The plugin includes two components and one animation node.

1. Custom Hand Skeletal Mesh component for implementing hands in VR. Fingers solver allow to switch between fingers poses, to trace world to grab objects, to receive input from Oculus Touch/Valve Knuckles/VR gloves (with 1 DOF). It supports skeletal meshes with or without arm bones. See documentation for skeleton requirements.
2. Body Solver, actor component to predict spine orientation. it's responsible for shoulders placement and hands scaling. Requires two-steps body calibration.
3. Fingers Solver: animation node to control humanoid fingers at any skeletal mesh (including full-body models). It works as a separate system and isn't needed for Hand Skeletal Mesh component, but useful to implement unified input from motion controllers with fingers tracking (Oculus Touch, Valve Knuckles) or VR gloves.

Fingers Solver also can be used to capture fingers animationin Unreal Editor and blend it to existing full-body animation.

Video #1 | Video #2 (demo with Valve Knuckles) | Video #3 (OpenXR features)

Video tutorial: Fingers Solver for any skeletal mesh

Video: Fingers mocap in Unreal Editor