{
  "schema": "vtl-sprite-fright-focused-calibration-v0.1",
  "purpose": "Estimate an observed repeat-render floor and local blocking sensitivity for public-facing channels; not a universal calibration.",
  "source_saved_or_modified": false,
  "render_context": {
    "shot": "Sprite Fright 010_0050_A",
    "frame": 256,
    "resolution": [
      960,
      402
    ],
    "engine": "Blender 4.2.23 EEVEE_NEXT",
    "samples": 32,
    "measurement_layer": "editable RGBA foreground/character layer"
  },
  "repeat_design": {
    "description": "Frames rendered independently along two routes before their parameters diverge.",
    "identical_frames": [
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      128,
      154
    ],
    "pairs": [
      {
        "frame": 103,
        "camera_only": "retained in the internal evidence archive; not included in this public package",
        "joint_route_before_intervention": "retained in the internal evidence archive; not included in this public package",
        "camera_sha256": "538cc7b230f54c02e80b1c90ba067d8dd3ed86e98e15bd5ac077c601fde0264d",
        "joint_sha256": "7b283935c87ef37e09e7d2d65f0b3d02a04462019f4fa9968303e311e767d3e0",
        "mean_abs_rgb_delta": 3.0484830659816e-8,
        "camera_metrics": {
          "delta_x": -0.175,
          "delta_y": -0.0053,
          "rho_r": 0.3865,
          "mu": 0.6139,
          "x_p": 0.1576,
          "theta": 0.0212,
          "d_s": 0.0173,
          "sdi": 0.179,
          "g1_path_length_norm": 0.079312,
          "g1_curvature_reliable": 0.334143
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        "joint_metrics": {
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          "delta_y": -0.0053,
          "rho_r": 0.3865,
          "mu": 0.6139,
          "x_p": 0.1576,
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          "sdi": 0.179,
          "g1_path_length_norm": 0.079312,
          "g1_curvature_reliable": 0.334139
        }
      },
      {
        "frame": 128,
        "camera_only": "retained in the internal evidence archive; not included in this public package",
        "joint_route_before_intervention": "retained in the internal evidence archive; not included in this public package",
        "camera_sha256": "5fe5039e0d1f88939943f5c3d4f890ff1ccb197e2becd1432ebc79de7cf49323",
        "joint_sha256": "7b01d42a8159e45e5a9a64d08a3f1fbb113e3832a8f063985b17a3525b523840",
        "mean_abs_rgb_delta": 2.032322576894785e-8,
        "camera_metrics": {
          "delta_x": -0.1651,
          "delta_y": -0.0063,
          "rho_r": 0.3775,
          "mu": 0.571,
          "x_p": 0.1024,
          "theta": 0.0195,
          "d_s": 0.0177,
          "sdi": 0.177,
          "g1_path_length_norm": 0.069178,
          "g1_curvature_reliable": 0.234598
        },
        "joint_metrics": {
          "delta_x": -0.1651,
          "delta_y": -0.0063,
          "rho_r": 0.3775,
          "mu": 0.571,
          "x_p": 0.1024,
          "theta": 0.0195,
          "d_s": 0.0177,
          "sdi": 0.177,
          "g1_path_length_norm": 0.069178,
          "g1_curvature_reliable": 0.234613
        }
      },
      {
        "frame": 154,
        "camera_only": "retained in the internal evidence archive; not included in this public package",
        "joint_route_before_intervention": "retained in the internal evidence archive; not included in this public package",
        "camera_sha256": "c31ca73d9a31f3e628bed6340c4e881e8b36c2770c9dabed8915fcbd580ca638",
        "joint_sha256": "2244cc2a67b30dee84833f8e1e1f793686549a96f4a2d60c7aff50869cb42d14",
        "mean_abs_rgb_delta": 4.0646437327040985e-8,
        "camera_metrics": {
          "delta_x": -0.1582,
          "delta_y": -0.0054,
          "rho_r": 0.3836,
          "mu": 0.5221,
          "x_p": 0.1204,
          "theta": 0.0183,
          "d_s": 0.019,
          "sdi": 0.1729,
          "g1_path_length_norm": 0.064759,
          "g1_curvature_reliable": 0.183167
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        "joint_metrics": {
          "delta_x": -0.1582,
          "delta_y": -0.0054,
          "rho_r": 0.3836,
          "mu": 0.5221,
          "x_p": 0.1204,
          "theta": 0.0183,
          "d_s": 0.019,
          "sdi": 0.1729,
          "g1_path_length_norm": 0.064759,
          "g1_curvature_reliable": 0.183202
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      }
    ],
    "observed_floor": {
      "delta_x": {
        "max_abs_difference": 0,
        "mean_abs_difference": 0
      },
      "delta_y": {
        "max_abs_difference": 0,
        "mean_abs_difference": 0
      },
      "rho_r": {
        "max_abs_difference": 0,
        "mean_abs_difference": 0
      },
      "mu": {
        "max_abs_difference": 0,
        "mean_abs_difference": 0
      },
      "x_p": {
        "max_abs_difference": 0,
        "mean_abs_difference": 0
      },
      "theta": {
        "max_abs_difference": 0,
        "mean_abs_difference": 0
      },
