{
 "id": "23-bracket-multifeature",
 "name": "Multi-feature bracket",
 "description": "Base plate 80x50x8, back wall, inner fillet R5, gusset, 2 base holes, wall hole, front corner chamfers.",
 "exercises": [
  "extrude",
  "extrude_join",
  "fillet",
  "symmetric",
  "offset_plane",
  "extrude_cut",
  "chamfer"
 ],
 "units": {
  "length": "mm",
  "angle": "deg",
  "area": "mm2",
  "volume": "mm3"
 },
 "conventions": {
  "world": "right-handed; Z up. XY/XZ/YZ are the origin planes.",
  "sketch_frame": "sketch-local 2D coords; world = plane.origin + x*plane.x_dir + y*plane.y_dir (origin in mm). Profile 'loops' list sketch entity ids.",
  "point_refs": "'<id>.start' / '<id>.end' / '<id>.center' reuse (share) that existing sketch point; 'at' is its position when referenced.",
  "extrude_direction": "positive = along sketch plane normal unless stated",
  "selections": "selected faces/edges carry 'point': a world-space point on the face / the edge's parametric midpoint; pick the nearest face/edge to it."
 },
 "parameters": [],
 "features": [
  {
   "op": "sketch",
   "name": "Base_sketch",
   "plane": {
    "ref": "XY",
    "origin": [
     0.0,
     0.0,
     0.0
    ],
    "x_dir": [
     1.0,
     0.0,
     0.0
    ],
    "y_dir": [
     0.0,
     1.0,
     0.0
    ],
    "normal": [
     0.0,
     0.0,
     1.0
    ]
   },
   "entities": [
    {
     "type": "line",
     "start": {
      "at": [
       0,
       0
      ]
     },
     "end": {
      "at": [
       80,
       0
      ]
     },
     "id": "l1"
    },
    {
     "type": "line",
     "start": {
      "ref": "l1.end",
      "at": [
       80.0,
       0.0
      ]
     },
     "end": {
      "at": [
       80,
       50
      ]
     },
     "id": "l2"
    },
    {
     "type": "line",
     "start": {
      "ref": "l2.end",
      "at": [
       80.0,
       50.0
      ]
     },
     "end": {
      "at": [
       0,
       50
      ]
     },
     "id": "l3"
    },
    {
     "type": "line",
     "start": {
      "ref": "l3.end",
      "at": [
       0.0,
       50.0
      ]
     },
     "end": {
      "ref": "l1.start",
      "at": [
       0.0,
       0.0
      ]
     },
     "id": "l4"
    }
   ],
   "constraints": [],
   "dimensions": []
  },
  {
   "op": "extrude",
   "name": "Base",
   "operation": "new",
   "profiles": [
    {
     "sketch": "Base_sketch",
     "loops": [
      {
       "outer": true,
       "curves": [
        "l1",
        "l2",
        "l3",
        "l4"
       ]
      }
     ]
    }
   ],
   "extent": {
    "type": "distance",
    "distance": 8,
    "direction": "positive"
   },
   "result_bodies": [
    "Bracket"
   ]
  },
  {
   "op": "sketch",
   "name": "WallSketch",
   "plane": {
    "ref": "face: top of Base (z=8)",
    "origin": [
     0.0,
     0.0,
     8.0
    ],
    "x_dir": [
     1.0,
     0.0,
     0.0
    ],
    "y_dir": [
     0.0,
     1.0,
     0.0
    ],
    "normal": [
     0.0,
     0.0,
     1.0
    ],
    "face": {
     "type": "plane",
     "normal_at_point_on_face": [
      0.0,
      0.0,
      1.0
     ],
     "plane_normal_outward": [
      0.0,
      0.0,
      1.0
     ],
     "point": [
      40.0,
      25.0,
      8.0
     ]
    }
   },
   "entities": [
    {
     "type": "line",
     "start": {
