Alexey, Okay. I think I'm tracking.
So let's say I put a number of colourful 1" diameter stickers on the floor around the model, for example. Pink, red, green, whatever. They might not be visible in every camera (some cameras are close-up on the head).
When I get my shots into Photoscan, I then put a marker on each of these different coloured spots in as many photos as they show up in (or does Photoscan get the idea after the first few and place markers itself?).
And then I tell Photoscan how far apart these markers are, having measured them on-site. I'm not sure how to do that so perhaps you can point me to a page in the Help or something.
But overall, does that sound about right?
Jon