      "d_s": {
        "max_abs_difference": 0,
        "mean_abs_difference": 0
      },
      "sdi": {
        "max_abs_difference": 0,
        "mean_abs_difference": 0
      },
      "g1_path_length_norm": {
        "max_abs_difference": 0,
        "mean_abs_difference": 0
      },
      "g1_curvature_reliable": {
        "max_abs_difference": 0.00003500000000000725,
        "mean_abs_difference": 0.0000179999999999995
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    }
  },
  "dose_design": {
    "description": "One frame, camera and performance held, lead-rig world-X offset stepped by 0.25 m.",
    "candidates": [
      {
        "label": "reference",
        "lead_world_x_offset_m": 0,
        "image": "retained in the internal evidence archive; not included in this public package",
        "sha256": "0eb6eb386a97911d3591b034fb99d57de3a9f85153859a9785c04fadf0f5cb53",
        "metrics": {
          "delta_x": -0.0398,
          "delta_y": -0.0983,
          "rho_r": 0.4496,
          "mu": 1,
          "x_p": 0.0249,
          "theta": 0.0147,
          "d_s": 0.0141,
          "sdi": 0.155,
          "g1_path_length_norm": 0.064044,
          "g1_curvature_reliable": 0.15594
        }
      },
      {
        "label": "close_025",
        "lead_world_x_offset_m": -0.25,
        "image": "retained in the internal evidence archive; not included in this public package",
        "sha256": "40c77b1e50cca912d023554c4778db63ef72d6c2a5785c7dbc666614df6d4285",
        "metrics": {
          "delta_x": -0.0443,
          "delta_y": -0.099,
          "rho_r": 0.4618,
          "mu": 1,
          "x_p": 0.0252,
          "theta": 0.0152,
          "d_s": 0.0145,
          "sdi": 0.1521,
          "g1_path_length_norm": 0.066311,
          "g1_curvature_reliable": 0.100479
        }
      },
      {
        "label": "close_050",
        "lead_world_x_offset_m": -0.5,
        "image": "retained in the internal evidence archive; not included in this public package",
        "sha256": "57b3fdb7ea92aefa12ae31ec041da9b7cf152d7d3f24e5618a47326fa1e40e11",
        "metrics": {
          "delta_x": -0.0548,
          "delta_y": -0.1002,
          "rho_r": 0.4722,
          "mu": 1,
          "x_p": 0.0261,
          "theta": 0.0154,
          "d_s": 0.0148,
          "sdi": 0.1464,
          "g1_path_length_norm": 0.069495,
          "g1_curvature_reliable": 0.08223
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      },
      {
        "label": "close_075",
        "lead_world_x_offset_m": -0.75,
        "image": "retained in the internal evidence archive; not included in this public package",
        "sha256": "82c9b709c8852a20bae5c915d39efe312792b0277e39a8df2027e15ba98d7132",
        "metrics": {
          "delta_x": -0.0581,
          "delta_y": -0.1009,
          "rho_r": 0.4739,
          "mu": 1,
          "x_p": 0.0264,
          "theta": 0.0157,
          "d_s": 0.0148,
          "sdi": 0.1446,
          "g1_path_length_norm": 0.070939,
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    ],
    "sensitivity": {
      "delta_x": {
        "available": true,
        "values": [
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          -0.0443,
          -0.0548,
          -0.0581
        ],
        "adjacent_step_differences": [
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          -0.010500000000000002,
          -0.0032999999999999974
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        "total_span": 0.018299999999999997,
        "direction": "nonincreasing",
        "three_x_repeat_floor": 0.000001,
        "adjacent_steps_clearing_floor": [
          true,
          true,
          true
        ],
        "all_adjacent_steps_clear_floor": true
      },
      "delta_y": {
        "available": true,
        "values": [
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          -0.099,
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        "adjacent_step_differences": [
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        "adjacent_steps_clearing_floor": [
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        "all_adjacent_steps_clear_floor": true
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      "rho_r": {
        "available": true,
        "values": [
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          0.4722,
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        "adjacent_step_differences": [
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        "direction": "nondecreasing",
        "three_x_repeat_floor": 0.000001,
        "adjacent_steps_clearing_floor": [
          true,
          true,
          true
        ],
        "all_adjacent_steps_clear_floor": true
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      "mu": {
        "available": true,
        "values": [
          1,
          1,
          1,
          1
        ],
        "adjacent_step_differences": [
          0,
          0,
          0
