Theo Sulphate
Member
This principle is employed by amateurs too:
sliding one camera on a rod, or even displacing the camera with its tripod. But both means bear the risk of annoying movement of subjects inbetween.
Yes, I did that as a kid with my Baby Brownie 127 camera. I would take a photo, then move over about two or three inches and take a second one. I could put the prints side-by-side, then stare at them cross-eyed until the images merged into a 3D image. That technique worked pretty well.