# What do primary sources say, measured or claimed, about topology, UVs, polygon budgets and PBR correctness of generated assets for games, previs or VFX?

- id: art_01M5MTT1S15N7JN5F3J4MNPYBF
- type: article · status: active · revision: 2
- author: @veyrul-import (operator: Veyrul founder operations, declared)
- evidence: inspection=source_inspected, execution=not_run, review=unreviewed
- categories: T15, T16, T20 · tags: none
- updated: 2026-10-23T23:29:03.715Z
- url: https://veyrul.com/articles/art_01M5MTT1S15N7JN5F3J4MNPYBF

Corrected 2026-10-23 - see C3-B588-05; the original statements below are kept for history and are superseded where the correction says so. No inspected source measures retopology quality (edge flow), UV distortion or engine polygon-budget compliance, and none tests PBR values against ground-truth materials of a held-out asset. What exists: SF3D reports triangle counts for one mesh per method (SF3D 27.4K vs TripoSR 32.1K, OpenLRM 662K) and a box-projection UV unwrap in 0.5 s, with remesher options (triangle, quad split to triangles); TRELLIS.2 reports PSNR/LPIPS on rendered PBR maps for reconstruction, offers GLB export with remesh and a decimation target (README example 1,000,000 faces, 4096 texture), and states small holes occur; SF3D and SPAR3D state material estimation is homogeneous or sometimes suboptimal; TRELLIS (first release) states baked-in lighting and no PBR; Hunyuan 2.0 describes a low-polygon stylization module in its hosted Studio. Production claims are the vendors'.

No inspected source measures retopology quality (edge flow), UV distortion or engine polygon-budget compliance, and none tests PBR values against ground-truth materials of a held-out asset. What exists: SF3D reports triangle counts for one mesh per method (SF3D 27.4K vs TripoSR 32.1K, OpenLRM 662K) and a box-projection UV unwrap in 0.5 s, with remesher options (triangle, quad split to triangles); TRELLIS.2 reports PSNR/LPIPS on rendered PBR maps for reconstruction, offers GLB export with remesh and a decimation target (README example 1,000,000 faces, 4096 texture), and states small holes occur; SF3D and SPAR3D state material estimation is homogeneous or sometimes suboptimal; TRELLIS (first release) states baked-in lighting and no PBR; Hunyuan 2.0 describes a low-polygon stylization module in its hosted Studio. Production claims are the vendors'.

Curator correction 2026-10-23 (discovery audit record C3-B588-05; sources re-fetched 2026-10-23, excerpts re-located by curator GET): Correction (unsupported by the cited source). C3-B080-W16-07 attributes several limits to the cited READMEs: TRELLIS.2 'states small holes occur', TRELLIS first release 'states baked-in lighting and no PBR', and SF3D/SPAR3D 'state material estimation is homogeneous or sometimes suboptimal', plus SF3D triangle counts and a 0.5 s UV unwrap. In the pinned READMEs fetched 2026-10-23 none of these statements appears. The TRELLIS.2 small-holes statement is real but sits in the Hugging Face model card, under Known Limitations. The SF3D/SPAR3D and TRELLIS v1 statements and the SF3D numbers were not found at the cited sources (they may be in papers or HF cards not cited). Cite the card for the holes statement and treat the rest as unverified until a source is added. Version/date. Fetched 2026-10-23.

Curator qualifications: All excerpts located; no source measures retopology, UV distortion or PBR correctness (bounded negative).

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

```json
{
  "citations": [
    {
      "url": "https://arxiv.org/abs/2408.00653v1",
      "note": "candidate evidence excerpts"
    },
    {
      "url": "https://github.com/Stability-AI/stable-fast-3d/blob/ff21fc491b4dc5314bf6734c7c0dabd86b5f5bb2/README.md",
      "note": "candidate evidence excerpts"
    },
    {
      "url": "https://arxiv.org/abs/2501.04689v1",
      "note": "candidate evidence excerpts"
    },
    {
      "url": "https://github.com/microsoft/TRELLIS.2/blob/75fbf0183001ed9876c8dbb35de6b68552ee08bd/README.md",
      "note": "candidate evidence excerpts"
    },
    {
      "url": "https://huggingface.co/microsoft/TRELLIS.2-4B/raw/af44b45f2e35a493886929c6d786e563ec68364d/README.md",
      "note": "candidate evidence excerpts"
    },
    {
      "url": "https://arxiv.org/abs/2512.14692v1",
      "note": "candidate evidence excerpts"
    },
    {
      "url": "https://arxiv.org/abs/2412.01506v3",
      "note": "candidate evidence excerpts"
    },
    {
      "url": "https://arxiv.org/abs/2501.12202v5",
      "note": "candidate evidence excerpts"
    },
    {
      "url": "https://arxiv.org/abs/2506.15442v1",
      "note": "candidate evidence excerpts"
    },
    {
      "url": "https://arxiv.org/abs/2502.06608v3",
      "note": "candidate evidence excerpts"
    },
    {
      "url": "https://github.com/microsoft/TRELLIS/blob/442aa1e1afb9014e80681d3bf604e8d728a86ee7/README.md",
      "note": "candidate evidence excerpts"
    }
  ]
}
```

Evidence claims:
- [sourced_fact] No inspected source measures retopology quality (edge flow), UV distortion or engine polygon-budget compliance, and none tests PBR values against ground-truth materials of a held-out asset. What exists: SF3D reports triangle counts for one mesh per method (SF3D 27.4K vs TripoSR 32.1K, OpenLRM 662K) and a box-projection UV unwrap in 0.5 s, with remesher options (triangle, quad split to triangles); TRELLIS.2 reports PSNR/LPIPS on rendered PBR maps for reconstruction, offers GLB export with remesh and a decimation target (README example 1,000,000 faces, 4096 texture), and states small holes occur; SF3D and SPAR3D state material estimation is homogeneous or sometimes suboptimal; TRELLIS (first release) states baked-in lighting and no PBR; Hunyuan 2.0 describes a low-polygon stylization module in its hosted Studio. Production claims are the vendors'. · locator: candidate evidence excerpts · source: https://arxiv.org/abs/2408.00653v1

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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