Add PCVE-Bench: 20 scenes, 131 physics edit tasks (benchmark data only)

README.md

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+---
+pretty_name: PCVE-Bench
+tags:
+  - video-editing
+  - physics
+  - physical-reasoning
+  - benchmark
+  - video
+task_categories:
+  - text-to-video
+  - image-to-video
+language:
+  - en
+  - zh
+size_categories:
+  - n<1K
+---
+
+# PCVE-Bench
+
+**P**hysics-**C**onsistent **V**ideo **E**diting benchmark: 20 scenes, 20 source
+videos, 131 edit tasks. Each task asks a model to re-render a source video under
+a changed physical parameter (mass, friction, restitution, initial velocity, or
+the presence of an object) and provides the physically-simulated ground truth to
+score against.
+
+Everything is rendered from a PyBullet simulation driving a Blender scene, so
+every case ships exact per-frame object trajectories alongside the video.
+
+## Download
+
+```python
+from huggingface_hub import snapshot_download
+
+root = snapshot_download(repo_id="ccmoony/PCVE-Bench", repo_type="dataset")
+```
+
+```bash
+hf download ccmoony/PCVE-Bench --repo-type dataset --local-dir PCVE-Bench
+```
+
+Physics-Consistent Video Editing benchmark. 20 scenes,
+20 source videos, 131 edit tasks.
+
+## Layout
+- `benchmark_manifest.json`: flat index of every source + edit; the
+  authoritative record. Every field the evaluator needs (prompts,
+  physics_diff, edit_summary, video/gt paths) is inlined here.
+- `scenes/{scene}/cases/{case_id}/`:
+    - `video.mp4` -- the source (in the baseline case) or edited render.
+    - `prompts.json` -- redundant with the top-level manifest; kept
+      per-case so an evaluator that iterates directories has everything
+      local.
+    - `ground_truth_transforms.json` -- per-frame world matrices,
+      linear/angular velocities and any object-specific quality metrics
+      the physics sim produced. Use these for physics-consistency
+      metrics; skip them if you are only doing pixel/perceptual eval.
+- `thumbnails/{scene}/{case_id}.jpg`: mid-frame preview per case.
+- `splits/all.txt`: every edit's `global_id`, one per line.
+- `splits/by_property/`: same, bucketed by the edited property (mass /
+  friction / restitution / initial_velocity / presence for DELETE and ADD
+  edits, which both move an object along the present/absent axis).
+- `splits/by_timing/`: same, bucketed by when the edit takes effect --
+  `whole_clip.txt` for edits that hold from the first frame, and
+  `partway.txt` for edits that land at `applies_from_frame`, where the
+  frames before it are supposed to match the source video exactly.
+
+## Prompts
+Each edit has 4 flavors under `prompts`:
+- `vague.zh` / `vague.en`: direction-only ("调大一点" / "Decrease X").
+- `quantitative.zh` / `quantitative.en`: includes `from` and `to` numbers.
+
+Every prompt opens by saying when the edit takes effect, because that is
+part of the instruction: "From frame 1 onwards" / "From the start of the
+clip" for the whole-clip edits, and "From frame 22 onwards" / "Early in
+the clip" for one that lands partway through. `applies_from_frame` in the
+manifest is the same fact in machine-readable form.
+
+## Task
+Given (`source_video`, prompt), generate a video that matches
+`edited_video`. Compare against `ground_truth_transforms.json` for
+per-frame object trajectories, or against `edited_video` for pixel /
+perceptual metrics.
+
+## Counts
+- Edits by kind: {'SET': 92, 'DELETE': 32, 'ADD': 7}
+- Edits by timing: {'partway': 14, 'whole_clip': 117}
+- Edits by property: {'friction': 21, 'initial_velocity': 26, 'mass': 32, 'presence': 39, 'restitution': 13}
+
+## Notes
+- `ground_truth_transforms.json` is the physics record, not a render log: the
+  `physics` block carries the simulator settings, per-object parameters and
+  scene geometry actually used, and `frames` carries the per-frame world
+  matrices and velocities.
+- Model predictions are **not** part of this release; the repository contains
+  only the benchmark data.

