I am using vue xtream to design realtime environment when i import it into unity its separate it all the layers can you told me whats the problem is ? …
Wow, vue xtream eh? Fancy stuff!
I suggest generating a heightmap from your vue terrain, then rebuilding a Terrain object in Unity using your heightmap.
This will allow Unity to do real-time LOD of the Terrain geometry, which should significantly aid your performance.
You’ll also have to export the Textures and apply them to your terrain in Unity. You might even be able to generate a normal map for the highres details you don’t get from the geo.
If you’re just trying to get the actual model in, wihtout concern for real-time performance, then just export it as an FBX or OBJ. Should come in fine. If not post a screenshot of what you’re seeing so we know what’s going on.