3.1 Checklist Model Structure

The project team must clearly define how the models are to be structured:

File name

Ensure that a uniform and consistent naming of the (discipline-specific) models within the project is guaranteed.

Local position and orientation

The local position of the structure is coordinated and is close to the nil point.

The definition of a uniform project coordinate origin and uniform units of measurement are of enormous importance for the subsequent combination of the sub-models. The common reference point is defined as x, y, z coordinates and the angle to the north direction (TrueNorth). All project participants must refer to this reference point. The reference point should be as close as possible to the structure.

Building storey and designation

Designate building storey and define the correct storey height. Assign the correct storey to all objects. Within the project, ensure that the exact designation is used consistently by the project participants, which is sorted numerically and contains a textual description. All models, storeys, building sections and other common content must follow standardized naming conventions.

All discipline-specific sub-models must be constructed in accordance with the building, storey and designation specifications.

Correct use of entities

Use the appropriate IFC type in each case.
Example:

• Wall = ifcWall
• Beam = ifcBeam
• Column = ifcColumn
• Staircase = ifcStair
• Door = ifcDoor
• etc.

As cadwork does not work with object tools, the elements must be assigned with the correct Ifc type.

Detailing

The level of detail of the model elements for data exchange must be defined among the project participants. Many properties can be assigned to elements, but not all of them are necessary in every project. In order to avoid an unnecessary increase in the amount of data and to provide a better overview, it should be determined in advance which properties are actually required.