scenes/air_hockey_chain/cases/air_hockey_chain_baseline/prompts.json

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+{
+  "schema_version": 1,
+  "case_id": "air_hockey_chain_baseline",
+  "kind": "source",
+  "editable_objects": [
+    {
+      "object_id": "blue_mallet",
+      "zh": "蓝色球槌",
+      "en": "the blue mallet",
+      "properties": [
+        "friction",
+        "initial_velocity",
+        "mass",
+        "restitution"
+      ],
+      "can_delete": true
+    },
+    {
+      "object_id": "red_mallet",
+      "zh": "红色球槌",
+      "en": "the red mallet",
+      "properties": [
+        "friction",
+        "mass",
+        "restitution"
+      ],
+      "can_delete": true
+    },
+    {
+      "object_id": "white_mallet",
+      "zh": "白色球槌",
+      "en": "the white mallet",
+      "properties": [
+        "friction",
+        "mass",
+        "restitution"
+      ],
+      "can_delete": true
+    }
+  ],
+  "prompts": {
+    "vague": {
+      "zh": "蓝色球槌沿桌面被推向红色球槌,撞上后停在原地、把速度交出去;红色球槌照样把速度交给白色球槌,白色球槌再把这股推力带向近端围板。",
+      "en": "The blue mallet is pushed along the table into the red mallet, stops where it hits and hands its speed on; the red mallet passes it to the white mallet the same way, and the white one carries the push on to the near rail."
+    },
+    "quantitative": {
+      "zh": "三个相同的球槌成一列排开,间距 0.60 m。蓝色球槌以 0.8 m/s 被推向红色球槌并停住,红色球槌又撞上白色球槌后停住。三个球槌的行程都在 0.49 m 上下。",
+      "en": "Three identical mallets sit in a line 0.60 m apart. The blue mallet is pushed at 0.8 m/s into the red mallet and stops there; the red mallet goes on into the white mallet and stops in turn. All three end up having travelled about the same 0.49 m."
+    }
+  }
+}

scenes/air_hockey_chain/cases/air_hockey_chain_baseline/video.mp4

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+version https://git-lfs.github.com/spec/v1
+oid sha256:c75bc61321d8e699166582ea56b5ea189272fea46f62261e90ed350c18658efd
+size 736242

scenes/air_hockey_chain/cases/edit_add_mallet_last_gap/prompts.json

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+{
+  "schema_version": 2,
+  "case_id": "edit_add_mallet_last_gap",
+  "source_case_id": "air_hockey_chain_baseline",
+  "edit_dsl": "ADD green_mallet BETWEEN red_mallet AND white_mallet AT MIDPOINT",
+  "edit_summary": "A fourth mallet set down at the midpoint of the red-to-white line. The relay gains a stage: blue still hands off after its usual 0.48 m, but red now runs only 0.18 m before it meets green instead of 0.49 m to reach white. Green carries the push the remaining 0.43 m, and white finishes with 0.52 m of travel against the baseline's 0.49 m. Each striker still stops close to where it hits, so the extra handoff reads as a pause in the middle of the table rather than as a loss of reach.",
+  "applies_from_frame": 1,
+  "physics_diff": {
+    "green_mallet": {
+      "from": "absent",
+      "to": "present",
+      "position": {
+        "on_line_between": [
+          "red_mallet",
+          "white_mallet"
+        ],
+        "at": "midpoint",
+        "measured_from": null,
+        "fraction_from_endpoint_a": 0.5,
+        "resolved_location": [
+          0.896625,
+          0.0,
+          0.0328
+        ],
+        "endpoint_locations": [
+          [
+            1.1955,
+            0.0,
+            0.0328
+          ],
+          [
+            0.59775,
+            0.0,
+            0.0328
+          ]
+        ]
+      }
+    },
+    "timing": {
+      "applies_from_frame": 1,
+      "total_frames": 96,
+      "unedited_frames": []
+    }
+  },
+  "prompts": {
+    "vague": {
+      "zh": "从视频一开始,在红色球槌和白色球槌的连线上、大致中间的位置,放一个绿色球槌。",
+      "en": "From the start of the clip, place the green mallet on the line between the red mallet and the white mallet, about midway between them."
+    },
+    "quantitative": {
+      "zh": "从第 1 帧开始,在红色球槌和白色球槌连线的中点放一个绿色球槌。",
+      "en": "From frame 1 onwards, place the green mallet at the midpoint of the line between the red mallet and the white mallet."
+    }
+  }
+}

