I did a good bit of research on 3D projection in the last few days, and there seems to be a number of different systems, both active and passive.
Barco and Christie both have 3D projectors with built in polarizers that allows the use of passive glasses and as I understand it allow projection on anything. Actually, Barco has a very good primer on the subject of 3D in general on their site that is well worth reading.
Another option that has been used mostly by home theatre enthusiasts involves using two identical projectors fitted with crossed polarizers, and passive polarized glasses, but it seems tat a special silver screen is necessary that preserves the polarization. There is also the issue of linear vs circular polarizers...Complicated.
Anyhow, I decided to test the concept on the model of the building wrapped with fabric, and borrowed Ralph's Optoma HD1060P(identical to mine). I stacked the projectors, lined them up, and projected the left image with one and the right with the other using photographic linear polarizing filters in front of the lenses. Nothing happened, it just didn't work. And a simple test showed why: if I hold another polarizer in front of the projector lens fitted with a polarizer and cross them, the image goes dark, but if just I look at the projected image through the polarizer instead, it has no effect, showing that the image projected on regular fabric looses polarization. Back to square one, we can't do it "homemade", and just have to hope we can get a 3D Barco or Christie...
Barco and Christie both have 3D projectors with built in polarizers that allows the use of passive glasses and as I understand it allow projection on anything. Actually, Barco has a very good primer on the subject of 3D in general on their site that is well worth reading.
Another option that has been used mostly by home theatre enthusiasts involves using two identical projectors fitted with crossed polarizers, and passive polarized glasses, but it seems tat a special silver screen is necessary that preserves the polarization. There is also the issue of linear vs circular polarizers...Complicated.
Anyhow, I decided to test the concept on the model of the building wrapped with fabric, and borrowed Ralph's Optoma HD1060P(identical to mine). I stacked the projectors, lined them up, and projected the left image with one and the right with the other using photographic linear polarizing filters in front of the lenses. Nothing happened, it just didn't work. And a simple test showed why: if I hold another polarizer in front of the projector lens fitted with a polarizer and cross them, the image goes dark, but if just I look at the projected image through the polarizer instead, it has no effect, showing that the image projected on regular fabric looses polarization. Back to square one, we can't do it "homemade", and just have to hope we can get a 3D Barco or Christie...
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