Originally I was going to use Terragen cause I really liked the skies, which are not that hip in Bryce... When I saw Vue d'Esprit, I realized that it was a much better program with gorgeous skies... So I forgot about Terragen... Considering that it's a free application, it's a great program if you've never worked with Bryce or Vue... But by now with Vue 4, really, you can do just about anything...