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6.0 Object Functionality

This section of the standard discusses the requirements for improving the functionality and performance of BIM objects so as not to detrimentally affect the performance of a model into which they may be placed.

6.4 Parametric behaviour

	6.4 Parametric behaviour This sub-section of the standard discusses the requirements for creating objects with parametric behaviour.

6.4.1	Functional behaviour
	Parametric objects that are reliant upon host objects in/on which they are placed, shall be created with the specific functionality to manipulate the host object, or vice versa, as necessary to suit their purpose. Such as a parametric window object that shall be modelled so as to create a corresponding void in the wall object into which it would be placed or alternatively if the wall thickness changed the window dimension would adjust to suit.

6.4.2	Geometric behaviour
	Parametric objects shall be created when an object can represent geometrical variants of an object type. The parametric capability of the object shall be limited to the available variants of the physical element it represents. For example, if a physical element is available in 4 different lengths, limit the parametric length function of the object to those 4 available lengths.

6.4.3	Multiple IFC types
	Objects shall not be created with parametric capability to allow the object to represent multipleIfcElementType’s. For example, do not create one object that can represent a bath and also represent a sink, as these objects are represented by different IfcElementType's. In this situation duplicate parametric objects shall be created and assigned the corresponding IfcElementType, one to represent each IfcElementType required. For example, one to represent a parametric bath and one to represent a parametric sink.

6.4.4	Reference items
	When modelling objects with parametric geometry, the parametric behaviour shall be controlled by reference items such as planes, lines or points.

6.4.5	Use limitation
	The use of parametric behaviour shall be limited to that deemed necessary, or required, to avoid over-constraining the functionality of the object.

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OBOS V1.0

Open BIM Object standard V1 Introduction/Conventions

1 BIM Objects

1.0 Bim Objects

2 Naming Conventions

2-1 General naming req 2-2 Object ﬁle naming req 2-3 Property naming req 2-4 Property set naming req 2-5 Material naming req 2-6 View control naming req 2-7 Material image ﬁle naming

3 Object Classification

3.0 Object Classification

4 Object Properties & Grouping

4-1 General object PropertyReq 4-2 Object type or instance 4-3 IFC Properties 4-4 Administration properties 4-5 Proprietary object prop. 4-6 Classiﬁcation properties 4-7 Construction speciﬁcation 4-8 AssetFacilities management 4-9 Product performance prop. 4-10 Property grouping

5 Graphical/Geometric Object

5-1 Object graphical detail 5-2 Geometric modelling req 5-3 What to model

6 Object Functionality

6-1 Object performance 6-2 Object relationships 6-3 Visibility/Views 6-4 Parametric behaviour

7 Import, Export and Linking

7-1 Importing information 7-2 Exporting BIM objects

8 Definitions & Glossary

8 Definitions & Glossary

OBOS Appendix A

OBOS Appendix A

New Zealand Annexure

NZ Annexure - Scope NZ1-1 NZ Naming Requirements NZ1-2 NZ Object Properties