Attached Link: The appartment tutorial

*"It's still not clear whats going on. The links seems to go to the same stuff thats in the documentation which to me seems not clearly written. It reads like someone from a foreign country trying to write english."* That is actually true, Julien Chaplier is from French, I presume.You might consider writing to julien himself. (I am Dutch so English is not my daily language) Shading multiple domains can be done after clicking the 'plus' sign under the shader tree and choosing another 'basic layer' The above picture is from Inagoni's site (the appartment tutorial, it will lead you through the steps, I think). That is where you choose your window, after selecting the right hole. Hope this helps. People tell me I use both my brain parts, so I am not sure if this is the right addition for you.