{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "urn:animsmith:schema:measurements:18",
  "title": "animsmith measurements v18",
  "description": "Animation measurements including artifact-derived per-bone TRS channel coverage, sampled normalized-model-space Root/Hips trajectory evidence, loop endpoint and declared frame-grid evidence, explicit per-bone loop-continuity availability, per-primitive finite geometry summaries, bounded unsupported-image magic evidence, plus static scene-bound, source material-resource, and source skeleton/rest-pose transform-domain measurements shared by measure and lint output. Every clip fact that is not applicable to every clip carries a sibling `_availability` status distinguishing `not_applicable` (this clip has no subject for the fact) from `unavailable` (the subject applies, but derivation failed); the value field is present exactly when that status is `measured`.",
  "type": "object",
  "required": [
    "schema_version",
    "schema",
    "clips",
    "material_resource_coverage",
    "material_definitions",
    "textures",
    "images",
    "mesh_definitions",
    "node_instances",
    "scenes",
    "skeleton_source_coverage",
    "skeleton_nodes",
    "skins"
  ],
  "properties": {
    "schema_version": {
      "const": 18
    },
    "schema": {
      "const": "urn:animsmith:schema:measurements:18"
    },
    "clips": {
      "type": "object",
      "additionalProperties": {
        "$ref": "#/$defs/clip_measurements"
      }
    },
    "material_resource_coverage": {
      "enum": [
        "complete",
        "unavailable"
      ]
    },
    "material_definitions": {
      "type": "array",
      "items": {
        "$ref": "#/$defs/material_definition"
      }
    },
    "textures": {
      "type": "array",
      "items": {
        "$ref": "#/$defs/texture"
      }
    },
    "images": {
      "type": "array",
      "items": {
        "$ref": "#/$defs/image"
      }
    },
    "mesh_definitions": {
      "type": "array",
      "items": {
        "$ref": "#/$defs/mesh_definition"
      }
    },
    "node_instances": {
      "type": "array",
      "items": {
        "$ref": "#/$defs/node_instance"
      }
    },
    "scenes": {
      "type": "array",
      "items": {
        "$ref": "#/$defs/scene"
      }
    },
    "default_scene_index": {
      "type": "integer",
      "minimum": 0
    },
    "skeleton_source_coverage": {
      "enum": [
        "complete",
        "unavailable"
      ]
    },
    "skeleton_nodes": {
      "type": "array",
      "items": {
        "$ref": "#/$defs/skeleton_node"
      }
    },
    "skins": {
      "type": "array",
      "items": {
        "$ref": "#/$defs/skin"
      }
    }
  },
  "allOf": [
    {
      "if": {
        "properties": {
          "material_resource_coverage": {
            "const": "unavailable"
          }
        },
        "required": [
          "material_resource_coverage"
        ]
      },
      "then": {
        "properties": {
          "material_definitions": {
            "maxItems": 0
          },
          "textures": {
            "maxItems": 0
          },
          "images": {
            "maxItems": 0
          }
        }
      }
    },
    {
      "if": {
        "properties": {
          "skeleton_source_coverage": {
            "const": "unavailable"
          }
        },
        "required": [
          "skeleton_source_coverage"
        ]
      },
      "then": {
        "properties": {
          "skeleton_nodes": {
            "maxItems": 0
          },
          "skins": {
            "maxItems": 0
          }
        }
      }
    }
  ],
  "$defs": {
    "measurement_availability": {
      "enum": [
        "measured",
        "not_applicable",
        "unavailable"
      ]
    },
    "clip_measurements": {
      "type": "object",
      "required": [
        "duration_s",
        "frame_count",
        "animated_bones",
        "bone_channels",
        "bone_rotation_range_deg",
        "loop_continuity_availability",
        "loop_endpoint_mode_availability",
        "frame_grid_availability",
        "loop_seam_ratio_availability",
        "gait_availability",
        "root_trajectory_availability",
        "speed_mps_availability"
      ],
      "properties": {
        "duration_s": {
          "type": "number"
        },
        "frame_count": {
          "type": "integer",
          "minimum": 0
        },
        "animated_bones": {
          "type": "array",
          "uniqueItems": true,
          "items": {
            "type": "string"
          }
        },
        "bone_channels": {
          "type": "array",
          "uniqueItems": true,
          "description": "Canonical set of non-empty local TRS channels present in the measured document, grouped by skeleton bone index. This describes artifact coverage, not requested transforms, removed-track evidence, or track multiplicity.",
          "items": {
            "$ref": "#/$defs/bone_channels"
          }
        },
        "bone_rotation_range_deg": {
          "type": "object",
