>> And other thing : does the "Native functions" can work only from them ? So making "Orient" just with them...

Actually there are 2 parts of nodes : native and extensions

So i will to know for example if native Orient can be used only with native nodes for obtain an exact results !
Because it was created before the extensions!

Problem for the moment i can't find a simple trick for have the good result!
Difficulties (for me) is transform a selection in a "frame" usable! :)
Orient something following a line or a face...surely trivial but...