How large may the floor area be?+
We quote no limit in square metres, because the answer depends on the building and not on a number. What decides it is how you cut the walk up: you film in sections and upload each section as its own capture. A large production hall becomes several captures instead of one that is no use to anybody.
What do I need besides a phone?+
A device with a 0.5× ultra-wide lens that records 4K at 60 frames per second, and light in the building. No tripod, no tape measure, no marker and no survey trolley: the scale comes out of the walk itself, and the delivery is metric. If you happen to know one distance on site, you can type it into the viewer and calibrate the scene against it — you do not have to.
Does the model show anything up on the high racking?+
Whatever you filmed is in the model; whatever you did not film is not. From eye height you see the upper shelf levels at a steep angle from below, so they are there as a surface but not as a clean solid. If the top levels are what matter to you, film the aisle a second time and hold the device higher or tilt it up.
Can several walkthroughs belong to one building?+
Yes — a site holds any number of captures, and each section is one of them. They are not added together: you get one delivery per section, and each one stands in metres on its own. Merging several sections into a single model is not built, and so we do not claim it.