scenes/air_hockey_chain/cases/edit_add_mallet_last_gap/video.mp4

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+version https://git-lfs.github.com/spec/v1
+oid sha256:95e843196d46824bdb501605d161cd690f06a16c1fd8126c64b826c573a82ee5
+size 739477

scenes/air_hockey_chain/cases/edit_dead_striker_face/prompts.json

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+{
+  "schema_version": 2,
+  "case_id": "edit_dead_striker_face",
+  "source_case_id": "air_hockey_chain_baseline",
+  "edit_dsl": "SET blue_mallet.restitution TIMES 0.3",
+  "edit_summary": "Soft face on the pushed mallet only, so the first impact is a shove rather than a clean handoff. Blue no longer stops on contact: it slides on behind red for 1.16 m against the baseline's 0.48 m and is still drifting at 0.09 m/s when the clip ends. Red leaves the collision at 0.51 m/s instead of 0.75, and what reaches white is down to 0.35 m/s -- half the baseline's 0.70.",
+  "applies_from_frame": 1,
+  "physics_diff": {
+    "restitution (blue_mallet)": {
+      "from": 0.95,
+      "to": 0.285
+    },
+    "timing": {
+      "applies_from_frame": 1,
+      "total_frames": 96,
+      "unedited_frames": []
+    }
+  },
+  "prompts": {
+    "vague": {
+      "zh": "从视频一开始,把蓝色球槌的恢复系数调小一些。",
+      "en": "From the start of the clip, decrease the blue mallet's restitution."
+    },
+    "quantitative": {
+      "zh": "从第 1 帧开始,把蓝色球槌的恢复系数减少到原来的 0.3 倍。",
+      "en": "From frame 1 onwards, reduce the blue mallet's restitution to 0.3 times its original value."
+    }
+  }
+}

scenes/air_hockey_chain/cases/edit_dead_striker_face/video.mp4

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+version https://git-lfs.github.com/spec/v1
+oid sha256:95503896f49df52bfbf07bd0d7633de81e78d17406f6b3200f2371cc2ad53c01
+size 744795

scenes/air_hockey_chain/cases/edit_grippy_striker/prompts.json

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+{
+  "schema_version": 2,
+  "case_id": "edit_grippy_striker",
+  "source_case_id": "air_hockey_chain_baseline",
+  "edit_dsl": "SET blue_mallet.friction TIMES 25",
+  "edit_summary": "The pushed mallet's base made to grip instead of glide -- as if it alone had lost its air cushion. PyBullet multiplies the pair, so the effective coefficient against the table goes from 0.0036 to 0.09. Blue decelerates and stops after 36 cm, well short of red. No collision happens at all: the disc riding on almost nothing is what makes the relay possible in the first place, not a detail of it. Red and white never move, and both still glide freely.",
+  "applies_from_frame": 1,
+  "physics_diff": {
+    "friction (blue_mallet)": {
+      "from": 0.06,
+      "to": 1.5
+    },
+    "timing": {
+      "applies_from_frame": 1,
+      "total_frames": 96,
+      "unedited_frames": []
+    }
+  },
+  "prompts": {
+    "vague": {
+      "zh": "从视频一开始,把蓝色球槌的摩擦系数调大一些。",
+      "en": "From the start of the clip, increase the blue mallet's friction coefficient."
+    },
+    "quantitative": {
+      "zh": "从第 1 帧开始,把蓝色球槌的摩擦系数增加到原来的 25 倍。",
+      "en": "From frame 1 onwards, increase the blue mallet's friction coefficient to 25 times its original value."
+    }
+  }
+}

