Switchable smart film is a kind of film that when connect to power, it will become transparent, when power off, it will become opaque. And when in opaque status, it can work as a rear projection screen, which can help you to take any glass surface as projection screen if you already have smart film on the glass.
Rear projection theory:
Rear projection effects:
Switchable smart film/glass projection, when in transparent status.
Switchable smart film/glass projection, when in opaque status.
See another real project photos(Using 3 projectors for projection):
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