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        "total_span": 0,
        "direction": "nondecreasing",
        "three_x_repeat_floor": 0.000001,
        "adjacent_steps_clearing_floor": [
          false,
          false,
          false
        ],
        "all_adjacent_steps_clear_floor": false
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      "x_p": {
        "available": true,
        "values": [
          0.0249,
          0.0252,
          0.0261,
          0.0264
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        "adjacent_step_differences": [
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        "total_span": 0.0015000000000000013,
        "direction": "nondecreasing",
        "three_x_repeat_floor": 0.000001,
        "adjacent_steps_clearing_floor": [
          true,
          true,
          true
        ],
        "all_adjacent_steps_clear_floor": true
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      "theta": {
        "available": true,
        "values": [
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          0.0152,
          0.0154,
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        "adjacent_step_differences": [
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        "total_span": 0.0009999999999999992,
        "direction": "nondecreasing",
        "three_x_repeat_floor": 0.000001,
        "adjacent_steps_clearing_floor": [
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          true,
          true
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        "all_adjacent_steps_clear_floor": true
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      "d_s": {
        "available": true,
        "values": [
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          0.0145,
          0.0148,
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        "adjacent_step_differences": [
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          0.0002999999999999999,
          0
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        "total_span": 0.000700000000000001,
        "direction": "nondecreasing",
        "three_x_repeat_floor": 0.000001,
        "adjacent_steps_clearing_floor": [
          true,
          true,
          false
        ],
        "all_adjacent_steps_clear_floor": false
      },
      "sdi": {
        "available": true,
        "values": [
          0.155,
          0.1521,
          0.1464,
          0.1446
        ],
        "adjacent_step_differences": [
          -0.002899999999999986,
          -0.005700000000000011,
          -0.001799999999999996
        ],
        "total_span": 0.010399999999999993,
        "direction": "nonincreasing",
        "three_x_repeat_floor": 0.000001,
        "adjacent_steps_clearing_floor": [
          true,
          true,
          true
        ],
        "all_adjacent_steps_clear_floor": true
      },
      "g1_path_length_norm": {
        "available": true,
        "values": [
          0.064044,
          0.066311,
          0.069495,
          0.070939
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        "adjacent_step_differences": [
          0.0022669999999999912,
          0.0031840000000000063,
          0.0014440000000000008
        ],
        "total_span": 0.006894999999999998,
        "direction": "nondecreasing",
        "three_x_repeat_floor": 0.000001,
        "adjacent_steps_clearing_floor": [
          true,
          true,
          true
        ],
        "all_adjacent_steps_clear_floor": true
      },
      "g1_curvature_reliable": {
        "available": true,
        "values": [
          0.15594,
          0.100479,
          0.08223,
          0.046321
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        "adjacent_step_differences": [
          -0.055460999999999996,
          -0.018249,
          -0.035908999999999996
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        "total_span": 0.109619,
        "direction": "nonincreasing",
        "three_x_repeat_floor": 0.00010500000000002174,
        "adjacent_steps_clearing_floor": [
          true,
          true,
          true
        ],
        "all_adjacent_steps_clear_floor": true
      }
    }
  },
  "limits": [
    "Three matched repeat pairs estimate an observed floor; they do not establish a population distribution.",
    "One shot and one blocking axis do not establish global behavior across scenes, renderers, resolutions, or substrates.",
    "Thresholded channels may be locally discontinuous even when the scene control changes smoothly.",
    "A channel clearing the render floor means detectable in this test, not perceptually or dramatically important."
  ],
  "implementation_sources": {
    "analysis": "retained in the internal evidence archive; not included in this public package",
    "isr": "ISR measurement implementation retained in the internal evidence archive",
    "temporal_fields": "retained in the internal evidence archive; not included in this public package"
  }
}