Okay, the first reply was just off the top of my head. It turns out that the process is very straightforward.
Import (as a Match Photo) a larger screen grab of the intended projection…one showing the base of the desk.
Line up all the perspective lines in the usual way, then when you are done, start your model by drawing a single line along the base of the desk in the photo. In my little mock-up, the rest of the desk is based on this. If you’ve already got a model of the desk, I guess you could import that and align and scale it to match that single line.
Once the desk is in place, the rest of the room can be modelled around it…including the wall and screen.
Next…in the match Photo dialog (which is greyed-out except for when you are in the Match Photo scene) click the button to project the image onto the model. Then get rid off this projected texture on everything other than the screen.
Lastly, click on the scene tab again to get everything back in perspective…then go to the Scenes dialog and delete the scene. Finally…taking care not to move the viewpoint in any way, create a new scene that is exactly the same viewpoint as the one you;ve just deleted. Only this time it doesn’t have the Match Photo image overlying everything. This is the scene that you will render. I’ve attached a skp as well as the pic.
office.skp (124.0 KB)