      "at": [
       0.0,
       42.0
      ]
     },
     "end": {
      "at": [
       80.0,
       42.0
      ]
     },
     "id": "l1"
    },
    {
     "type": "line",
     "start": {
      "ref": "l1.end",
      "at": [
       80.0,
       42.0
      ]
     },
     "end": {
      "at": [
       80.0,
       50.0
      ]
     },
     "id": "l2"
    },
    {
     "type": "line",
     "start": {
      "ref": "l2.end",
      "at": [
       80.0,
       50.0
      ]
     },
     "end": {
      "at": [
       0.0,
       50.0
      ]
     },
     "id": "l3"
    },
    {
     "type": "line",
     "start": {
      "ref": "l3.end",
      "at": [
       0.0,
       50.0
      ]
     },
     "end": {
      "ref": "l1.start",
      "at": [
       0.0,
       42.0
      ]
     },
     "id": "l4"
    }
   ],
   "constraints": [],
   "dimensions": []
  },
  {
   "op": "extrude",
   "name": "Wall",
   "operation": "join",
   "profiles": [
    {
     "sketch": "WallSketch",
     "loops": [
      {
       "outer": true,
       "curves": [
        "l1",
        "l2",
        "l3",
        "l4"
       ]
      }
     ]
    }
   ],
   "extent": {
    "type": "distance",
    "distance": 42,
    "direction": "positive"
   },
   "result_bodies": [
    "Bracket"
   ]
  },
  {
   "op": "fillet",
   "name": "InnerFillet",
   "type": "constant_radius",
   "radius": 5,
   "tangent_chain": false,
   "edge_selection": "the X-parallel concave edge where base top (z=8) meets wall front (y=42)",
   "edges": [
    {
     "type": "line",
     "start": [
      80.0,
      42.0,
      8.0
     ],
     "end": [
      0.0,
      42.0,
      8.0
     ],
     "point": [
      40.0,
      42.0,
      8.0
     ]
    }
   ]
  },
  {
   "op": "construction_plane",
   "name": "MidPlane",
   "method": "offset",
   "base": "YZ",
   "offset": 40
  },
  {
   "op": "sketch",
   "name": "GussetSketch",
   "plane": {
    "ref": "construction plane MidPlane (YZ offset 40)",
    "origin": [
     40.0,
     0.0,
     0.0
    ],
    "x_dir": [
     0.0,
     0.0,
     -1.0
    ],
    "y_dir": [
     0.0,
     1.0,
     0.0
    ],
    "normal": [
     1.0,
     0.0,
     0.0
    ]
   },
   "entities": [
    {
     "type": "line",
     "start": {
      "at": [
       -8.0,
       42.0
      ]
     },
     "end": {
      "at": [
       -35.0,
       42.0
      ]
     },
     "id": "l1"
    },
    {
     "type": "line",
     "start": {
      "ref": "l1.end",
      "at": [
       -35.0,
       42.0
      ]
     },
     "end": {
      "at": [
       -8.0,
       15.0
      ]
     },
     "id": "l2"
    },
    {
     "type": "line",
     "start": {
      "ref": "l2.end",
      "at": [
       -8.0,
       15.0
      ]
     },
     "end": {
      "ref": "l1.start",
      "at": [
       -8.0,
       42.0
      ]
     },
     "id": "l3"
    }
   ],
   "constraints": [],
   "dimensions": []
  },
  {
   "op": "extrude",
   "name": "Gusset",
   "operation": "join",
   "profiles": [
    {
     "sketch": "GussetSketch",
     "loops": [
      {
       "outer": true,
       "curves": [
        "l1",
        "l2",
        "l3"
       ]
      }
     ]
    }
   ],
   "extent": {
    "type": "symmetric",
    "distance": 3,
    "is_full_length": false,
    "meaning": "distance on each side"