scenes/air_hockey_chain/cases/edit_grippy_striker/video.mp4

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+version https://git-lfs.github.com/spec/v1
+oid sha256:98f25db636ac99cbc5ae5839cdb3b48d1fd0d0d064695fbbbf8ef34ef42d4699
+size 732311

scenes/air_hockey_chain/cases/edit_heavy_last_mallet/prompts.json

@@ -0,0 +1,29 @@
+{
+  "schema_version": 2,
+  "case_id": "edit_heavy_last_mallet",
+  "source_case_id": "air_hockey_chain_baseline",
+  "edit_dsl": "SET white_mallet.mass TIMES 10",
+  "edit_summary": "Last mallet made 10x heavier. The first handoff is untouched -- blue still stops dead on red -- but the second one fails: red bounces back up the table off white instead of stopping, and white only creeps forward at 0.13 m/s rather than carrying the push into the near rail.",
+  "applies_from_frame": 1,
+  "physics_diff": {
+    "mass (white_mallet)": {
+      "from": 0.12,
+      "to": 1.2
+    },
+    "timing": {
+      "applies_from_frame": 1,
+      "total_frames": 96,
+      "unedited_frames": []
+    }
+  },
+  "prompts": {
+    "vague": {
+      "zh": "从视频一开始,把白色球槌的质量调大一些。",
+      "en": "From the start of the clip, increase the white mallet's mass."
+    },
+    "quantitative": {
+      "zh": "从第 1 帧开始,把白色球槌的质量增加到原来的 10 倍。",
+      "en": "From frame 1 onwards, increase the white mallet's mass to 10 times its original value."
+    }
+  }
+}

scenes/air_hockey_chain/cases/edit_heavy_last_mallet/video.mp4

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+version https://git-lfs.github.com/spec/v1
+oid sha256:9e9f8bdf9eb492caeb4129e2411e36f93dba35d76742c10f3c94d1f7c662b788
+size 742015

scenes/air_hockey_chain/cases/edit_heavy_middle_mallet/prompts.json

@@ -0,0 +1,29 @@
+{
+  "schema_version": 2,
+  "case_id": "edit_heavy_middle_mallet",
+  "source_case_id": "air_hockey_chain_baseline",
+  "edit_dsl": "SET red_mallet.mass TIMES 4",
+  "edit_summary": "Middle mallet made 4x heavier. Momentum is no longer cancelled at the first impact: blue rebounds backwards up the table instead of stopping dead on red, ending further from the camera than it started. Red leaves with 0.30 m/s instead of 0.75, and the chain still reaches white but carries only 31% of the push instead of 88%.",
+  "applies_from_frame": 1,
+  "physics_diff": {
+    "mass (red_mallet)": {
+      "from": 0.12,
+      "to": 0.48
+    },
+    "timing": {
+      "applies_from_frame": 1,
+      "total_frames": 96,
+      "unedited_frames": []
+    }
+  },
+  "prompts": {
+    "vague": {
+      "zh": "从视频一开始,把红色球槌的质量调大一些。",
+      "en": "From the start of the clip, increase the red mallet's mass."
+    },
+    "quantitative": {
+      "zh": "从第 1 帧开始,把红色球槌的质量增加到原来的 4 倍。",
+      "en": "From frame 1 onwards, increase the red mallet's mass to 4 times its original value."
+    }
+  }
+}

scenes/air_hockey_chain/cases/edit_heavy_middle_mallet/video.mp4

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+version https://git-lfs.github.com/spec/v1
+oid sha256:0721577dc920416794dc6414c688afe2267f2ca4b54d0e5291b1c7166a2fe81e
+size 743034

