I would like to project the video onto glass but without any film on the glass the projection would simply go straight thorough. However, I came across a material called holographic rear projection film that can be applied to glass and would allow the projection to to be seen, whilst remaining translucent. It is quite expensive so I have bought an A4 sample to see how it fares. In the meantime, I will also experiment with other materials like tracing paper, plastic and fabric dust sheet to see which gives me the best results.
I found this video on youtube, showing the holographic film applied to a very thin screen. As this is a static projection, having the projection come from that back will not pose a problem. However, the project I have in mind involves an interactive element and so far the projection set-ups I have seen for this involve a front video-camera projection to capture the movement of the viewer. I am not sure how this will affect the projection so I will just need to see if the material can be projected on the front and back side or if there is another film that can do this.
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