To fit in with the Horizon team's extremely tight filming schedule, we needed the sandpit to be quick to setup on the day. Using a mirror mounted just above head-height, our brighter projector was able to fill the entire sandpit. We realised that by mounting the projector low-down and pointing it up at a mirror above the sandpit we could halve the height of the setup. To fit the setup into the Data Observatory (without demolishing the roof) we needed to come up with a better solution. When combined with eye-wateringly bright TV studio lights, a dim projector was out of the question.Īrmed with a much brighter projector we immediately hit upon a snag: this new projector was designed to be mounted a long distance from a screen and would need to be mounted several meters above the sandpit. To make matters worse, the Horizon team wanted to film the sandpit in Imperial College London's Data Observatory which features a floor-to-ceiling panoramic wall of (bright) monitors. Though cameras continue to get better in low-light conditions, the best pictures still require good lighting. Though in practice this still looks good to the human eye in a darkened room, the same can't be said for TV. Unfortunately these projectors aren't especially bright, particularly when projecting onto a non-ideal sandy surface. The original AR sandpit design used 'short throw' projector mounted at head-height above the sandpit to cover the whole pit.
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