The examples demonstrate the use of various geometric shape representation types to express a simple geometric form of a building element proxy. All example files uses the same basic structure of the data set and only differ in the geometric representation items used to define the same shape (a block of 1m x 1m x 2m).

The basic structure provided with the sample IFC files include:

basic_shape_fig-1.png 8,1 KB
EXAMPLE  The geometry of the proxy is a 3D block with length=1m, width=1m and height=2m. It is positioned with a local coordinate system at 10m,0m,0m from the coordinate origin of the parent coordinate system of the building. The local object coordinate system has no rotation.

See Figure 1 for the geometric shape of the example.

Figure 1 — Basic shape of the proxy being a block.

 

The same block geometry can be expressed using different 3D models. The example IFC files introduce the swept solid model, surface model, boundary representation model, constructive solid geometry model and the tesselated surface model.

NOTE  Depending on the model view definition some representation types may not be allowed in actual exchange scenarios.