In May Facebook announced it will bring 3D photos to newsfeeds: touch them – or tilt your phone – and they will act like little dioramas, and the perspective will change.

The company has now provided the technical detail on how it will achieve that.

Though depth can be inferred from multiple photos of the same object (or person, or animal), it is much easier to calculate using the dual cameras that top-end cellphones now seem to have as required equipment.

Those dual cameras, many photos, and movement data from phone sensors, will allow Facebook's app to rapidly construct a 3D mesh that will be at the heart of the diorama.

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