How do I do the mechanic in this video?

Development World Creation
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1

I would like to know how can I do that in unreal engine, allowing the player to walk on a sphere and make the gravity in the center of that sphere instead of a flat ground. Look at the following video: [Unity Game] Planet Punch - PAX AUS 2016 - YouTube .

2

There are 2 project samples from the user Mhousse1247 that uses custom gravity (Custom Gravity Project and Six DOF Project). Should be a great start.