Appendix A: Complete Implementation Inventory
Full list of all implementations discovered beyond the Top 35 featured in the main report.
| Name | Organization | Type | URL | Notes |
|---|---|---|---|---|
| Infinigen | Princeton | Open Source | github.com/princeton-vl/infinigen | Blender-based procedural photorealistic worlds |
| ZiYang WorldGen | Academic | Open Source | github.com/ZiYang-xie/WorldGen | Text-to-3D scenes, Gaussian splat output |
| EmbodiedGen | Horizon Robotics | Open Source | github.com/HorizonRobotics/EmbodiedGen | Six-module generative engine with physics |
| stable-dreamfusion | ashawkey | Open Source | github.com/ashawkey/stable-dreamfusion | Popular SDS implementation |
| GaussianSplats3D | mkkellogg | Open Source | github.com/mkkellogg/GaussianSplats3D | Three.js Gaussian splat renderer |
| Webaverse | Webaverse | Open Source | github.com/webaverse | AI-first metaverse, procedural worlds |
| Baidu XiRang | Baidu | Commercial | xirang.baidu.com | Chinese industrial metaverse |
| NetEase Yaotai | NetEase | Commercial | yaotai.163.com | Chinese virtual events platform |
| Cluster.mu | Cluster | Commercial | cluster.mu | Japan’s largest metaverse platform |
| Zepeto Studio | Naver | Commercial | studio.zepeto.me | K-pop focused avatar/world creation |
| Ready Player Me | Ready Player Me | Commercial | readyplayer.me | Cross-platform avatar system |
| VRoid Studio | Pixiv | Free | vroid.com | Anime avatar creation |
| Avaturn | Avaturn | Commercial | avaturn.me | Realistic avatar from photos |
| Tafi | Tafi | Commercial | maketafi.com | Character creation engine |
Categories Not Covered in Main Report
Academic/Research
- Infinigen (Princeton)
- ZiYang WorldGen
- stable-dreamfusion
Regional Platforms (Asia)
- Baidu XiRang (China)
- NetEase Yaotai (China)
- Cluster.mu (Japan)
- Zepeto Studio (Korea)
Avatar-Focused
- Ready Player Me
- VRoid Studio
- Avaturn
- Tafi
Appendix B: Research Sources
All sources used in this report.
| ID | Type | Title | Author/Org | Date | Location |
|---|---|---|---|---|---|
| [1] | Research Mining | 01-scope-definitions.md | WG Analysis | 2025-12-14 | research-mining/ |
| [2] | Research Mining | 02-consumer-types.md | WG Analysis | 2025-12-14 | research-mining/ |
| [3] | Research Mining | 03-natural-divisions.md | WG Analysis | 2025-12-14 | research-mining/ |
| [4] | Research Mining | 04-domain-relationships.md | WG Analysis | 2025-12-14 | research-mining/ |
| [5] | Research Mining | 05-surprises.md | WG Analysis | 2025-12-14 | research-mining/ |
| [6] | Research Mining | 06-terminology.md | WG Analysis | 2025-12-14 | research-mining/ |
| [7] | Standards Research | CONSOLIDATED-FINDINGS.md | WG Analysis | 2025-12-15 | standards-deep-dive/ |
| [8] | Standards Research | R1-khr-gaussian-splatting.md | WG Analysis | 2025-12-15 | standards-deep-dive/ |
| [9] | Deep Research | world_models_deep_research.md | Decision Framework | 2025 | world-models-decision-framework/ |
| [10] | Survey | AI-Generative-World-Creation-survey.md | MSF Research | 2025-12 | Generative-3D research |
| [11] | Synthesis | deep-research-synthesis.md | Research Agent | 2025-12-11 | metaverse-creator-interop/ |
| [12] | Use Case | USE-CASE-AI-GENERATED-3D-ENVS-FINAL.md | WG Output | 2026-01 | output/ |
| [13] | Specification | glTF 2.0 Specification | Khronos Group | 2017+ | registry.khronos.org/glTF |
| [14] | Specification | C2PA v2.2 Specification | C2PA Coalition | 2025-05 | c2pa.org |
| [15] | Specification | OpenUSD Documentation | AOUSD | 2024 | openusd.org |
| [16] | Blog | Khronos 3DGS Announcement | Khronos/OGC | 2025-08 | khronos.org/blog |
