
engine.runRenderLoop( () => {
    scene.render();
}

2:

engine.runRenderLoop( () => {
    calcBeforeRender();
    scene.render();
}
2

Normally a game can have one engine and multiple scenes. If you use registerBeforeRender you don’t have to check if sceneN is active in your runRenderLoop:

if(scene1.isActive) { … }
if(scene2.isActive) { … }
…

So you can execute instructions that are scene-specific and others that are global (for all scenes). With only one scene, there is no difference. Additionally it could be that you don’t own the engine/runRenderLoop like in Playground.

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