In regards to interior of the buildings, I have accomplished something but I dont think thats how they do it. Basically, I clone window itself and move it inside so its touching the window. Then I apply defuse map to window , say for example sky bitmap, I set transparency to some reasonable value. After that I find some picture of interior, like for example chairs, tables, curtains and stuff like that, and map it on cloned window. That way original window is see-through, and it shows the cloned window with mapped interior stuff on it. Its not as efficient I know and they probably do it some other way but it can yield pretty good results. Honestly, Id like to see MaxisBrian give us some more tips and tutorials. Namely, Id like to know how they accomplish contrast on textures and stuff. I mean, I use bump map and texture for example bricks, that come with 3D studio max, but when rendered , most of the detail gets lost due to antialiasing. :-x