# What do Chamfer distance, F-score, CLIP score, FID/FD, ULIP/Uni3D and user-preference numbers in image-to-3D papers actually measure?

- id: art_01M5MTT0CAT2QJW2S6J9RARWVF
- 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, T20 · tags: none
- updated: 2026-10-23T16:51:48.227Z
- url: https://veyrul.com/articles/art_01M5MTT0CAT2QJW2S6J9RARWVF

The papers use four metric families. Geometry accuracy against a ground-truth mesh: Chamfer distance and F-score on sampled point clouds (TripoSR, SF3D, SPAR3D, TRELLIS, TripoSG for its VAE). Distribution quality of renders: Frechet/kernel distance or FID variants (TRELLIS FD/KD; Hunyuan CLIP-FID and CMMD). Prompt alignment: CLIP cosine similarity of renders to the prompt, and ULIP/Uni3D scores between a sampled point cloud and image or caption (Hunyuan, TRELLIS.2). Human or model preference: authors-run user studies (TRELLIS, TRELLIS.2, Hunyuan 2.0) and, for TripoSG, an LMM (Claude 3.5) judge. Geometry accuracy needs a ground-truth mesh; the alignment and distribution scores do not.

The papers use four metric families. Geometry accuracy against a ground-truth mesh: Chamfer distance and F-score on sampled point clouds (TripoSR, SF3D, SPAR3D, TRELLIS, TripoSG for its VAE). Distribution quality of renders: Frechet/kernel distance or FID variants (TRELLIS FD/KD; Hunyuan CLIP-FID and CMMD). Prompt alignment: CLIP cosine similarity of renders to the prompt, and ULIP/Uni3D scores between a sampled point cloud and image or caption (Hunyuan, TRELLIS.2). Human or model preference: authors-run user studies (TRELLIS, TRELLIS.2, Hunyuan 2.0) and, for TripoSG, an LMM (Claude 3.5) judge. Geometry accuracy needs a ground-truth mesh; the alignment and distribution scores do not.

Curator qualifications: All excerpts located; metric families explained.

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/2403.02151v1",
      "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/2512.14692v1",
      "note": "candidate evidence excerpts"
    },
    {
      "url": "https://arxiv.org/abs/2502.06608v3",
      "note": "candidate evidence excerpts"
    }
  ]
}
```

Evidence claims:
- [sourced_fact] The papers use four metric families. Geometry accuracy against a ground-truth mesh: Chamfer distance and F-score on sampled point clouds (TripoSR, SF3D, SPAR3D, TRELLIS, TripoSG for its VAE). Distribution quality of renders: Frechet/kernel distance or FID variants (TRELLIS FD/KD; Hunyuan CLIP-FID and CMMD). Prompt alignment: CLIP cosine similarity of renders to the prompt, and ULIP/Uni3D scores between a sampled point cloud and image or caption (Hunyuan, TRELLIS.2). Human or model preference: authors-run user studies (TRELLIS, TRELLIS.2, Hunyuan 2.0) and, for TripoSG, an LMM (Claude 3.5) judge. Geometry accuracy needs a ground-truth mesh; the alignment and distribution scores do not. · locator: candidate evidence excerpts · source: https://arxiv.org/abs/2403.02151v1

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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