          "description": "Maximum rotation deviation for structurally valid keyed rotation channels above the recording floor. Every key is also present in animated_bones; that cross-field invariant is enforced by the core contract validator.",
          "additionalProperties": {
            "type": "number"
          }
        },
        "loop_continuity": {
          "$ref": "#/$defs/loop_continuity"
        },
        "loop_continuity_availability": {
          "$ref": "#/$defs/measurement_availability"
        },
        "loop_endpoint_mode": {
          "enum": [
            "unique_cycle",
            "duplicate_endpoint",
            "non_closing"
          ]
        },
        "loop_endpoint_mode_availability": {
          "$ref": "#/$defs/measurement_availability"
        },
        "frame_grid": {
          "$ref": "#/$defs/frame_grid"
        },
        "frame_grid_availability": {
          "$ref": "#/$defs/measurement_availability"
        },
        "loop_seam_ratio": {
          "type": "number"
        },
        "loop_seam_ratio_availability": {
          "$ref": "#/$defs/measurement_availability"
        },
        "gait": {
          "$ref": "#/$defs/gait"
        },
        "gait_availability": {
          "$ref": "#/$defs/measurement_availability"
        },
        "root_trajectory": {
          "$ref": "#/$defs/root_trajectory"
        },
        "root_trajectory_availability": {
          "$ref": "#/$defs/measurement_availability"
        },
        "speed_mps": {
          "type": "number"
        },
        "speed_mps_availability": {
          "$ref": "#/$defs/measurement_availability"
        }
      },
      "allOf": [
        {
          "if": {
            "properties": {
              "loop_continuity_availability": {
                "const": "measured"
              }
            },
            "required": [
              "loop_continuity_availability"
            ]
          },
          "then": {
            "required": [
              "loop_continuity"
            ]
          },
          "else": {
            "not": {
              "required": [
                "loop_continuity"
              ]
            }
          }
        },
        {
          "if": {
            "properties": {
              "loop_endpoint_mode_availability": {
                "const": "measured"
              }
            },
            "required": [
              "loop_endpoint_mode_availability"
            ]
          },
          "then": {
            "required": [
              "loop_endpoint_mode"
            ]
          },
          "else": {
            "not": {
              "required": [
                "loop_endpoint_mode"
              ]
            }
          }
        },
        {
          "if": {
            "properties": {
              "frame_grid_availability": {
                "const": "measured"
              }
            },
            "required": [
              "frame_grid_availability"
            ]
          },
          "then": {
            "required": [
              "frame_grid"
            ]
          },
          "else": {
            "not": {
              "required": [
                "frame_grid"
              ]
            }
          }
        },
        {
          "if": {
            "properties": {
              "loop_seam_ratio_availability": {
                "const": "measured"
              }
            },
            "required": [
              "loop_seam_ratio_availability"
            ]
          },
          "then": {
            "required": [
              "loop_seam_ratio"
            ]
          },
          "else": {
            "not": {
              "required": [
                "loop_seam_ratio"
              ]
            }
          }
        },
        {
          "if": {
            "properties": {
              "gait_availability": {
                "const": "measured"
              }
            },
            "required": [
              "gait_availability"
            ]
          },
          "then": {
            "required": [
              "gait"
            ]
          },
          "else": {
            "not": {
              "required": [
                "gait"
              ]
            }
          }
        },
        {
          "if": {
            "properties": {
              "root_trajectory_availability": {
                "const": "measured"
              }
            },
            "required": [
              "root_trajectory_availability"
            ]
          },
          "then": {
            "required": [
              "root_trajectory"
            ]
          },
          "else": {
            "not": {
              "required": [
                "root_trajectory"
              ]
            }
          }
        },
        {
          "if": {
            "properties": {
              "speed_mps_availability": {
                "const": "measured"
              }
            },
            "required": [
              "speed_mps_availability"
            ]
          },
          "then": {
            "required": [
              "speed_mps"
            ]
          },
          "else": {
            "not": {
              "required": [
