I love Terragen too. I use it only to have a distant backdrop for Poser, when I know I won't do any rotations. I've played with the parent-child settings a bit and it is quite flexible and stable. Yeah, it needs vegetation, but for that bleak landscape look it is great. And the skies rival anything I've seen in Bryce (OK, a bit of hyperbole there.) I've also checked out Genesis II, but haven't played with it too much yet. Seems this is better for an altitude view than ground level.