Hi Massimo, you're right, it's still the great Terragen set of tools to create skies in TG4 that produce the best results. What Terragen Sky does for me is that it provides a more modern interface to 'design' clouds, and it, at least for me, really makes it easier and simpler to get a 'look' that I want. I don't really think that TGSky is a 'stand alone' product at this time, especially if you want the full range of the possibilities of TG4. I do think that for many HDRI lighting purposes it would be great though. As a glimpse into what TG5 might look like, it's a nice step forward, and does facilitate a more productive approach to cloud creation. BTW, none of the examples shown used the internal networks or blue nodes. I don't think that I ever would have put together 100 skies with the old interface, but who knows.