{
  "schema_version": "1.0",
  "request": "参考图片生成一个8孔圆法兰，中心孔直径20毫米，外径50毫米，厚度4毫米，螺丝孔使用M3；根据 viewer 选中的几何位置添加2x2、直径2毫米、8毫米间距的贯穿孔阵列、一个3毫米贯穿沉头孔，以及一个10x6x1毫米矩形口袋",
  "route": {
    "selected_backend": "build123d",
    "runner_skill": "cad",
    "project": "text-to-cad",
    "fallback_order": ["simplecadapi", "cadam"],
    "workflow_profiles": ["requirement_refinement", "visual_repair", "source_modification"],
    "downstream_skills": ["cad-viewer"]
  },
  "source": {
    "path": "flange_8x_m3.py",
    "format": "python",
    "backend": "build123d"
  },
  "artifacts": [
    {
      "path": "flange_8x_m3.step",
      "role": "primary"
    },
    {
      "path": "flange_8x_m3.stl",
      "role": "secondary"
    },
    {
      "path": ".flange_8x_m3.step.glb",
      "role": "viewer_mesh_topology"
    }
  ],
  "parameters": {
    "outer_diameter_mm": 50.0,
    "inner_diameter_mm": 20.0,
    "thickness_mm": 4.0,
    "bolt_hole_count": 8,
    "bolt_hole_diameter_mm": 3.4,
    "bolt_circle_diameter_mm": 40.0,
    "angular_spacing_deg": 45.0,
    "viewer_pattern_center_mm": [8.077088362294017, 15.744119598589815],
    "viewer_pattern_hole_diameter_mm": 2.0,
    "viewer_pattern_rows": 2,
    "viewer_pattern_columns": 2,
    "viewer_pattern_pitch_x_mm": 8.0,
    "viewer_pattern_pitch_y_mm": 8.0,
    "viewer_pattern_depth": "through",
    "viewer_pattern_hole_centers_mm": [
      [4.077088362294017, 11.744119598589815],
      [12.077088362294017, 11.744119598589815],
      [4.077088362294017, 19.744119598589815],
      [12.077088362294017, 19.744119598589815]
    ],
    "viewer_countersink_center_mm": [-14.6034432889167, -4.110394299469192],
    "viewer_countersink_hole_diameter_mm": 3.0,
    "viewer_countersink_diameter_mm": 6.0,
    "viewer_countersink_angle_deg": 90.0,
    "viewer_countersink_depth": "through",
    "viewer_pocket_center_mm": [6.197199513379157, -14.374353062530322],
    "viewer_pocket_shape": "rectangle",
    "viewer_pocket_width_mm": 10.0,
    "viewer_pocket_height_mm": 6.0,
    "viewer_pocket_depth_mm": 1.0,
    "viewer_pocket_bottom_z_mm": 3.0
  },
  "assumptions": [
    "M3螺丝孔按普通间隙通孔处理，孔径采用3.4毫米，不是M3攻丝底孔。",
    "未指定分度圆，采用40毫米分度圆，以保持孔到外圆约3.3毫米的最小径向边距。",
    "参考图中的车削纹理作为外观参考，不生成削弱4毫米薄法兰的深槽。",
    "矩形口袋按 surface_xy 对齐全局 XY，沿选中面法向进入材料，深度1毫米。"
  ],
  "validation": [
    {
      "path": "validation.json",
      "status": "passed",
      "checks": {
        "step_valid": true,
        "solid_count": 1,
        "exact_size_mm": [50.0, 50.0, 4.0],
        "topology_faces": 24,
        "topology_edges": 62,
        "m3_clearance_hole_count": 8,
        "m3_clearance_hole_diameter_mm": 3.4,
        "viewer_pattern_hole_count": 4,
        "viewer_pattern_hole_diameter_mm": 2.0,
        "viewer_countersink_hole_diameter_mm": 3.0,
        "viewer_countersink_diameter_mm": 6.0,
        "viewer_countersink_angle_deg": 90.0,
        "viewer_pocket_bottom_center_mm": [6.197199513379157, -14.374353062530322, 3.0],
        "viewer_pocket_bottom_size_mm": [10.0, 6.0],
        "viewer_pocket_depth_mm": 1.0,
        "viewer_mesh_topology": ".flange_8x_m3.step.glb",
        "visual_review": "passed_viewer_pocket_top"
      }
    },
    {
      "path": "review/viewer_pocket_top_20260724T031341Z.png",
      "status": "passed",
      "checks": {
        "snapshot_camera": "top",
        "pocket_visible": true
      }
    }
  ],
  "viewer_links": [
    "http://127.0.0.1:5174/?dir=%2FUsers%2Flk%2FProjects%2FcadSet%2Ftext-to-cad%2Fmodels%2Fcad-router-v1%2Fflange_8x_m3&file=flange_8x_m3.step"
  ]
}