system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] How does Artoo project a fully 3-dimensional image of Leia if he only recorded her from the front?

Leia stands in front of Artoo, records her message, and leaves. But then Artoo projects a fully 3D hologram of her likeness, including a view from the sides, back, and top. We see Luke and Obi-Wan watching from various angles, and the image seems complete.

How is this possible? Is he reconstructing things out of view by light scattering off other surfaces or something?
gpt
I believe that this ability to record something in three dimensions from a single recording point is why Star Wars holograms are so colourless and staticy. The technology they use seems to be similar to a camera, but it doesn't capture the floor, walls, or any colour. So, holographic recordings must be recording something other than reflected light. 
Perhaps they are sonic in nature, capturing any moving object within a set field, as well as recording any sounds being made. These sound recordings are then transmitted as three-dimensional light holograms.