scenes/air_hockey_chain/cases/edit_heavy_striker/prompts.json

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+{
+  "schema_version": 2,
+  "case_id": "edit_heavy_striker",
+  "source_case_id": "air_hockey_chain_baseline",
+  "edit_dsl": "SET blue_mallet.mass TIMES 10",
+  "edit_summary": "The pushed mallet made 10x heavier. Blue keeps 80% of its speed through the impact and drives on behind red rather than stopping, and red leaves faster than blue arrived (1.37 m/s against a 0.8 m/s push). The whole chain accelerates and all three finish bunched together against the near rail instead of strung out along the table where each handoff happened.",
+  "applies_from_frame": 1,
+  "physics_diff": {
+    "mass (blue_mallet)": {
+      "from": 0.12,
+      "to": 1.2
+    },
+    "timing": {
+      "applies_from_frame": 1,
+      "total_frames": 96,
+      "unedited_frames": []
+    }
+  },
+  "prompts": {
+    "vague": {
+      "zh": "从视频一开始,把蓝色球槌的质量调大一些。",
+      "en": "From the start of the clip, increase the blue mallet's mass."
+    },
+    "quantitative": {
+      "zh": "从第 1 帧开始,把蓝色球槌的质量增加到原来的 10 倍。",
+      "en": "From frame 1 onwards, increase the blue mallet's mass to 10 times its original value."
+    }
+  }
+}

scenes/air_hockey_chain/cases/edit_heavy_striker/video.mp4

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scenes/air_hockey_chain/cases/edit_remove_last_mallet/prompts.json

@@ -0,0 +1,29 @@
+{
+  "schema_version": 2,
+  "case_id": "edit_remove_last_mallet",
+  "source_case_id": "air_hockey_chain_baseline",
+  "edit_dsl": "DELETE white_mallet",
+  "edit_summary": "Last mallet removed. The first handoff is identical to the baseline -- blue stops dead, red leaves at 0.75 m/s -- but red then runs the rest of the table unobstructed and into the near rail instead of handing over at the three-quarter point.",
+  "applies_from_frame": 1,
+  "physics_diff": {
+    "white_mallet": {
+      "from": "present",
+      "to": "removed"
+    },
+    "timing": {
+      "applies_from_frame": 1,
+      "total_frames": 96,
+      "unedited_frames": []
+    }
+  },
+  "prompts": {
+    "vague": {
+      "zh": "从视频一开始,把白色球槌从场景中删除。",
+      "en": "From the start of the clip, remove the white mallet from the scene."
+    },
+    "quantitative": {
+      "zh": "从第 1 帧开始,把白色球槌从场景中删除。",
+      "en": "From frame 1 onwards, remove the white mallet from the scene."
+    }
+  }
+}

scenes/air_hockey_chain/cases/edit_remove_last_mallet/video.mp4

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scenes/air_hockey_chain/cases/edit_remove_middle_mallet/prompts.json

@@ -0,0 +1,29 @@
+{
+  "schema_version": 2,
+  "case_id": "edit_remove_middle_mallet",
+  "source_case_id": "air_hockey_chain_baseline",
+  "edit_dsl": "DELETE red_mallet",
+  "edit_summary": "Middle mallet removed. Blue coasts through the empty middle of the table and strikes white directly, losing so little to the surface on the way that the single handoff is cleaner than either of the baseline's two: white leaves with 90% of the original push. One impact instead of two, and it happens later and nearer the camera.",
+  "applies_from_frame": 1,
+  "physics_diff": {
+    "red_mallet": {
+      "from": "present",
+      "to": "removed"
+    },
+    "timing": {
+      "applies_from_frame": 1,
+      "total_frames": 96,
+      "unedited_frames": []
+    }
+  },
+  "prompts": {
+    "vague": {
+      "zh": "从视频一开始,把红色球槌从场景中删除。",
+      "en": "From the start of the clip, remove the red mallet from the scene."
+    },
+    "quantitative": {
+      "zh": "从第 1 帧开始,把红色球槌从场景中删除。",
+      "en": "From frame 1 onwards, remove the red mallet from the scene."
+    }
+  }
+}

scenes/air_hockey_chain/cases/edit_remove_middle_mallet/video.mp4

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+version https://git-lfs.github.com/spec/v1
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scenes/air_hockey_chain/cases/edit_remove_middle_mallet_mid_slide/prompts.json

