Added value: +{
+  "description": "Optional: true for a wall of the EXISTING building when the scene is an extension. cao_permis then counts as created only what the works add.",
+  "type": "boolean"
+}

Previous value: -[
-  "baignoire",
-  "chauffe_eau",
-  "compteur_eau",
-  "douche",
-  "evier",
-  "lavabo",
-  "radiateur",
-  "wc"
-]New value: +[
+  "baignoire",
+  "chauffe_eau",
+  "compteur_eau",
+  "douche",
+  "evier",
+  "lavabo",
+  "module_hydraulique",
+  "pac_exterieure",
+  "radiateur",
+  "wc"
+]

Added value: +{
+  "description": "Named wall/slab layer sets declared by the project. A key that matches an inferred kind (mur_exterieur, refend, cloison, plancher, toiture) or murs[].composition drops the Hypothese flag. Each value is {libelle, couches: [{cle, epaisseur?}]}. cle: enduit, bloc_beton, isolant, ba13, ossature, enduit_platre, beton_arme, tuile, charpente, etancheite. Omit epaisseur on the load-bearing layer.",
+  "type": "object"
+}

Added value: +{
+  "description": "Optional Lambert-93 (EPSG:2154) false origin for IfcMapConversion. Local millimetres are scaled by 0.001 to CRS metres. Do not invent coordinates: omit est/nord if unknown (origin stays 0). orientation is the angle in degrees of project X from map East, counterclockwise.",
+  "properties": {
+    "altitude": {
+      "description": "Orthogonal height in metres (NGF-IGN69 for Lambert-93).",
+      "type": "number"
+    },
+    "crs": {
+      "description": "Projected CRS name. Default EPSG:2154 (Lambert-93).",
+      "type": "string"
+    },
+    "est": {
+      "description": "Easting in metres in the CRS. Omit if unknown — never invent.",
+      "type": "number"
+    },
+    "nord": {
+      "description": "Northing in metres in the CRS. Omit if unknown — never invent.",
+      "type": "number"
+    },
+    "orientation": {
+      "description": "Angle in degrees of the project's X axis from map East, counterclockwise. Default 0.",
+      "type": "number"
+    }
+  },
+  "type": "object"
+}

Added value: +{
+  "description": "Optional key into the scene-level compositions object. When omitted, the exporter infers mur_exterieur / refend / cloison from geometry. A matching declared composition drops the Hypothese flag in the IFC.",
+  "type": "string"
+}

Added value: +{
+  "description": "Optional inline material layers [{cle, epaisseur?}]. cle is one of enduit, bloc_beton, isolant, ba13, ossature, enduit_platre, beton_arme, tuile, charpente, etancheite. Omit epaisseur on the load-bearing layer so it takes the remainder of the wall thickness.",
+  "type": "array"
+}

Added value: +{
+  "description": "Optional single material key: the whole thickness becomes one load-bearing layer instead of a type composition.",
+  "type": "string"
+}

Previous value: -"Boxes (furniture, volumes): center x,y + dims l,p,h (mm)"New value: +"Boxes (furniture, volumes): a rectangular block placed by its CENTRE, not by a corner. Millimetres, same frame as murs[]."

Added value: +"Height along Z (mm)"

Added value: +"Length along X before rotation (mm)"

Added value: +"Depth along Y before rotation (mm)"

Added value: +"Rotation around the box centre, in DEGREES counter-clockwise (not radians). Default 0"

Added value: +"Centre X of the box (mm) — not a corner"

Added value: +"Centre Y of the box (mm) — not a corner"

Added value: +"Underside height above the floor (mm). 0 = resting on the floor; raise it for a wall unit or a shelf"

Previous value: -"Walls: plan segments extruded vertically"New value: +"Walls: plan segments extruded vertically. Every coordinate in this whole scene is in MILLIMETRES, in a single plan frame whose origin you choose — X to the right, Y upward, Z up from the floor. Keep one consistent origin across murs/boites/plan: the generators never recentre anything for you."

Added value: +"Wall thickness (mm), spread evenly on both sides of the axis — the axis is the centreline, not a face. Default 200"

Added value: +"Wall height (mm) from floor level. Default 2500, a usual French ceiling height"

Added value: +"Start point X of the wall axis (mm)"

Added value: +"End point X of the wall axis (mm)"

Added value: +"Start point Y of the wall axis (mm)"

Added value: +"End point Y of the wall axis (mm)"

Added value: +"Opening height (mm), measured up from `z`. `z + hauteur` must stay under the wall height"

Added value: +"Opening width (mm) measured along the wall, from `position`. Must fit inside the wall segment"

Previous value: -"2D reference lines"New value: +"2D reference lines — drawn flat, never extruded and never counted in the quantities. Use them for axes, plot limits or setting-out marks."

