University of Glasgow has developed a model that can create 3D image without a camera. The system makes use of four single-pixel sensors stitching together a 3D image based on the reflected intensity of light patterns cast by a projector.
“A digital camera focuses incoming light using lenses and then records the position and intensity of that light with a multi-pixel sensor. To capture a 3D image, two cameras are placed side by side, like eyes in a human head, and their slightly different views are combined on a computer.”
The video below explains it all: