EXAMPLE FILE FROM VIDEO: https://github.com/sideeffects/SideFXLabs/tree/Development/hip

Pivot Painter is a sop that stores model pivot and rotation information in the model's vertex data and additional UV channels for PP1, and in textures for PP2. That information can then be used inside of Unreal's shader system to create interactive effects.
This tool is specifically built to work with the material functions provided by Epic Games in Unreal Engine. It is however possible to use this encoded information in other engines such as Unity, since it uses common attributes and textures. https://docs.unrealengine.com/en-US/Engine/Content/Tools/PivotPainter/index.html