Video narration
Could a few phone photos measure an object's shape, or do you need special scanning hardware? Imagine walking around an object, taking pictures from different angles. One photo shows a flat view. But when photos overlap, the same edge, corner, or surface mark appears in several images. Then the photos stop being just pictures. Those repeated details give software something to compare. As each shifts between viewpoints, software works out the camera positions and the object's depth. It infers depth from differences between views, not from a single photo. More overlap gives more information. Combine those measurements, and the snapshots become a 3D model: a digital shape built from pictures. This process is called photogrammetry: using overlapping photos to rebuild shape. So, do you need a special scanner? No. It turns phone photos around an object into a 3D model by comparing shared details across overlapping views.