                "speed_mps"
              ]
            }
          }
        }
      ],
      "additionalProperties": false
    },
    "bone_channels": {
      "type": "object",
      "required": [
        "bone_index",
        "bone_name",
        "properties"
      ],
      "properties": {
        "bone_index": {
          "type": "integer",
          "minimum": 0
        },
        "bone_name": {
          "type": "string"
        },
        "properties": {
          "description": "Non-empty canonical subset in translation, rotation, scale order.",
          "enum": [
            [
              "translation"
            ],
            [
              "rotation"
            ],
            [
              "scale"
            ],
            [
              "translation",
              "rotation"
            ],
            [
              "translation",
              "scale"
            ],
            [
              "rotation",
              "scale"
            ],
            [
              "translation",
              "rotation",
              "scale"
            ]
          ]
        }
      },
      "additionalProperties": false
    },
    "gait": {
      "type": "object",
      "required": [
        "lr_amplitude_m",
        "phase_availability"
      ],
      "properties": {
        "phase": {
          "type": "number"
        },
        "phase_availability": {
          "$ref": "#/$defs/measurement_availability"
        },
        "lr_amplitude_m": {
          "type": "number"
        }
      },
      "allOf": [
        {
          "if": {
            "properties": {
              "phase_availability": {
                "const": "measured"
              }
            },
            "required": [
              "phase_availability"
            ]
          },
          "then": {
            "required": [
              "phase"
            ]
          },
          "else": {
            "not": {
              "required": [
                "phase"
              ]
            }
          }
        }
      ],
      "additionalProperties": false
    },
    "root_trajectory": {
      "type": "object",
      "required": [
        "bone_index",
        "bone_name",
        "source_role",
        "translation_availability",
        "yaw_availability"
      ],
      "properties": {
        "bone_index": {
          "type": "integer",
          "minimum": 0
        },
        "bone_name": {
          "type": "string"
        },
        "source_role": {
          "enum": [
            "root",
            "hips_fallback"
          ]
        },
        "translation": {
          "$ref": "#/$defs/root_translation"
        },
        "translation_availability": {
          "enum": [
            "measured",
            "unavailable"
          ]
        },
        "yaw": {
          "$ref": "#/$defs/root_yaw"
        },
        "yaw_availability": {
          "enum": [
            "measured",
            "unavailable"
          ]
        }
      },
      "allOf": [
        {
          "if": {
            "properties": {
              "translation_availability": {
                "const": "measured"
              }
            },
            "required": [
              "translation_availability"
            ]
          },
          "then": {
            "required": [
              "translation"
            ]
          },
          "else": {
            "not": {
              "required": [
                "translation"
              ]
            }
          }
        },
        {
          "if": {
            "properties": {
              "yaw_availability": {
                "const": "measured"
              }
            },
            "required": [
              "yaw_availability"
            ]
          },
          "then": {
            "required": [
              "yaw"
            ]
          },
          "else": {
            "not": {
              "required": [
                "yaw"
              ]
            }
          }
        }
      ],
      "additionalProperties": false
    },
    "root_translation": {
      "type": "object",
      "required": [
        "horizontal_displacement_x_m",
        "horizontal_displacement_z_m",
        "horizontal_travel_m",
        "vertical_displacement_m",
        "vertical_min_displacement_m",
        "vertical_max_displacement_m"
      ],
      "properties": {
        "horizontal_displacement_x_m": {
          "type": "number"
        },
        "horizontal_displacement_z_m": {
          "type": "number"
        },
        "horizontal_travel_m": {
          "type": "number",
          "minimum": 0
        },
        "vertical_displacement_m": {
          "type": "number"
        },
        "vertical_min_displacement_m": {
          "type": "number",
          "maximum": 0
        },
        "vertical_max_displacement_m": {
          "type": "number",
          "minimum": 0
        }
      },
      "additionalProperties": false
    },
    "root_yaw": {
      "type": "object",
      "required": [
        "heading_axis",
        "net_yaw_deg",
        "unwrapped_yaw_deg",
        "yaw_travel_deg"
      ],
