# How do papers actually check that an interactive world model did what the action or camera input asked, and what are the four basic ways of doing it?

- id: art_01M5MB4J9HRJ6J3DC531FB4M3S
- 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, T18, T20 · tags: none
- updated: 2026-10-23T12:17:57.034Z
- url: https://veyrul.com/articles/art_01M5MB4J9HRJ6J3DC531FB4M3S

The inspected primary papers use four different checks. (1) Recover the action from the generated video with an inverse-dynamics model (IDM) and compare with the input: MineWorld reports precision/recall/F1 plus an L1 camera-bin loss, Matrix-Game reports keyboard and mouse accuracy. (2) Recover the camera path from the generated frames with SfM/SLAM and compare with the requested path: CameraCtrl (RotErr, TransErr), Hunyuan-GameCraft (relative pose error) and WorldScore (camera error). (3) Compare output with real versus random latent actions: Genie's delta-t PSNR. (4) Ask humans whether the motion matches: Yume's instruction-following score and GameCraft's 30-evaluator ranking. Each check needs its own helper model or labelled test set, so a score from one paper cannot be read against another's.

The inspected primary papers use four different checks. (1) Recover the action from the generated video with an inverse-dynamics model (IDM) and compare with the input: MineWorld reports precision/recall/F1 plus an L1 camera-bin loss, Matrix-Game reports keyboard and mouse accuracy. (2) Recover the camera path from the generated frames with SfM/SLAM and compare with the requested path: CameraCtrl (RotErr, TransErr), Hunyuan-GameCraft (relative pose error) and WorldScore (camera error). (3) Compare output with real versus random latent actions: Genie's delta-t PSNR. (4) Ask humans whether the motion matches: Yume's instruction-following score and GameCraft's 30-evaluator ranking. Each check needs its own helper model or labelled test set, so a score from one paper cannot be read against another's.

Curator qualifications: Excerpted evidence located; the four check families are well supported. Two excerpt-less rows (CameraCtrl equations, Genie delta-PSNR) are consistent with C3R-0269 (Genie).

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/2504.08388v1",
      "note": "Table 1; App. Table 5"
    },
    {
      "url": "https://arxiv.org/abs/2506.18701v1",
      "note": "Table 1; App. Table 5"
    },
    {
      "url": "https://arxiv.org/abs/2404.02101v2",
      "note": "Table 1; App. Table 5"
    },
    {
      "url": "https://arxiv.org/abs/2506.17201v1",
      "note": "Table 1; App. Table 5"
    },
    {
      "url": "https://arxiv.org/abs/2504.00983v2",
      "note": "Table 1; App. Table 5"
    },
    {
      "url": "https://arxiv.org/abs/2402.15391v1",
      "note": "Table 1; App. Table 5"
    },
    {
      "url": "https://arxiv.org/abs/2507.17744v1",
      "note": "Table 1; App. Table 5"
    }
  ]
}
```

Evidence claims:
- [sourced_fact] The inspected primary papers use four different checks. (1) Recover the action from the generated video with an inverse-dynamics model (IDM) and compare with the input: MineWorld reports precision/recall/F1 plus an L1 camera-bin loss, Matrix-Game reports keyboard and mouse accuracy. (2) Recover the camera path from the generated frames with SfM/SLAM and compare with the requested path: CameraCtrl (RotErr, TransErr), Hunyuan-GameCraft (relative pose error) and WorldScore (camera error). (3) Compare output with real versus random latent actions: Genie's delta-t PSNR. (4) Ask humans whether the motion matches: Yume's instruction-following score and GameCraft's 30-evaluator ranking. Each check needs its own helper model or labelled test set, so a score from one paper cannot be read against another's. · locator: Table 1; App. Table 5 · source: https://arxiv.org/abs/2504.08388v1

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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