Is it possible to export a scene from unity to max???
Unity or some editor extension has this function?
Ok, thanks very much.
Unity uses fbx format, you can export your scene right into max, with some limitations but just as importantly you can export your scene from max, which is great to use as a level editor.
I already tried to open unity assets in max. And I don’t see any fbx exporter in unity.
Now i’m using the objexporter twiesner linked up.
Unity reads FBX, Indeed. Just export your 3dsmax file to an FBX manually ( So Unity doesn’t need to convert them ) Also, convert any splines to poly or mesh because Unity doesn’t like splines 
There is no Unity built-in FBX exporter (would be nice :)) but I used to use Ranza’s tool to export whole Unity scenes to 3dsmax. It’s still available but not updated since Unity 3x http://masteranza.wordpress.com/unity/lightmapping/
For idividual game objects you can use ExportOBJ http://wiki.unity3d.com/index.php?title=ExportOBJ