Ohhh ok.
This isn't something that is easy in Construct, since Construct's 3D support isn't great and even I don't know a whole lot about it, meaning I don't know what to do. (Unless I'm still not understanding what you are trying to do). It might be better to try and get someone more experienced such as dop2000
If I ever find a solution I will let you know, but until then, I can't help much...