thanks Teddy. I did a whole lesson about this confusing sunbrust switch and the by products of changing the render order
and now I really want to make it in a video tutorial (which would be my first),
seems like there's bits and pieces of it on the net but never the whole picture as I see it in one go.
so I need to get around to it and you guys of course will be the first to know and critique.
these are the resources I know about: