Project Tango has a Unity project for getting started with AI rebuilding your physical environment into meshes as you walk around.
https://developers.google.com/project-tango/apis/unity/unity-getting-started
The Verge reviews Project Tango –
http://www.theverge.com/2015/5/29/8687443/google-io-project-tango-augmented-reality
Purchase a Tango –
https://store.google.com/product/project_tango_tablet_development_kit