@@ -0,0 +1,32 @@
+{
+  "schema_version": 2,
+  "case_id": "edit_remove_middle_mallet_mid_slide",
+  "source_case_id": "air_hockey_chain_baseline",
+  "edit_dsl": "DELETE red_mallet AT FRAME 22",
+  "edit_summary": "Middle mallet removed at frame 22, six frames after blue hands off to it and nine before it would have reached white. Frames 1-21 are the source video frame for frame, first impact included: blue is left standing at x=1.31 having given nearly all of its speed away, red slides on and then is gone at x=1.02, and white is never touched -- it is still at its start, x=0.598, on the last frame. One handoff instead of two. The whole-clip version of the same delete (edit_remove_middle_mallet) is a different video again: with no red mallet to hit, blue never stops, coasts the length of the table and strikes white itself at frame 35.",
+  "applies_from_frame": 22,
+  "physics_diff": {
+    "red_mallet": {
+      "from": "present",
+      "to": "removed"
+    },
+    "timing": {
+      "applies_from_frame": 22,
+      "total_frames": 96,
+      "unedited_frames": [
+        1,
+        21
+      ]
+    }
+  },
+  "prompts": {
+    "vague": {
+      "zh": "在视频前段,把红色球槌从场景中删除。",
+      "en": "Early in the clip, remove the red mallet from the scene."
+    },
+    "quantitative": {
+      "zh": "从第 22 帧开始,把红色球槌从场景中删除。",
+      "en": "From frame 22 onwards, remove the red mallet from the scene."
+    }
+  }
+}

scenes/air_hockey_chain/cases/edit_remove_middle_mallet_mid_slide/video.mp4

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+size 732337

scenes/air_hockey_chain/cases/edit_soft_push/prompts.json

@@ -0,0 +1,29 @@
+{
+  "schema_version": 2,
+  "case_id": "edit_soft_push",
+  "source_case_id": "air_hockey_chain_baseline",
+  "edit_dsl": "SET blue_mallet.initial_velocity TIMES 0.4",
+  "edit_summary": "Everything correct but the push is too gentle. Blue still coasts the length of the gap and still stops dead on red -- the collision physics is untouched -- but red leaves at only 0.23 m/s, is still crawling at 0.15 m/s after 0.44 m, and never covers the 0.60 m to white. The white mallet does not move at all, so the chain dies one link early.",
+  "applies_from_frame": 1,
+  "physics_diff": {
+    "initial_velocity (blue_mallet)": {
+      "from": 0.8,
+      "to": 0.32
+    },
+    "timing": {
+      "applies_from_frame": 1,
+      "total_frames": 96,
+      "unedited_frames": []
+    }
+  },
+  "prompts": {
+    "vague": {
+      "zh": "从视频一开始,把蓝色球槌的初速度大小调小一些。",
+      "en": "From the start of the clip, decrease the blue mallet's initial speed."
+    },
+    "quantitative": {
+      "zh": "从第 1 帧开始,把蓝色球槌的初速度大小减少到原来的 0.4 倍。",
+      "en": "From frame 1 onwards, reduce the blue mallet's initial speed to 0.4 times its original value."
+    }
+  }
+}

scenes/air_hockey_chain/cases/edit_soft_push/video.mp4

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:02450a2eb41903aec89f7d12dcee5116d0ec9aed1717b2a302a5cbb0b9f7a118
+size 737336

