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[obvious-fleet] Backend: deterministic app-shaped synthetic capture generator #299

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f1e8a20
feat(backend): deterministic app-shaped synthetic capture generator
ObviousApp Oct 16, 2026
ffeb934
docs(backend): synthetic capture validator reports and ground truth
ObviousApp Oct 16, 2026
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113 changes: 113 additions & 0 deletions backend/docs/app-capture-synth-evidence/clear-wall-ground-truth.json
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{
"scene": "clear-wall",
"seed": 1401,
"generator": "backend/scripts/gen_app_capture.py",
"world": "packet.json conventions: ARKit .gravity, y up, origin at the device position at session start",
"units": {
"length": "meters",
"angle": "degrees"
},
"wall": {
"plane": {
"point": [
0.0,
0.0,
-2.0
],
"normal": [
0.0,
0.0,
1.0
]
},
"xRange": [
-1.0,
5.0
],
"bottomY": -1.45,
"height": 2.8
},
"meter": {
"kind": "electric",
"centre": [
2.0,
-0.25,
-1.91
],
"size": [
0.45,
0.65,
0.18
],
"frontFaceZ": -1.82,
"aabb": {
"lo": [
1.775,
-0.575,
-2.0
],
"hi": [
2.225,
0.07500000000000001,
-1.82
]
}
},
"hazards": [],
"clearances": {
"note": "horizontal distances on the wall plane, metres; no rule values live here"
},
"windows": [
{
"centre": [
3.6,
0.25
],
"size": [
1.2,
1.4
],
"sillY": -0.45
}
],
"vents": [
{
"centre": [
0.4,
1.0
],
"size": [
0.3,
0.15
]
}
],
"capture": {
"keyframes": 30,
"keyframeResolution": [
640,
480
],
"depthResolution": [
256,
192
],
"walkDistanceToWallM": [
1.5,
2.5
],
"tap": {
"keyframe": "k00012",
"pixel": [
320.0,
218.728
],
"hitPosition": [
2.0,
-0.250001,
-1.82
],
"hitDistanceM": 1.5266
}
}
}
2 changes: 2 additions & 0 deletions backend/docs/app-capture-synth-evidence/clear-wall-validator-output.txt
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{"level":"warning","event":"packet_issue","msg":"synthetic_source","code":"synthetic_source","pointer":"/source/kind","capture_id":"609e3067892652719af2ae64cd3a7c09"}
{"format": "hss-validation-report/v0", "packetId": "609e3067892652719af2ae64cd3a7c09", "formatVersion": "0.4", "tier": "arkit_lidar", "stage": "full", "ok": true, "errors": [], "warnings": [{"code": "synthetic_source", "level": "warning", "pointer": "/source/kind", "message": "synthetic packet", "value": null}], "keyframes": 30, "stills": 2, "taps": 1, "epochs": 1, "files": 127, "filesHashed": 127, "maxTapReplayError": 3.4585401209596967e-10, "imagesUsable": true, "imagesDecodable": 32, "timingsS": {"schema": 0.001902872999835381, "files": 0.19820175800032303, "total": 0.2217083570003524}}
141 changes: 141 additions & 0 deletions backend/docs/app-capture-synth-evidence/gas-left-ground-truth.json
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Original file line number Diff line number Diff line change
@@ -0,0 +1,141 @@
{
"scene": "gas-left",
"seed": 1402,
"generator": "backend/scripts/gen_app_capture.py",
"world": "packet.json conventions: ARKit .gravity, y up, origin at the device position at session start",
"units": {
"length": "meters",
"angle": "degrees"
},
"wall": {
"plane": {
"point": [
0.0,
0.0,
-2.0
],
"normal": [
0.0,
0.0,
1.0
]
},
"xRange": [
-1.0,
5.0
],
"bottomY": -1.45,
"height": 2.8
},
"meter": {
"kind": "electric",
"centre": [
2.0,
-0.25,
-1.91
],
"size": [
0.45,
0.65,
0.18
],
"frontFaceZ": -1.82,
"aabb": {
"lo": [
1.775,
-0.575,
-2.0
],
"hi": [
2.225,
0.07500000000000001,
-1.82
]
}
},
"hazards": [
{
"kind": "gas_meter",
"centre": [
1.4,
-0.25,
-1.925
],
"size": [
0.35,
0.5,
0.15
],
"aabb": {
"lo": [
1.2249999999999999,
-0.5,
-2.0
],
"hi": [
1.575,
0.0,
-1.85
]
}
}
],
"clearances": {
"note": "horizontal distances on the wall plane, metres; no rule values live here",
"meterCentreToGasCentreM": 0.6,
"meterEdgeToGasEdgeM": 0.2
},
"windows": [
{
"centre": [
3.6,
0.25
],
"size": [
1.2,
1.4
],
"sillY": -0.45
}
],
"vents": [
{
"centre": [
0.4,
1.0
],
"size": [
0.3,
0.15
]
}
],
"capture": {
"keyframes": 30,
"keyframeResolution": [
640,
480
],
"depthResolution": [
256,
192
],
"walkDistanceToWallM": [
1.5,
2.5
],
"tap": {
"keyframe": "k00012",
"pixel": [
320.0,
218.728
],
"hitPosition": [
2.0,
-0.250001,
-1.82
],
"hitDistanceM": 1.5266
}
}
}
2 changes: 2 additions & 0 deletions backend/docs/app-capture-synth-evidence/gas-left-validator-output.txt
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{"level":"warning","event":"packet_issue","msg":"synthetic_source","code":"synthetic_source","pointer":"/source/kind","capture_id":"1115853d975a5129a2202ee27d758b1d"}
{"format": "hss-validation-report/v0", "packetId": "1115853d975a5129a2202ee27d758b1d", "formatVersion": "0.4", "tier": "arkit_lidar", "stage": "full", "ok": true, "errors": [], "warnings": [{"code": "synthetic_source", "level": "warning", "pointer": "/source/kind", "message": "synthetic packet", "value": null}], "keyframes": 30, "stills": 2, "taps": 1, "epochs": 1, "files": 127, "filesHashed": 127, "maxTapReplayError": 3.4585401209596967e-10, "imagesUsable": true, "imagesDecodable": 32, "timingsS": {"schema": 0.0017585860000508546, "files": 0.21119022099992435, "total": 0.22321545000022525}}
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