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I used to do a lot of this sort of thing using 3D Studio Max. It has some really nice functionality that allows you to insert the photo of the room and then set up your rendering camera to match the camera used to take the photo. Then you simply maneuver your model around until you have it placed where you want it, in relation to the photo, and hit render. Of course, you have to set up your materials, and make sure the lighting matches the light sources in the photo and you have to place shadow catchers around the model to capture shadows, etc., but after you get everything set up, you hit render and you will get a complete image of the room and the furniture model without having to do any post work in Photoshop. Or you can render the model without the background image and composite in Photoshop. It's up to you. The downside to 3D Studio Max is that it's very expensive and it has a steep learning curve. So it may not be the best option for your situation. These days, I think most 3D programs have the same sort of functionality though, so like Steven-g said, it would be best to talk to your boss about what he expects. Some bosses want very simple, quick and dirty, conceptual style renders while others might want complete realism. It all depends on how fast it needs to be done and how much money is in the budget. In my experience, the boss always wants it done fast, cheap and great which is a complete impossibility, as the graphic below illustrates.

Why not use the code by Omega-thunder ? I had a bit of play with it added multi picks. It needs check picked a valid object pline or circle. And Material type say add Aluminimum. The code by Jeffery sanders has nearly any type of material which is good but adds overheads. (Defun C:calculate (/ Poly Thick sc Pt Vol) (setq Thick (getreal "\nGive Thickness in MM: ")) (setq sc (getreal "\nGive scale value 1 0.1 0.001 : ")) (while (setq ent (entsel "\nSelect Polygon:")) (setq Poly (vla-get-area (vlax-ename->vla-object (car ent)))) (setq Pt (getpoint "\nPick point of text placement: ")) (setq Vol (rtos (* Poly 7.85 Thick sc) 2 3)) (command "_text" Pt 20 0.0 Vol) ) (princ) ) (C:calculate)

Thank you for your kind words, Rita. Re: siding. Actually what you are dealing with is referred to as metal decking. In this case P-F is not only using metal decking in the floor and roof slabs but also as exterior and interior siding. Metal decking is used in a wide variety of commercial and industrial applications. It includes steel roof and floor decking, aluminum floor decking, and acoustical metal decking. Metal decking typically has a ribbed or corrugated profile that is achieved through a process called roll forming. Metal decking comes in many forms. It is available as standing seam, corrugated, batten panels, box ribbed (used in the project you are currently doing), flat panel, etc. BTW...the website you referenced in your post above is actually one based in the UK (Great Britain). The terminology, while similar in many cases, will be different as well as construction standards however the basic design principles will apply whether a building is built in the UK or the U.S. Try searching on architectural terms and definitions or on specific topics such as "metal decking" as an example. Or...just ask. We have numerous members with a variety of backgrounds here at CADTutor. I'm sure there will be someone to answer your question.