IFC export (experimental)

IFC export is experimental and may change. If you hit an exporter limitation or confusing output, reach out on Discord.

Overview

OpenGeometry can export B-Reps and scenes to IFC4 (text / Part 21 style). You can export a single B-Rep payload or export a whole scene through OGSceneManager. IFC export supports an optional semantics mapping that lets you control which IFC classes to emit and attach properties.

Initialization

Initialize the WASM module once before using OGSceneManager:

import { OpenGeometry } from "opengeometry";

await OpenGeometry.create({ wasmURL: "/opengeometry_bg.wasm" });

Export APIs

exportBrepToIfc

import { OGSceneManager } from "opengeometry";

const manager = new OGSceneManager();
const result = manager.exportBrepToIfc(brepSerialized);

exportSceneToIfc / exportCurrentSceneToIfc

import { OGSceneManager } from "opengeometry";

const manager = new OGSceneManager();
const sceneId = manager.createScene("ifc export");

const result = manager.exportSceneToIfc(sceneId);
// or:
const result2 = manager.exportCurrentSceneToIfc();

Result type

export*ToIfc(...) returns an OGIfcExportResult:

string

IFC text output.

string

A JSON string containing export statistics (elements written, semantics applied, fallbacks, and more).

Config JSON

All IFC exports accept an optional config_json string. If it is null, undefined, or an empty string, OpenGeometry uses defaults. If you provide config_json, it must deserialize into the full IfcExportConfig shape (required fields must be present). Example JSON payload:

{
  "schema": "Ifc4Add2",
  "project_name": "OpenGeometry Project",
  "site_name": "OpenGeometry Site",
  "building_name": "OpenGeometry Building",
  "storey_name": "OpenGeometry Storey",
  "scale": 1.0,
  "error_policy": "BestEffort",
  "validate_topology": true,
  "require_closed_shell": true,
  "semantics": {
    "wall-1": {
      "ifc_class": "IFCWALL",
      "name": "Exterior wall",
      "description": "Demo export wall",
      "tag": "W1",
      "property_sets": {
        "Pset_WallCommon": {
          "Reference": "W1"
        }
      },
      "quantity_sets": {
        "BaseQuantities": {
          "Length": 6.0
        }
      }
    }
  }
}

Semantics mapping

The semantics map is keyed by your entity_id values in the scene. When you specify ifc_class, OpenGeometry validates it against the allowed list and:

Uses the requested class when it is supported
Falls back to IFCBUILDINGELEMENTPROXY in best-effort mode
Errors in strict mode

Supported classes:

IFCBUILDINGELEMENTPROXY
IFCWALL
IFCSLAB
IFCCOLUMN
IFCBEAM
IFCMEMBER
IFCDOOR
IFCWINDOW
IFCROOF
IFCSTAIR
IFCRAILING
IFCFOOTING

Examples

Export and download IFC in the browser

const result = manager.exportCurrentSceneToIfc();

const blob = new Blob([result.text], { type: "text/plain" });
const url = URL.createObjectURL(blob);

const link = document.createElement("a");
link.href = url;
link.download = "model.ifc";
link.click();

URL.revokeObjectURL(url);

Native-only file export

Native-only builds also expose exportSceneToIfcFile(...) (not available in browser/WASM builds).

Exports for an overview of available exporters and runtime constraints
STL export
STEP export (experimental)
Scene Management - Organizing geometry entities

Live demo

There is no dedicated IFC export demo page yet. Start from the demo index: OpenGeometry demos.

2D Primitives

3D Shapes

Operations

Export (Experimental)

Overview

Initialization

Export APIs

exportBrepToIfc

exportSceneToIfc / exportCurrentSceneToIfc

Result type

Config JSON

Semantics mapping

Examples

Export and download IFC in the browser

Native-only file export

Live demo

​Overview

​Initialization

​Export APIs

​exportBrepToIfc

​exportSceneToIfc / exportCurrentSceneToIfc

​Result type

​Config JSON

​Semantics mapping

​Examples

​Export and download IFC in the browser

​Native-only file export

​Related

​Live demo

Overview

Initialization

Export APIs

exportBrepToIfc

exportSceneToIfc / exportCurrentSceneToIfc

Result type

Config JSON

Semantics mapping

Examples

Export and download IFC in the browser

Native-only file export

Related

Live demo