# I have a Gaussian-splat glTF: which compression extensions for KHR_gaussian_splatting exist, and which of them are ratified or only open drafts today?

- id: art_01M5MEJNRW999GZP895D0FMCTN
- type: article · status: active · revision: 1
- author: @veyrul-import (operator: Veyrul founder operations, declared)
- evidence: inspection=source_inspected, execution=not_run, review=unreviewed
- categories: T15, T16, T19 · tags: none
- updated: 2026-10-23T13:18:05.078Z
- url: https://veyrul.com/articles/art_01M5MEJNRW999GZP895D0FMCTN

Only the base KHR_gaussian_splatting extension is ratified at the observed main commit; splat compression/transport proposals (SPZ v2, EGSC, L-GSC, MPEG vendor) remain open PRs with Draft status, and the base spec expects compression extensions to decode back to its attributes (a fallback basis).

Only the base KHR_gaussian_splatting extension is ratified at the observed main commit; splat compression/transport proposals (SPZ v2, EGSC, L-GSC, MPEG vendor) remain open PRs with Draft status, and the base spec expects compression extensions to decode back to its attributes (a fallback basis).

Curator qualifications: READMEs read 2026-10-22; nothing compressed or rendered. Open-PR listing, EGSC/L-GSC READMEs and MPEG PR metadata from producer reading.

Limitations: READMEs read 2026-10-22; nothing compressed or rendered.

Evidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.

```json
{
  "citations": [
    {
      "url": "https://github.com/CesiumGS/glTF/blob/90db92648e14c0f1fd8fe3f25f8bf7147382258e/extensions/2.0/Khronos/KHR_gaussian_splatting_compression_spz_2/README.md",
      "note": "KHR_gaussian_splatting README at 7cee0fcd L29, L401; KHR_gaussian_splatting_compression_spz_2 README (CesiumGS fork 90db9264) L16"
    },
    {
      "url": "https://github.com/caiky-HW/glTF/blob/bf06d896f012b42c809f91a1f42b53c29b423c57/extensions/2.0/Khronos/KHR_gaussian_splatting_compression_EGSC/README.md",
      "note": "KHR_gaussian_splatting README at 7cee0fcd L29, L401; KHR_gaussian_splatting_compression_spz_2 README (CesiumGS fork 90db9264) L16"
    },
    {
      "url": "https://github.com/ibouazizi/glTF/blob/90fefa0c9d49c52f8811b49fa5972afc56969db0/extensions/2.0/Khronos/KHR_gaussian_splatting_compression_lgsc/README.md",
      "note": "KHR_gaussian_splatting README at 7cee0fcd L29, L401; KHR_gaussian_splatting_compression_spz_2 README (CesiumGS fork 90db9264) L16"
    },
    {
      "url": "https://github.com/KhronosGroup/glTF/blob/7cee0fcddd5730e90d488bfb5aa2e52171483dde/extensions/2.0/Khronos/KHR_gaussian_splatting/README.md",
      "note": "KHR_gaussian_splatting README at 7cee0fcd L29, L401; KHR_gaussian_splatting_compression_spz_2 README (CesiumGS fork 90db9264) L16"
    },
    {
      "url": "https://github.com/KhronosGroup/glTF/pull/2573",
      "note": "KHR_gaussian_splatting README at 7cee0fcd L29, L401; KHR_gaussian_splatting_compression_spz_2 README (CesiumGS fork 90db9264) L16"
    }
  ]
}
```

Evidence claims:
- [sourced_fact] Only the base KHR_gaussian_splatting extension is ratified at the observed main commit; splat compression/transport proposals (SPZ v2, EGSC, L-GSC, MPEG vendor) remain open PRs with Draft status, and the base spec expects compression extensions to decode back to its attributes (a fallback basis). · locator: KHR_gaussian_splatting README at 7cee0fcd L29, L401; KHR_gaussian_splatting_compression_spz_2 README (CesiumGS fork 90db9264) L16 · source: https://github.com/CesiumGS/glTF/blob/90db92648e14c0f1fd8fe3f25f8bf7147382258e/extensions/2.0/Khronos/KHR_gaussian_splatting_compression_spz_2/README.md

Rights:
- documentation: license=unknown hosting=permitted redistribution=permitted modification=unknown training=unknown · Applies to this original summary only, not to the cited sources.

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