      "properties": {
        "heading_axis": {
          "enum": [
            "positive_z",
            "positive_y",
            "positive_x"
          ]
        },
        "net_yaw_deg": {
          "type": "number",
          "minimum": -180,
          "maximum": 180
        },
        "unwrapped_yaw_deg": {
          "type": "number"
        },
        "yaw_travel_deg": {
          "type": "number",
          "minimum": 0
        }
      },
      "additionalProperties": false
    },
    "frame_grid": {
      "type": "object",
      "required": [
        "fps",
        "frame_intervals"
      ],
      "properties": {
        "fps": {
          "type": "number",
          "exclusiveMinimum": 0
        },
        "frame_intervals": {
          "type": "integer",
          "minimum": 1
        }
      },
      "additionalProperties": false
    },
    "loop_continuity": {
      "type": "object",
      "required": [
        "bones"
      ],
      "properties": {
        "bones": {
          "type": "array",
          "minItems": 1,
          "items": {
            "$ref": "#/$defs/bone_loop_continuity"
          }
        }
      },
      "additionalProperties": false
    },
    "bone_loop_continuity": {
      "type": "object",
      "required": [
        "bone_index",
        "bone_name",
        "availability"
      ],
      "properties": {
        "bone_index": {
          "type": "integer",
          "minimum": 0
        },
        "bone_name": {
          "type": "string"
        },
        "availability": {
          "enum": [
            "measured",
            "unavailable"
          ]
        },
        "position_delta_m": {
          "type": "number",
          "minimum": 0
        },
        "rotation_delta_deg": {
          "type": "number",
          "minimum": 0
        },
        "seam_velocity_delta_mps": {
          "type": "number",
          "minimum": 0
        },
        "seam_angular_velocity_delta_degps": {
          "type": "number",
          "minimum": 0
        }
      },
      "allOf": [
        {
          "if": {
            "properties": {
              "availability": {
                "const": "measured"
              }
            },
            "required": [
              "availability"
            ]
          },
          "then": {
            "required": [
              "position_delta_m",
              "rotation_delta_deg",
              "seam_velocity_delta_mps",
              "seam_angular_velocity_delta_degps"
            ]
          },
          "else": {
            "not": {
              "anyOf": [
                {
                  "required": [
                    "position_delta_m"
                  ]
                },
                {
                  "required": [
                    "rotation_delta_deg"
                  ]
                },
                {
                  "required": [
                    "seam_velocity_delta_mps"
                  ]
                },
                {
                  "required": [
                    "seam_angular_velocity_delta_degps"
                  ]
                }
              ]
            }
          }
        }
      ],
      "additionalProperties": false
    },
    "mesh_definition": {
      "type": "object",
      "required": [
        "mesh_index",
        "name",
        "primitives",
        "vertex_count",
        "max_joints_per_vertex",
        "additional_influence_sets"
      ],
      "properties": {
        "mesh_index": {
          "type": "integer",
          "minimum": 0
        },
        "name": {
          "type": "string"
        },
        "primitives": {
          "type": "array",
          "items": {
            "$ref": "#/$defs/primitive_measurements"
          }
        },
        "vertex_count": {
          "type": "integer",
          "minimum": 0
        },
        "geometry_aabb": {
          "$ref": "#/$defs/aabb"
        },
        "geometry_centroid": {
          "$ref": "#/$defs/vec3"
        },
        "max_joints_per_vertex": {
          "type": "integer",
          "minimum": 0
        },
        "weight_sum_min": {
          "type": "number"
        },
        "weight_sum_max": {
          "type": "number"
        },
        "additional_influence_sets": {
          "type": "array",
          "items": {
            "$ref": "#/$defs/additional_influence_set"
          }
        }
      },
      "additionalProperties": false
    },
    "primitive_measurements": {
      "type": "object",
      "required": [
        "primitive_index",
        "material_index",
        "vertex_count",
        "finite_vertex_count"
      ],
      "properties": {
        "primitive_index": {
          "type": "integer",
          "minimum": 0
        },
        "material_index": {
          "type": [
            "integer",
            "null"
          ],
          "minimum": 0
        },
        "vertex_count": {
          "type": "integer",
          "minimum": 0
        },
        "finite_vertex_count": {
          "type": "integer",
          "minimum": 0
        },
        "geometry_aabb": {
          "$ref": "#/$defs/aabb"
        },
