ifcos-impl-geometry

To extract IFC geometry efficiently for large batches, use the IfcOpenShell geometry iterator instead of processing elements individually. This batching approach avoids performance traps common in bulk mesh extraction workflows while maintaining correct placements and unit scales.

Tessellated meshes and BRep output differ in precision and use cases. Switching to USE_BREP_DATA provides OpenCASCADE BRep output for CAD and boolean operations, while default tessellated mesh output is suitable for visualization and downstream processing pipelines.

Authored IFC geometry may appear incorrectly if placements and coordinate contexts are invalid. You must create required representation contexts like Model and Body, assign representations to products, and apply placement chains consistently using USE_WORLD_COORDS to ensure correct positioning.

To apply unit scale factors when creating IFC geometric representations, respect IFC project units by applying scale factors during extraction or authoring. This ensures that geometry created across IFC2X3, IFC4, and IFC4X3 maintains correct dimensions and world placements.

IfcOpenShell create_shape works with IFC4X3 by creating required representation contexts. You must establish the root Model context first, then the Body context, and assign these representations to products to ensure valid geometry generation across IFC2X3, IFC4, and IFC4X3 schemas.

You can convert extracted IFC geometry into export-ready formats like glTF or OBJ by preserving coordinate transforms during extraction. Using IfcOpenShell to output tessellated meshes with correct placements allows seamless integration into downstream visualization pipelines.