I use Geocontrol 2 along with Vue. It enables exports of 16 bit tiffs.
Once you have the tiff, you can import it in Vue this way (taken from the Geocontrol forum):

1. create a 256*256 standard terrain
2. convert to procedural terrain
3. open the procedural tab
4. right click on the preview in the tab for opening the procedural editor
5. load the exported 16 bit tiff
6. set the interpolation for the texture map to bicubic
7. close the terrain editor
8. render the terrain

This gives really detailed terrains especially when using 2048 or 4096 resolution.
You can also use Geocontrol selectors on them.

Here is an example (using a 2048 terrain)

Fantasy pictures, free 3d models, 3d tutorials and seamless textures on Virtual Lands.