Convert+glb+to+vrm+better

Background and Related Work

Problem Statement & Requirements

Method

Skeleton & Humanoid mapping:

Blendshape transfer:

Animation retargeting:

Texture atlasing & mesh simplification:

Export & validation: produce VRM header, humanoid metadata, blendshape groups, and validate against VRM schema.

Implementation Details

Evaluation

Ablation studies: material baking vs shader mapping, atlas vs separate textures, with/without blendshape consolidation.

User study: perceptual preference.

Results

Discussion

Conclusion & Future Work

Appendix

To convert well, you need an intermediate step. Here’s the professional pipeline:

The foundation of a quality VRM avatar is a clean rig. In a professional workflow, the creator imports the GLB into Blender and ensures the armature matches the VRM humanoid standard.

Not every GLB is worth converting. For best results, the GLB should:

If your GLB fails these, consider re-exporting from the original modeling software (e.g., from Blender with VRM in mind) rather than converting. convert+glb+to+vrm+better

True better conversion is re-rigging, not remapping.

VRM expects a specific humanoid structure with normalized bone scales, specific roll angles (e.g., upper arm roll 0°, forearm roll 0°). GLB often has arbitrary rigs.

✅ Better = auto-corrective rigging:

To convert better, you must speak the language. Background and Related Work

The Core Problem: A GLB uses "Standard" bone names (Hips, Spine, Neck). A VRM uses those plus special bones (LeftShoulder, RightToeBase) and requires specific scale constraints. A bad converter loses the connection.