Terragen has been giving me incredible skies and environments for many years now. The team has taken an exponential leap in terms of photographic reality. I have done several projects with Terragen 2 where it has generated lighting and reflection HDRIs and those became the only light source in the 3D renders. With the ability to load georeferenced DEM data so easily and so accurately, guesswork is gone and you can concentrate totally on image fidelity. It’s a piece of software I would not do without at this point. A serious primary asset in the tool belt.