Ehmmm... I'm sorry.. I've found all my VRay rectangular lights -.- It's because I've resumed this work after very long time and I've forgot that there where a layer for everything.. my background lights layer was unchecked I apologize if I've posted a useless thread

There are several tools that will reform a set of linked edges, arcs or curves into a single 'curve' entity. The original oldie 'weld' is available from Smustard.com [with several prompts as it processes the selection] Several other tools have something similar as part of a broader toolset... My own "TIG-weld" is available in the SCF PluginStore - it just does the one prompt-free 'welding' job on suitable preselected line/curve sets. http://sketchucation.com/pluginstore?pln=TIG-weld

I suggest you uninstall the versions in English or any other language. Then run the file (it.exe) SketchUp Pro 8. ( For Windows) The program will install itself in the Italian language. You will still need to enter the purchased license key (being "pro"). For updates on SU2013 and SU2014: Do not fail to install in other language versions. Otherwise it will be, later, impossible to install Italian versions: there will be several conflicts with the new platforms " Microsoft.NET Framework". Always remember to make a backup on an external disk before installing any program. (I use Acronis True Image). Ciao