Re: Nulls, animating POI and cameras...

L.toWorld(L.anchorPoint) is only necessary if your POI layer has a parent. If it doesn't, you could just use L.position to get the world position of the layer.

In any case you use L.toWorld() instead of just toWorld() because you want to translate from the POI layer's layer space. If you use toWorld() without specifying the layer, the expression will assume that you want to translate the POI layer's anchor point from the camera's layer space, which doesn't make any sense.

When a layer becomes the child of another layer, it assumes the parent's layer space. So in this case, once we get the POI layer's positon into world space, we need to traslate it from world space to the camera's parent's layer space.

Hope that helps. ;-)

Dan