- including real and virtual 3D displays
Real 3D displays project a moving image into space. These are called ‘volumetric’ displays. The user sees a three-dimensional image in the air.
There are a number of way to produce this effect, we are still quite a bit away from Star Wars Holograms
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Virtual 3D requires the user to have a separate image for each eye. This generally involves the user wearing a virtual reality headset or special glasses to provide the different images.
This is the type of 3D you get at the cinema, the glasses create two images (one for each eye)
You might want to stop this video at 7 minutes, but feel free to watch on for the full Physics run through of how cinema 3D works.
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