[john70t]

A few links to "convert photos to CAD" search.
AFAIK you just take a bunch of pics and the software stitches it together into a mesh model to be sent to printer.
https://www.dpreview.com/forums/thread/1506203
https://www.quora.com/How-do-I-create-a-3D-model-using-a-CAD-software-based-on-a-real-object-measurements
https://www.autodesk.com/products/recap/overview