IFC Syntax : Geometry Representations

IFC separates what an object is (semantics : IfcWall, IfcBeam, IfcDoor) from what it looks like (geometry). The bridge is the representation framework : a layered chain every shape-bearing product walks, plus the context entities that fix the coordinate frame. This skill owns the framework and the wiring. The individual geometry primitives (extrusions, Breps, tessellation) live in their own dedicated skills.

Applies to IFC2x3, IFC4, and IFC4.3. The core framework entities are version-stable ; the value tables grew across versions. See Version Differences.

Quick Reference

The product-to-shape chain

Every shape-bearing product resolves its geometry down a fixed chain :