        "geometry_centroid": {
          "$ref": "#/$defs/vec3"
        }
      },
      "oneOf": [
        {
          "properties": {
            "finite_vertex_count": {
              "const": 0
            }
          },
          "not": {
            "anyOf": [
              {
                "required": [
                  "geometry_aabb"
                ]
              },
              {
                "required": [
                  "geometry_centroid"
                ]
              }
            ]
          }
        },
        {
          "properties": {
            "finite_vertex_count": {
              "minimum": 1
            }
          },
          "required": [
            "geometry_aabb",
            "geometry_centroid"
          ]
        }
      ],
      "additionalProperties": false
    },
    "additional_influence_set": {
      "type": "object",
      "required": [
        "set_index",
        "joints_present",
        "weights_present",
        "joints_without_weights_present",
        "weights_without_joints_present"
      ],
      "properties": {
        "set_index": {
          "type": "integer",
          "minimum": 1
        },
        "joints_present": {
          "type": "boolean"
        },
        "weights_present": {
          "type": "boolean"
        },
        "joints_without_weights_present": {
          "type": "boolean"
        },
        "weights_without_joints_present": {
          "type": "boolean"
        }
      },
      "anyOf": [
        {
          "properties": {
            "joints_present": {
              "const": true
            }
          }
        },
        {
          "properties": {
            "weights_present": {
              "const": true
            }
          }
        }
      ],
      "allOf": [
        {
          "if": {
            "properties": {
              "joints_without_weights_present": {
                "const": true
              }
            }
          },
          "then": {
            "properties": {
              "joints_present": {
                "const": true
              }
            }
          }
        },
        {
          "if": {
            "properties": {
              "weights_without_joints_present": {
                "const": true
              }
            }
          },
          "then": {
            "properties": {
              "weights_present": {
                "const": true
              }
            }
          }
        },
        {
          "if": {
            "properties": {
              "joints_present": {
                "const": true
              },
              "weights_present": {
                "const": false
              }
            }
          },
          "then": {
            "properties": {
              "joints_without_weights_present": {
                "const": true
              }
            }
          }
        },
        {
          "if": {
            "properties": {
              "weights_present": {
                "const": true
              },
              "joints_present": {
                "const": false
              }
            }
          },
          "then": {
            "properties": {
              "weights_without_joints_present": {
                "const": true
              }
            }
          }
        }
      ],
      "additionalProperties": false
    },
    "node_instance": {
      "type": "object",
      "required": [
        "node_index",
        "node_name",
        "mesh_index"
      ],
      "properties": {
        "node_index": {
          "type": "integer",
          "minimum": 0
        },
        "node_name": {
          "type": "string"
        },
        "mesh_index": {
          "type": "integer",
          "minimum": 0
        },
        "static_node_world_aabb": {
          "$ref": "#/$defs/aabb"
        },
        "static_node_world_aabb_unavailable_reason": {
          "enum": [
            "no_finite_positions",
            "skinned_deformation_excluded",
            "non_finite_transform"
          ]
        }
      },
      "oneOf": [
        {
          "required": [
            "static_node_world_aabb"
          ],
          "not": {
            "required": [
              "static_node_world_aabb_unavailable_reason"
            ]
          }
        },
        {
          "required": [
            "static_node_world_aabb_unavailable_reason"
          ],
          "not": {
            "required": [
              "static_node_world_aabb"
            ]
          }
        }
      ],
      "additionalProperties": false
    },
    "scene": {
      "type": "object",
      "required": [
        "scene_index",
        "instance_count",
        "excluded_instance_count"
      ],
      "properties": {
        "scene_index": {
          "type": "integer",
          "minimum": 0
        },
        "name": {
          "type": "string"
        },
        "instance_count": {
          "type": "integer",
          "minimum": 0
        },
        "static_scene_world_aabb": {
          "$ref": "#/$defs/aabb"
        },
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