{
  "date": "2026-10-13",
  "model": "ideal pinhole, fixed sensor; no lens distortion/depth of field",
  "duration_seconds": 12,
  "fps": 24,
  "frames": 288,
  "audio": "none by design",
  "projection": "pixel_width=400*f*object_width/(object_z-camera_z)",
  "object_width": 1,
  "foreground_z": 4,
  "background_z": 8,
  "zoom": {
    "camera_z": 0,
    "f_start": 1,
    "f_end": 2,
    "end_foreground_px": 200,
    "end_background_px": 100
  },
  "dolly": {
    "camera_z_start": 0,
    "camera_z_end": 2,
    "f": 1,
    "end_foreground_px": 200,
    "end_background_px": 66.66666666666667
  },
  "max_foreground_width_difference_px": 2.842170943040401e-14,
  "checks": {
    "matched_foreground_every_frame": true,
    "different_background_scale": true,
    "duration_and_frame_count": true
  },
  "limits": "Geometry demonstration; does not establish emotional or teaching effectiveness."
}