Don't buy the structure sensor!
This app, and all others, are more or less useless. Ones that don't crash are just money spinners, and even today the few apps available are mostly for shoes or spectacles. The room stuff makes pictures. Yeah, great. Most of the apps, you can't save an image, only send a 3D file, and of course log on, give your details etc. what a louse setup. Wish I’d never bought one. The update from the mark 1 to the mark 2 is offered with a small discount, but only to users in the USA. AND IT'S VERY expensive. Avoid!