Heh, I contribute to a FOSS social vr project called https://github.com/v-sekai and the majority of the multi year effort was asset pipeline, ik and animation blending. Yes we donated the code to Godot Engine but we choose working on the tooling problem rather than the game… The V-Sekai game is in limbo / not a game. We made godot-vrm which does 3d avatars, with basic animations, look at, jiggle and copy constraints. Since we’re unable to use the unity ecosystem’s finalik or unreal engine’s control rig we have to code to the same level of professional quality with no budget. Features like stable multi-joint y-branching rotation and position constraints are hard. Feel free to chat in V-Sekai discord. I’m iFire.