scenes/ball_block/cases/ball_block_baseline/prompts.json

@@ -0,0 +1,40 @@
+{
+  "schema_version": 1,
+  "case_id": "ball_block_baseline",
+  "kind": "source",
+  "editable_objects": [
+    {
+      "object_id": "ball",
+      "zh": "红球",
+      "en": "the ball",
+      "properties": [
+        "friction",
+        "initial_velocity",
+        "mass",
+        "restitution"
+      ],
+      "can_delete": false
+    },
+    {
+      "object_id": "wood_block",
+      "zh": "木块",
+      "en": "the wooden block",
+      "properties": [
+        "friction",
+        "mass",
+        "restitution"
+      ],
+      "can_delete": true
+    }
+  ],
+  "prompts": {
+    "vague": {
+      "zh": "红球滚过地板撞上木块,把木块推走一段后木块停下;红球随后越过木块继续前进,片尾时仍在缓慢滚动。",
+      "en": "The ball rolls across the floor into the wooden block, shoves it along until the block stops, then carries on past it and is still rolling slowly when the clip ends."
+    },
+    "quantitative": {
+      "zh": "红球以 6 m/s 滚入,第 13 帧撞上木块,把木块推出 1.47 m 后木块停下。红球越过木块继续前进,全程 4.17 m,4 秒片尾时仍在缓慢滚动。",
+      "en": "The ball rolls in at 6 m/s, reaches the wooden block on frame 13 and shoves it 1.47 m across the floor before the block comes to rest. The ball carries on past it, covering 4.17 m in all, and is still rolling slowly when the 4 s clip ends."
+    }
+  }
+}

scenes/ball_block/cases/ball_block_baseline/video.mp4

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:8f26d8fc6c0f6b9472ec63cd39dc1ec9c1548e5548b761acdc0a8c87d9a5e727
+size 713138

scenes/ball_block/cases/edit_bouncy_block/prompts.json

@@ -0,0 +1,29 @@
+{
+  "schema_version": 2,
+  "case_id": "edit_bouncy_block",
+  "source_case_id": "ball_block_baseline",
+  "edit_dsl": "SET wood_block.restitution TIMES 1.8",
+  "edit_summary": "Block's faces made near-perfectly elastic. More of the ball's momentum goes into the block and less stays with the ball: the block leaves the impact at 3.50 m/s against the baseline's 2.83 and is driven 2.10 m instead of 1.47 m, while the ball ends 2.55 m from its start instead of 4.17 m and is almost dead at 0.09 m/s. Contact is unchanged at frame 13; only what follows it changes.",
+  "applies_from_frame": 1,
+  "physics_diff": {
+    "restitution (wood_block)": {
+      "from": 0.55,
+      "to": 0.99
+    },
+    "timing": {
+      "applies_from_frame": 1,
+      "total_frames": 96,
+      "unedited_frames": []
+    }
+  },
+  "prompts": {
+    "vague": {
+      "zh": "从视频一开始,把木块的恢复系数调大一些。",
+      "en": "From the start of the clip, increase the wooden block's restitution."
+    },
+    "quantitative": {
+      "zh": "从第 1 帧开始,把木块的恢复系数增加到原来的 1.8 倍。",
+      "en": "From frame 1 onwards, increase the wooden block's restitution to 1.8 times its original value."
+    }
+  }
+}

scenes/ball_block/cases/edit_bouncy_block/video.mp4

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:70b08d379038dc0e2907de5fe0c34dd2b6968f140de6d5ca4691f74d643ff57b
+size 701254

