Official Release Date of buildingSMART’s IFC4 – March Official Release Date of ISO – March What’s new in IFC4? IFC4 – the new. The new IFC release IFC4 is now also accepted as an ISO standard. ISO has reached the status of a published International Standard. second as an ISO International Standard ISO – see home/store/catalogue_tc/?csnumber= This marks.
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It is iwo platform neutral, open file format specification that is not controlled by a single vendor or group of isk. It is an object-based file format with a data model developed by sio formerly the International Alliance for Interoperability, IAI to facilitate interoperability in the architectureengineering and construction AEC industry, and is a commonly used collaboration format in Building information modeling BIM based projects.
The IFC model specification is open and available. Because of its focus on ease of interoperability between software platforms, the Danish government has made the use 166739 IFC format s compulsory for publicly aided building projects. Twelve US companies joined the consortium. IFC defines multiple file formats that may be used, supporting various encodings of the same underlying data. At the most abstract level, IFC divides all entities into rooted and non-rooted entities.
Rooted entities derive from IfcRoot and have a concept of identity having a GUIDalong with attributes for name, description, and revision control. Non-rooted entities do not have identity and instances only exist if referenced from a rooted instance directly or indirectly.
IfcRoot is subdivided into three abstract concepts: IfcObjectDefinition is split into object occurrences and object types. IfcObject captures object occurrences such as a product installation having serial number and physical placement.
IfcTypeObject captures type definitions or templates such as a product type having a particular model number and common shape. Occurrences and types are further isl into six fundamental concepts: IfcRelationship captures relationships among objects. There are five fundamental relationship types: IfcPropertyDefinition captures dynamically extensible property sets.
A property set contains one or more properties which may be a single value e. While IFC defines several hundred property sets for specific types, custom property sets may be defined by application vendors or end users. IfcProduct is the base class for all physical objects and is subdivided into spatial elements, physical elements, structural analysis items, and other concepts. Products may have associated materials, shape representations, and placement in space.
Distribution elements HVACelectricalplumbing have a concept of ports where elements may have specific connections for various services, and connected together using cables, pipes, or ducts to form a system. Various connectivity relationships are used for building elements such as walls having openings filled by doors or windows.
Materials may be defined for products as a whole, or as layers, profiles, or constituents for specified parts. Representations may be defined for explicit 3D shape, and optionally as parametric constraints.
Each representation is identified by IfcShapeRepresentation with a well-known name. IFC defines various quantities specific to each element type and the method of calculation is to geometry and relationships. IfcProcess is the base class for processes and is subdivided into tasks, events, and procedures. Processes may have durations and be scheduled to occur at specific time periods.
Processes may be sequenced such that a successor task may start after a predecessor task finishes, following the Critical Path Method.
Processes may be nested into sub-processes for summary roll-up. Processes may be assigned to products indicating the output produced by the work performed. IfcResource is the base class for resources and is subdivided into materials, labor, equipment, subcontracts, crews, and more.
Resources may have various costs and calendars of availability. Resources may be nested into sub-resources for granular allocation.
IFC4 as ISO standard — Welcome to
uso Resources may be assigned to processes indicating tasks performed on behalf of a resource. IfcProject encapsulates an overall project and indicates the project name, description, default units, currency, coordinate system, and other contextual information. A valid IFC file must always include exactly one IfcProject instance, from which all other objects relate directly or indirectly. In addition to project-specific 1679, an IfcProject may also reference external projects from which shared definitions may be imported such as product types.
Industry Foundation Classes – Wikipedia
Projects support uso control where any IfcRoot-based entity has a unique identifier and may be marked as added, modified, deleted, or having no change. Such capability allows multiple IFC files to be merged deterministically, ensuring data integrity without human intervention. From Wikipedia, the free encyclopedia.
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