@tpstigers said:
Sometimes, though, I just want to render a part of the landscape (a house, for instance).
Well, Thea has a really cool feature: region rendering. Combined with the Interactive render feature (where you navigate; orbit, pan, whatever to get the view you want and it is interactively rendering the "final" image - sort of) then make a rectangle selection and there you go; it will render you that part.
If you build the main features of your landscape in SU, you can add pretty high poly plants inside Thea (and later, when the exporting plugin supports it, you can place "dummy" proxies in SU and turn them into full fledged 3D plants in Thea).
Hm. Still selling at 45% pre-release price until the 21st of February (RC2 has just been released).