Hi
You might want to search the forum for the term "microexporter".
This is in no way meant as some kind of "rtfm"
but it will give you links to threads dealing with exporting terrains in a wide variety of scenarios.
And yes, the simplest way to export is using the microexporter and saving the resulting file as a *.obj.
Again, read up upon the microexporter and how it works.
I`ve attached a few pictures from a Unity scene where I imported a microexporter generated terrain as *.obj.
To microexport the terrain I used a spherical camera in TG (perhaps only available in the Pro-version - but ortho-
or perspective camera work well too), relatively high render quality settings of AA 6 and Micropoly detail of 0.6.
As I said camera=spherical and Far distance set to 1000m. This resulted in a *.obj of 612mb and roughly 1.8 mill polygons.
The TG Wiki explains how different render settings influence the microexporter.
Import into Unity was no problem (Import New Asset) but Unity split the object up into ~30 groups.
A obj imported is allowed to contain about 65000 polys or something, I think. That is what is in the attachments.
So, yes it is easy but you`ll have to do some clean up and figure out which degree of resolution you need in the game engine
before you export from TG. But I am by no means an avid user of Unity nor TG. Just curious to look into these kinds of problems
and find my way around
Hope it helps a little.
CHeers, Klaus