Added value: +"Start X (mm), same frame as murs[]"

Added value: +"End X (mm), same frame as murs[]"

Added value: +"Start Y (mm), same frame as murs[]"

Added value: +"End Y (mm), same frame as murs[]"

Added value: +"Circles on the 2D plan, alongside plan[] lines: each has a centre and a radius, in the same unit as the plan. Use for round shapes a polyline would render badly — fillets, posts, manholes."

Added value: +"Radius, same unit as plan[]"

Added value: +"Centre X, same unit as plan[]"

Added value: +"Centre Y, same unit as plan[]"

Added value: +{
+  "description": "Paint/finish per wall — used only by cao_pdf. Colors the elevations (exterior face) and the axonometric view (face auto-detected by orientation relative to the building's centroid).",
+  "items": {
+    "properties": {
+      "couleur": {
+        "description": "Hex color, e.g. '#e2e0d5' — default per type",
+        "type": "string"
+      },
+      "face": {
+        "default": "interieur",
+        "enum": [
+          "interieur",
+          "exterieur"
+        ],
+        "type": "string"
+      },
+      "finition": {
+        "description": "Informational only, doesn't affect rendering",
+        "enum": [
+          "mat",
+          "satin",
+          "brillant",
+          "structure"
+        ],
+        "type": "string"
+      },
+      "mur": {
+        "description": "Index in murs[]",
+        "type": "integer"
+      },
+      "type": {
+        "default": "peinture",
+        "enum": [
+          "beton_cire",
+          "carrelage_mural",
+          "enduit",
+          "lambris",
+          "papier_peint",
+          "peinture"
+        ],
+        "type": "string"
+      }
+    },
+    "required": [
+      "mur"
+    ],
+    "type": "object"
+  },
+  "type": "array"
+}

Added value: +{
+  "description": "Electrical symbols (outlets, switches, lights…) — used only by cao_pdf (dedicated technical plan + quantities), no effect on dxf/metres/render. Position: attached to a wall (`mur`+`position`, like ouvertures) or free (`x`,`y`).",
+  "items": {
+    "properties": {
+      "mur": {
+        "type": "integer"
+      },
+      "position": {
+        "type": "number"
+      },
+      "type": {
+        "default": "prise",
+        "enum": [
+          "detecteur_fumee",
+          "interrupteur",
+          "luminaire",
+          "prise",
+          "prise_rj45",
+          "prise_spe",
+          "tableau_electrique",
+          "va_et_vient",
+          "vmc"
+        ],
+        "type": "string"
+      },
+      "x": {
+        "type": "number"
+      },
+      "y": {
+        "type": "number"
+      },
+      "z": {
+        "description": "Default per type (NF C 15-100-informed: outlets 30cm, switches 110cm; light/smoke detector/vmc default to ceiling height)",
+        "type": "number"
+      }
+    },
+    "type": "object"
+  },
+  "type": "array"
+}

Added value: +{
+  "description": "Doors/windows embedded in a wall — used only by cao_pdf (elevations + axonometric view), no effect on dxf/metres.",
+  "items": {
+    "properties": {
+      "hauteur": {
+        "type": "number"
+      },
+      "largeur": {
+        "type": "number"
+      },
+      "mur": {
+        "description": "Index of the host wall in murs[] (0-based)",
+        "type": "integer"
+      },
+      "position": {
+        "description": "Distance in mm from the wall's start (x1,y1)",
+        "type": "number"
+      },
+      "type": {
+        "default": "fenetre",
+        "enum": [
+          "fenetre",
+          "porte"
+        ],
+        "type": "string"
+      },
+      "z": {
+        "description": "Sill height (mm) — default 900 (window) or 0 (door)",
+        "type": "number"
+      }
+    },
+    "required": [
+      "mur",
+      "position",
+      "largeur",
+      "hauteur"
+    ],
+    "type": "object"
+  },
+  "type": "array"
+}

Added value: +{
+  "description": "Sanitary fixtures (sink, WC, shower…) — used only by cao_pdf. Same positioning as electricite.",
+  "items": {
+    "properties": {
+      "h": {
+        "type": "number"
+      },
+      "l": {
+        "type": "number"
+      },
+      "mur": {
+        "type": "integer"
+      },
+      "p": {
+        "type": "number"
+      },
+      "position": {
+        "type": "number"
+      },
+      "rotation": {
+        "default": 0,
+        "type": "number"
+      },
+      "type": {
+        "default": "evier",
+        "enum": [
+          "baignoire",
+          "chauffe_eau",
+          "compteur_eau",
+          "douche",
+          "evier",
+          "lavabo",
+          "radiateur",
+          "wc"
+        ],
+        "type": "string"
+      },
+      "x": {
+        "type": "number"
+      },
+      "y": {
+        "type": "number"
+      },
+      "z": {
+        "type": "number"
+      }
+    },
+    "type": "object"
+  },
+  "type": "array"
+}

