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[]"