Thanks Oshyan / Dune

@ Dune: could you please explain your question? - I think I used no billboards...
As I understand, billboards are just used in the 3D preview beyond a certain distance, but I can't change this at any setting.
Working on my pictures, I usually use textured view for detailed work on single objects (the car's shaders / the falcons position and orientation...)
For overview of big populations I use the boxed view.
For rendering I mostly use population-setting "high quality".
But if there's a option to use billboards for increasing rendering speed (3D-preview as welcome as rendering

) without visible quality loss, please teach me. I didn't find the term billboards at any tutorial or the Terragen-Wiki except the 3D-preview I described above. I still only know app. 2-3% of the Terragen3 possibilities

PS: I changed the 3D-version to a brighter one some minutes ago. Unfortunately with red-cyan glasses it becomes too dark. On the 3D TV/monitor it looks great. If someone is intersted in the jps or mpo, just pm me.
Modified 01:20 pm:
@ Dune: perhaps I understand now, what you mean !? The "dead trees" seem to have a kind of frame as if inserted via not perfectly cut photoshop-layers, right?
The "dead trees" are in fact regular objects, but no Xfrog-plants... they were 8-10 "winter-tree" objects in one 3DS file and I had to separate them via 3DWings. Perhaps I made mistakes... I am absolutely untrained in using it.
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Anyway I found out, that I HAVE Xfrog winter-trees, but I just forgot to download them into my library... It's just too big after the last xfrog 70%-sale

So if this is, what you meant with billboards, I hope I can repair it coming weekend after downloading "EUROPE 3" from xfrog