IFC Entity

In an IFC model, the project information (generated, for example, from an ArchiCAD project) is represented as a set of IFC Entities - such as elements, surfaces, and their relationships. Each IFC Entity (for example, an IfcWall) includes a fixed number of IFC Attributes, plus any number of additional IFC Properties. The IFC scheme encompasses several hundred entities, of which the building element-type entities (such as IfcWall and IfcColumn) represent only 25.

IFCEntity.png 

Some IFC Entities express characteristics of other entities. Some of these correspond to ArchiCAD attributes. These correspondences are mapped automatically when the IFC model is generated or exported, or when the IFC model is imported.

Table 1:

ArchiCAD Attribute

IFC Entity

Layer

IfcPresentationLayerAssignment

Building Material

IfcMaterial

Surface

IfcSurfaceStyleRendering

Composite

IfcMaterialLayerSet (extruded geometry) or IfcMaterialList (BREP geometry)

Profile

IfcProfileDef