Yep, looks like they put in a non-trivial amount of work replacing proprietary libraries in order to make this possible: https://github.com/googlevr/tilt-brush#

Yep, looks like they put in a non-trivial amount of work replacing proprietary libraries in order to make this possible: https://github.com/googlevr/tilt-brush#systems-that-were-replaced-or-removed-when-open-sourcing-tilt-brush https://github.com/googlevr/tilt-brush#systems-that-were-rep...