Hi there! Reply comes a full year later… hope it’s still of some use to someone. It’s been a while since I posted that, but if I recall correctly, I’m just trying to replicate exactly what Sjoerd does in the video to the best of my ability from lokoing at screenshots of the video and listening to what he’s saying – so for any explanation / “what is this doing?” type questions, I hope the video shows you what you need to know. 
That project I replicated this in is old and on another computer now, sorry…