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Skycatch is already doing 3D modeling of huge areas using autonomous robots: https://vimeo.com/81128563

Except this isn't 3D modeling of huge areas. This is a drone that can navigate using no other sensors or input except for the Tango.

It's SLAM in a 3 dimensional space without the expensive and cumbersome lasers.

I suppose tango doesn't work so well in direct sunlight?

skycatch appears to be doing realtime 3d mapping though as well.

I don't think skycatch is doing realtime 3d mapping. Most likely they're using photogrammetry that takes a couple hours to process after the flight.