Open a model at 0xr.space, press View in your space on a Meta Quest 3 or 3S or an Android phone with ARCore, then press Zero on the dock and ask: what is this? While you speak, and only then, Zero looks at what the camera sees. It answers aloud in the language you speak, and you can go on: what is it made of, find a 3D model like it.
The camera has to be allowed already; on a Quest that means Headset cameras for Browser. Its answer can be wrong, so check anything that matters. It sees the room, not the 3D model you have open. Zero is a free preview with a daily allowance.
No. Zero looks only while you are talking to it, and not while you are silent.
See the privacy page at https://0xr.space/privacy/ for what the camera features send and keep. 3D files you open are not sent.
The camera is not allowed, or on a Quest only Virtual cameras were allowed. Turn on Headset cameras for Browser in the Quest's Settings, under Privacy & safety, then ask again.
Not while you talk: Zero looks only where you see the room through the camera. It can still take a look when a question needs it, if the camera is allowed.
Scan draws named boxes and makes a 3D model of the thing you press. Asking Zero only gives an answer.