Thanks for all the comments and suggestions.
@Oshyan: I meant to create just a sort of water leaking through a hole, rather than a real waterfall (even if I gave that definition), so that is why I didn't put some mist down there. About the kangaroos rendered in TG, here is a cropped render, but as I mentioned earlier no fur on these, as I used those just for placeholder reasons. I'll probably see if I can rework some displacement on this, but no promises as there is never enough time to do things as I'd like to
@Dune: yes I wanted to see if I could use a water shader efficiently with a mesh such a waterfall in this case. After many attempts, my answer was no. I wasn't able to create any reflective, shiny and "wet glossy" look on the waterfall mesh. I'm not sure if one can create a network of nodes to simulate such, but the water shader itself takes ages to render, and I hate time ticking
I'd love so much to see the TG renderer being able to handle a higher variety of materials that don't fall into the category of terrains and partly water. Say I'd like to get some proper SSS, more "modern" shiny and complex shading capabilities (see for example what ZBrush, Keyshot, Maya itself are able to accomplish), so that all kind of surfaces can be replicated. Dreams, I know, but it doesn't hurt to share thoughts. And along with SSS of course backface lighting so that finally leaves look good also close to camera (again, even playing with specularity maps, I've never been able to get some glossy, shiny look on leaves that need strong highlight areas). And my wish list would go on (transparency on OBJ's, displaceable OBJ's, multi-type populator node and so on...)
In any case, here attached comes the waterfall OBJ, in case anybody likes to try:
http://www.alessandromastronardi.com/xp/waterfall.obj.zipThanks to bigben for the hints about the australian vegetation (I had already the idea that not all the plants used were coherent with reality), and all the other folks as well.
Terragen is an excellent application, and I'd love so much to see more features coming in regularly and more often so that it could become a complete suite capable of serving multiple purposes.