Hi, your sample plan isn't really per how Chief would work as technically you are standing outside looking at a single wall...... which for a 3D lighting Engine is a whole different ballgame......  so normally I'd build build a 20'x30' house with roof and monoslab foundation and add  some lighting (cans) and more Windows for a true to life representation........   As Rene pointed out use 3D Trees not Tree Images from the Library.   Turning Off Refraction in RTRT wil