After projecting on acrylic blocks and transparent film paper, I wanted to try a material in between, which is less refractive than acrylic but thicker than the transparent films. I decided to build some screens with plexiglass. However, the the projection went through the plexiglass when the protective plastic sheets were removed. After some research I found that projection on glass is only possible with a back projection film. Instead of projection film, I tried with transparent window films. With the transparent films, the projection on the plexiglass is possible, although the image becomes less clear the more screens they go through.
First Test:
The last image is on the wall.
The middle screen is with the protective sheets it came with
The front most screen is with the transparent film
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