Since the first 3D breakthrough film Avatar premiered at the end of 2009, 3D films have been a big success worldwide. Mats Kullander, who is responsible at SF Bio in Sweden for installations for the cinema chain, explains how 3D technology functions.
What does it take for viewers to see more than the usual two dimensions on the big screen? The answer is simple: two pictures shown at once and a pair of glasses to see them with. But it's a bit more complicated than that.
When a 3D film is produced, it is filmed either with two cameras that are calibrated to capture the same picture but with a small lateral difference, or with one camera with only one lens but that can capture two pictures at once. Meaning that the effect is created during the filming and not done afterwards.