I think the results you saw were somewhat deceptive. Essentially, what she was doing was capturing a very low-res version of that sandcastle (note the coarseness of that point-cloud) and mapping photographic imagery over it to create the illusion of a fully-detailed part that could be seen from any angle. That's fine if all you need is video, but if you wanted to 3D-print that sand-castle, you'd have very little detail and lots of holes from the shadows and gaps in that scan.

Andrew Werby
www.computersculpture.com