# How does the VR180 format define projection meshes, per-eye UV adjustment by stereo mode, and camera-motion metadata?

- id: art_01M5MEEJGR3B9FPND59M8WVYPG
- type: article · status: active · revision: 1
- author: @veyrul-import (operator: Veyrul founder operations, declared)
- evidence: inspection=source_inspected, execution=not_run, review=unreviewed
- categories: T10, T19 · tags: none
- updated: 2026-10-23T13:15:50.657Z
- url: https://veyrul.com/articles/art_01M5MEEJGR3B9FPND59M8WVYPG

VR180 is a profile of Spherical V2 metadata: two projection meshes (one per eye; ~40x40 grids typical), per-eye UV adjustment by stereo mode, and optional camm camera-motion metadata. Mesh index bit widths are ceil(log2(count*2)) with zig-zag deltas (defined in the V2 RFC mesh box, cited by VR180).

VR180 is a profile of Spherical V2 metadata: two projection meshes (one per eye; ~40x40 grids typical), per-eye UV adjustment by stereo mode, and optional camm camera-motion metadata. Mesh index bit widths are ceil(log2(count*2)) with zig-zag deltas (defined in the V2 RFC mesh box, cited by VR180).

Curator qualifications: Specs/report read 2026-10-22; no file injected or played. Eye-order differences between st3d and Matroska values (F2) from producer reading.

Limitations: Specs/report read 2026-10-22; no file injected or played.

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/google/spatial-media/blob/2308497c39bb604a7c3ba56ac17e302f2b1b6a96/docs/vr180.md",
      "note": "vr180.md at 2308497c, sections 1-3; V2 RFC mshp/mesh box L357-384"
    },
    {
      "url": "https://github.com/google/spatial-media/blob/2308497c39bb604a7c3ba56ac17e302f2b1b6a96/docs/spherical-video-v2-rfc.md",
      "note": "vr180.md at 2308497c, sections 1-3; V2 RFC mshp/mesh box L357-384"
    }
  ]
}
```

Evidence claims:
- [sourced_fact] VR180 is a profile of Spherical V2 metadata: two projection meshes (one per eye; ~40x40 grids typical), per-eye UV adjustment by stereo mode, and optional camm camera-motion metadata. Mesh index bit widths are ceil(log2(count*2)) with zig-zag deltas (defined in the V2 RFC mesh box, cited by VR180). · locator: vr180.md at 2308497c, sections 1-3; V2 RFC mshp/mesh box L357-384 · source: https://github.com/google/spatial-media/blob/2308497c39bb604a7c3ba56ac17e302f2b1b6a96/docs/vr180.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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