Screen material choice will depend on how large your windows are and how far away your audience is.
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I've used various things in windows to back project onto. Rosco RP screen is awesome, but very expensive. there are various films that you can apply directly to the window but these will need to fit exactly, otherwise you get bright lines appearing on the edges. If your window is higher than the audience and you project from the floor of the room then you don't get that nasty back-projection hotspot issue, so you can get away with using cheaper screen materials - I tend to use basic cotton sheeting stretched on frames and clamped to the window frames, but then I always seem to be working to a tight budget. I built an RP screen using a lightweight rubbery material - I think it was the kind of stuff that hospitals use to protect mattresses. That worked really well.
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I discovered two issues last year when projecting onto window screens in different rooms - I had 6 projectors over 2 floors - that the projectors need to be the same, with similar lamp life, and with a bit of luck they will output something similar. And that you need a solid solution for mapping. from inside the building I couldn't see the whole image so I needed somebody outside on the to guide me with tweaking the map, even though I had designed the content to be as simple as possible and to compensate for the difficulties of the building.
Fubbi's idea of blasting as many lumens as you can find onto dirty glass is a good solution if you have the right place to project from.
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