scenes/ball_block/cases/edit_grippy_block/prompts.json

@@ -0,0 +1,29 @@
+{
+  "schema_version": 2,
+  "case_id": "edit_grippy_block",
+  "source_case_id": "ball_block_baseline",
+  "edit_dsl": "SET wood_block.friction TIMES 5",
+  "edit_summary": "Block's friction against the floor raised, as if it had a rubber underside. It is struck just as hard -- it still leaves the collision at 2.45 m/s against the baseline's 2.83 -- but grinds to a halt after 0.29 m instead of coasting 1.47 m. The impact frame is unchanged at 13.",
+  "applies_from_frame": 1,
+  "physics_diff": {
+    "friction (wood_block)": {
+      "from": 0.32,
+      "to": 1.6
+    },
+    "timing": {
+      "applies_from_frame": 1,
+      "total_frames": 96,
+      "unedited_frames": []
+    }
+  },
+  "prompts": {
+    "vague": {
+      "zh": "从视频一开始,把木块的摩擦系数调大一些。",
+      "en": "From the start of the clip, increase the wooden block's friction coefficient."
+    },
+    "quantitative": {
+      "zh": "从第 1 帧开始,把木块的摩擦系数增加到原来的 5 倍。",
+      "en": "From frame 1 onwards, increase the wooden block's friction coefficient to 5 times its original value."
+    }
+  }
+}

scenes/ball_block/cases/edit_grippy_block/video.mp4

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:1121eadc1c213fbb64548662f5cbc709882d17f30197fe22ac453a12ec8bf6ce
+size 686769

scenes/ball_block/cases/edit_heavy_ball/prompts.json

@@ -0,0 +1,29 @@
+{
+  "schema_version": 2,
+  "case_id": "edit_heavy_ball",
+  "source_case_id": "ball_block_baseline",
+  "edit_dsl": "SET ball.mass TIMES 10",
+  "edit_summary": "Ball made 10x heavier. It plows through the impact barely slowed (3.35 m/s out of 4.38 m/s in, against 0.65 m/s in the source) and launches the block at 5.37 m/s, driving it 4.73 m instead of 1.47 m -- the block leaves frame rather than sliding to a stop. Both it and the ball are still travelling when the clip ends.",
+  "applies_from_frame": 1,
+  "physics_diff": {
+    "mass (ball)": {
+      "from": 0.58,
+      "to": 5.8
+    },
+    "timing": {
+      "applies_from_frame": 1,
+      "total_frames": 96,
+      "unedited_frames": []
+    }
+  },
+  "prompts": {
+    "vague": {
+      "zh": "从视频一开始,把红球的质量调大一些。",
+      "en": "From the start of the clip, increase the ball's mass."
+    },
+    "quantitative": {
+      "zh": "从第 1 帧开始,把红球的质量增加到原来的 10 倍。",
+      "en": "From frame 1 onwards, increase the ball's mass to 10 times its original value."
+    }
+  }
+}

scenes/ball_block/cases/edit_heavy_ball/video.mp4

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:8fd836de076b82afade0c413e7bc75538efb9a6b629cc900d0c2c6ec8b289988
+size 679505

scenes/ball_block/cases/edit_heavy_block/prompts.json

@@ -0,0 +1,29 @@
+{
+  "schema_version": 2,
+  "case_id": "edit_heavy_block",
+  "source_case_id": "ball_block_baseline",
+  "edit_dsl": "SET wood_block.mass TIMES 10",
+  "edit_summary": "Block made 10x heavier. It barely moves -- 6 cm instead of 1.47 m -- and the ball rebounds off it back the way it came instead of following it across the floor. The contact happens at the same moment and the same place as in the source.",
+  "applies_from_frame": 1,
+  "physics_diff": {
+    "mass (wood_block)": {
+      "from": 0.65,
+      "to": 6.5
+    },
+    "timing": {
+      "applies_from_frame": 1,
+      "total_frames": 96,
+      "unedited_frames": []
+    }
+  },
+  "prompts": {
+    "vague": {
+      "zh": "从视频一开始,把木块的质量调大一些。",
+      "en": "From the start of the clip, increase the wooden block's mass."
+    },
+    "quantitative": {
+      "zh": "从第 1 帧开始,把木块的质量增加到原来的 10 倍。",
+      "en": "From frame 1 onwards, increase the wooden block's mass to 10 times its original value."
+    }
+  }
+}

scenes/ball_block/cases/edit_heavy_block/video.mp4

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:1f42ccaf50d1a83166f7869b971e2da75f376560c5a75058ae69f972b12140bf
+size 690922