Blender VTuber Avatar Build Hits VRChat Humanoid Rig Wall
The piece documents a practical workaround for VRChat's Humanoid-only rig limit, showing how a non-humanoid Blender model can be adapted through dummy bones and weight painting.
Reporting from 1 source: ASCII.jp.
A VTuber creator using Blender to build a VRChat-ready 3D model of their character kyunrobo hit a major snag: VRChat only supports humanoid rigs. The multi-jointed arms and four legs did not fit the Humanoid standard, forcing a redesign with dummy bones and manual weight painting before the avatar finally worked in VRChat.
VRChat only moves humanoid rigs, which is a problem when your avatar has four legs and extra arm joints. The creator behind the kyunrobo avatar found that Blender's automatic weight painting did not match the Humanoid bone structure, so the arms bent incorrectly in VRChat.
The fix was to delete the extra arm bones, rebuild a Humanoid-compliant skeleton, and manually assign weights to every hard part using edit mode. The creator notes that finding documentation for weighting rigid parts was difficult, and ChatGPT eventually provided the solution.
After getting all parts moving correctly, the avatar gained eye movement and lip sync. The remaining issue is the avatar's 30 cm height, which causes it to sink into the floor in VRChat.
Synthesized by Yomimono from the 1 cited source below, including Japanese-language reporting where cited, then editorially reviewed before publishing.