Added value: +{
+  "description": "Plumbing pipe runs (EF/EC/EU/EV/EP/chauffage) — used only by cao_pdf (technical plan + linear-meter quantities per type).",
+  "items": {
+    "properties": {
+      "diametre": {
+        "description": "mm, default per type",
+        "type": "number"
+      },
+      "trace": {
+        "description": "At least 2 points (mm), freely drawn in plan",
+        "items": {
+          "properties": {
+            "x": {
+              "type": "number"
+            },
+            "y": {
+              "type": "number"
+            }
+          },
+          "type": "object"
+        },
+        "type": "array"
+      },
+      "type": {
+        "default": "ef",
+        "enum": [
+          "ef",
+          "ec",
+          "eu",
+          "ev",
+          "ep",
+          "chauffage"
+        ],
+        "type": "string"
+      }
+    },
+    "required": [
+      "trace"
+    ],
+    "type": "object"
+  },
+  "type": "array"
+}

Added value: +{
+  "description": "Roofs — used only by cao_pdf. WITHOUT this field: a flat roof is auto-generated over the footprint of ALL walls (legacy default). WITH it: compose freely — each entry can target a subset of walls (via `murs`), letting you build an L-shaped building's roof, or add a dormer on top of a main roof.",
+  "items": {
+    "properties": {
+      "apex": {
+        "description": "Free apex position — 'personnalise' only (default: 'plat' if omitted)",
+        "properties": {
+          "x": {
+            "type": "number"
+          },
+          "y": {
+            "type": "number"
+          },
+          "z": {
+            "type": "number"
+          }
+        },
+        "type": "object"
+      },
+      "debord": {
+        "default": 200,
+        "description": "Eaves overhang (mm) on the auto footprint",
+        "type": "number"
+      },
+      "epaisseur": {
+        "default": 180,
+        "description": "Slab thickness (mm) — 'plat' only",
+        "type": "number"
+      },
+      "hauteur": {
+        "description": "'chien_assis' only: front wall height, default 900",
+        "type": "number"
+      },
+      "hauteur_faitage": {
+        "default": 1200,
+        "description": "Ridge/apex/dome height above z (mm); 600 for 'chien_assis'",
+        "type": "number"
+      },
+      "largeur": {
+        "description": "'chien_assis' only, default 1000",
+        "type": "number"
+      },
+      "murs": {
+        "description": "Wall indices this roof section covers (default: all walls). Ignored if `polygone` is given.",
+        "items": {
+          "type": "integer"
+        },
+        "type": "array"
+      },
+      "polygone": {
+        "description": "Custom footprint (mm) — overrides the auto rectangle. Any type except 'chien_assis'.",
+        "items": {
+          "properties": {
+            "x": {
+              "type": "number"
+            },
+            "y": {
+              "type": "number"
+            }
+          },
+          "type": "object"
+        },
+        "type": "array"
+      },
+      "profondeur": {
+        "description": "'chien_assis' only, default 800",
+        "type": "number"
+      },
+      "rayon": {
+        "description": "Base radius (mm) — 'conique'/'dome' (default: from footprint)",
+        "type": "number"
+      },
+      "rotation": {
+        "default": 0,
+        "description": "Ridge orientation in degrees — 'deux_pans' only (0 = along X axis)",
+        "type": "number"
+      },
+      "segments": {
+        "default": 16,
+        "description": "Facet count — 'conique'/'dome'",
+        "type": "integer"
+      },
+      "type": {
+        "default": "plat",
+        "enum": [
+          "chien_assis",
+          "conique",
+          "deux_pans",
+          "dome",
+          "personnalise",
+          "plat",
+          "quatre_pans"
+        ],
+        "type": "string"
+      },
+      "x": {
+        "description": "'chien_assis' only: center x",
+        "type": "number"
+      },
+      "y": {
+        "description": "'chien_assis' only: center y — POSITION it on the carrying roof slope",
+        "type": "number"
+      },
+      "z": {
+        "description": "Base altitude (mm) — default: top of the walls covered",
+        "type": "number"
+      }
+    },
+    "type": "object"
+  },
+  "type": "array"
+}