Init: README + croissant.json (full 404-case)

README.md

@@ -0,0 +1,53 @@
+---
+license: cc-by-sa-4.0
+---
+
+# Apple-Pi
+
+Full Apple-Pi benchmark: **247 simulation cases + 157 realworld cases (404 total)** for evaluating physics reasoning in image and video generation models.
+
+## Folder structure
+
+```
+apple-pi/
+├── README.md
+├── croissant.json
+├── selected_cases.json
+├── sim_subset/        # 50 simulation cases
+└── realworld_subset/  # 50 realworld cases
+```
+
+## Per-case contents
+
+**Simulation** (`sim_subset/<task>/<case_id>/`) — generated with **NVIDIA Isaac Sim** (rigid-body PhysX simulator):
+- `annotation.txt`, `physics_duration.txt`, `formula_info.json`
+- `initial_state/` (rgb_0000 + white-bg variants + instance segmentation + camera params)
+- `instantaneous_velocity/` (target-time velocity reference)
+- `rgb/0000.png ~ 00NN.png` (rendered video frames @ 24 fps)
+- `instance_segmentation/`, `mask/`, `velocity/`, `depth/`, `density/`, `camera_parameters/`
+
+**Realworld** (`realworld_subset/<category>/[<subcategory>/]<case_id>/`):
+- `annotation.txt`, `formula_info.json`, `physics_duration.txt`, `annotation_config.json`
+- `initial_state/` (first-frame extraction + variants)
+- `instance_segmentation/`, `mask/`, `instantaneous_velocity/`
+- `rgb/video.mp4`
+
+## Tasks
+
+**Simulation (9 tasks)**: at_rest, circular, freefall, inclined_plane, inelastic_collision, perfectly_elastic_collision, perfectly_inelastic_collision, projectile, uniform_linear.
+
+**Realworld (7 categories)**: NewtonsFirstLaw/AtRest, Gravity/{Freefall, Projectile}, ConservationofMomentum/{InelasticCollision, PerfectlyElasticCollision, PerfectlyInelasticCollision}, Composition.
+
+## Intended use
+
+Zero-shot evaluation of physics reasoning in image- and video-generation models (perception, comprehension, generation tracks). Not intended for training.
+
+## License
+
+CC BY-SA 4.0
+
+## Citation
+
+```
+[Anonymous] Apple-Pi: Physics Infographics Benchmark. 2026.
+```

croissant.json

@@ -0,0 +1,219 @@
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+  "version": "1.0.0",
+  "datePublished": "2026-05-06",
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+  "creator": {
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+  "rai:dataBiases": "Task distribution is weighted toward common phenomena (projectile, freefall) and may under-represent rarer tasks (composition, multi-body collision). Synthetic cases use a fixed object/material library; realworld cases are recorded under controlled lighting. No demographic bias because no humans are present.",
+  "rai:personalSensitiveInformation": "None. Synthetic cases contain no people; realworld videos do not show identifiable individuals.",
+  "rai:dataUseCases": "Evaluating physics reasoning in image- and video-generation models across perception, comprehension, and generation tracks. Validated for zero-shot benchmark evaluation. Not validated for training, clinical decision-making, or robotic control.",
+  "rai:dataSocialImpact": "Positive: provides a controlled benchmark to measure physics understanding gaps in current generation models. Risk: scores may be over-interpreted as general physics reasoning ability. Mitigation: released under CC BY-SA 4.0 with explicit research-evaluation framing; contains no humans or sensitive content.",
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