| [17] | GitHub | KHR_gaussian_splatting PR #2490 | Khronos | 2025 | github.com/KhronosGroup/glTF |
Source Categories
Working Group Analysis
Sources [1]-[8] - Internal research mining and analysis conducted by the AI x Metaverse Working Group
Deep Research
Sources [9]-[11] - Extended research synthesis and decision frameworks
Official Specifications
Sources [13]-[15] - Published specifications from SDOs
Community/GitHub
Sources [16]-[17] - Public discussions and draft specifications
Appendix C: Methodology Notes
Research Collection
| Aspect | Detail |
|---|---|
| Models used | Claude Opus 4.5, Gemini 1.5 Pro (historical research) |
| Queries executed | 50+ deep research queries across 6 months |
| Date range | December 2024 - January 2026 |
| Primary sources | GitHub repositories, SDO specifications, company documentation, academic papers |
Maturity Assessment
| Aspect | Detail |
|---|---|
| Assessment date | January 2026 |
| Assessor | AI x Metaverse Working Group |
| Validation | Cross-referenced against multiple research agents; verified against primary sources |
| Implementation counts | Validated against public metrics |
SRL Score Assignment
SRL scores were assigned using the following process:
- Evidence Collection - Gather data on funding, user counts, deployment status
- Level Mapping - Map evidence to SRL scale criteria
- Cross-Validation - Compare against peer implementations
- Consensus Review - Working Group review and adjustment
Limitations
| Limitation | Impact | Mitigation |
|---|---|---|
| Vendor documentation may be aspirational | Some capabilities may be overstated | Cross-reference with user reports |
| SRL scores are estimates | Some subjectivity involved | Document evidence for each score |
| Rapidly evolving field | Findings may become outdated | Plan 6-month refresh cycle |
| Limited SDO access | May miss unpublished discussions | Engage through MSF liaison channels |
Appendix D: Change Log
| Version | Date | Changes |
|---|---|---|
| 1.2 | 2026-01-26 | Fixed markdown formatting for GitHub/Obsidian compliance |
| 1.1 | 2026-01-26 | Fixed citation format consistency; updated Appendix B with full source paths |
| 1.0 | 2026-01-26 | Initial release |
Appendix E: Quality Checklist
Before publication, the following items were verified:
- All SRL scores have cited evidence
- All Top 10 implementations have complete profiles
- All gaps have severity ratings
- All recommendations have rationale
- No [NEEDS CITATION] flags remain
- Executive summary reflects body content
- All URLs verified accessible (pending verification)
- Terminology table complete
- SDO coordination map current
Appendix F: Glossary Quick Reference
| Term | Definition |
|---|---|
| World Model | AI system that understands dynamics and generates interactive simulations |
| 3DGS | 3D Gaussian Splatting - neural representation using Gaussian particles |
| SRL | Standards Readiness Level - maturity assessment scale |
| glTF | GL Transmission Format - Khronos 3D interchange standard |
| USD | Universal Scene Description - AOUSD scene interchange standard |
| C2PA | Coalition for Content Provenance and Authenticity |
| MSF | Metaverse Standards Forum |
| KHR | Khronos ratified extension prefix |
| Navmesh | Navigation mesh - geometry for NPC pathfinding |
| PBR | Physically Based Rendering - material workflow standard |
Appendix G: Contact and Feedback
Report Maintainer: AI x Metaverse Working Group
Feedback Channels:
- MSF internal channels
- Working Group meetings
- GitHub issues (if published)
Next Scheduled Review: Q3 2026