   },
   "result_bodies": [
    "Bracket"
   ]
  },
  {
   "op": "sketch",
   "name": "BaseHoles",
   "plane": {
    "ref": "XY",
    "origin": [
     0.0,
     0.0,
     0.0
    ],
    "x_dir": [
     1.0,
     0.0,
     0.0
    ],
    "y_dir": [
     0.0,
     1.0,
     0.0
    ],
    "normal": [
     0.0,
     0.0,
     1.0
    ]
   },
   "entities": [
    {
     "type": "circle",
     "center": {
      "at": [
       20,
       20
      ]
     },
     "radius": 4,
     "id": "c1"
    },
    {
     "type": "circle",
     "center": {
      "at": [
       60,
       20
      ]
     },
     "radius": 4,
     "id": "c2"
    }
   ],
   "constraints": [],
   "dimensions": []
  },
  {
   "op": "extrude",
   "name": "BaseHoles",
   "operation": "cut",
   "profiles": [
    {
     "sketch": "BaseHoles",
     "loops": [
      {
       "outer": true,
       "curves": [
        "c1"
       ]
      }
     ]
    },
    {
     "sketch": "BaseHoles",
     "loops": [
      {
       "outer": true,
       "curves": [
        "c2"
       ]
      }
     ]
    }
   ],
   "extent": {
    "type": "through_all",
    "direction": "positive"
   },
   "result_bodies": [
    "Bracket"
   ]
  },
  {
   "op": "sketch",
   "name": "WallHole",
   "plane": {
    "ref": "face: wall front face (y=42, normal -Y)",
    "origin": [
     0.0,
     42.0,
     0.0
    ],
    "x_dir": [
     1.0,
     0.0,
     0.0
    ],
    "y_dir": [
     0.0,
     0.0,
     1.0
    ],
    "normal": [
     0.0,
     -1.0,
     0.0
    ],
    "face": {
     "type": "plane",
     "normal_at_point_on_face": [
      0.0,
      -1.0,
      0.0
     ],
     "plane_normal_outward": [
      0.0,
      -1.0,
      0.0
     ],
     "point": [
      61.5,
      42.0,
      31.5
     ]
    }
   },
   "entities": [
    {
     "type": "circle",
     "center": {
      "at": [
       20.0,
       30.0
      ]
     },
     "radius": 5,
     "id": "c1"
    },
    {
     "type": "circle",
     "center": {
      "at": [
       60.0,
       30.0
      ]
     },
     "radius": 5,
     "id": "c2"
    }
   ],
   "constraints": [],
   "dimensions": []
  },
  {
   "op": "extrude",
   "name": "WallHoles",
   "operation": "cut",
   "profiles": [
    {
     "sketch": "WallHole",
     "loops": [
      {
       "outer": true,
       "curves": [
        "c1"
       ]
      }
     ]
    },
    {
     "sketch": "WallHole",
     "loops": [
      {
       "outer": true,
       "curves": [
        "c2"
       ]
      }
     ]
    }
   ],
   "extent": {
    "type": "distance",
    "distance": 8,
    "direction": "negative"
   },
   "result_bodies": [
    "Bracket"
   ]
  },
  {
   "op": "chamfer",
   "name": "FrontChamfer",
   "type": "equal_distance",
   "distance": 3,
   "tangent_chain": false,
   "edge_selection": "the 2 vertical edges at the front corners of the base (y=0, z 0..8)",
   "edges": [
    {
     "type": "line",
     "start": [
      80.0,
      0.0,
      0.0
     ],
     "end": [
      80.0,
      0.0,
      8.0
     ],
     "point": [
      80.0,
      0.0,
      4.0
     ]
    },
    {
     "type": "line",
     "start": [
      0.0,
      0.0,
      0.0
     ],
     "end": [
      0.0,
      0.0,
      8.0
     ],
     "point": [
      0.0,
      0.0,
      4.0
     ]
    }
   ]
  }
 ]
}