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  • IFC open source and freeware summary — Welcome to buildingSMART-Tech.org
    based at the Bauhaus University Weimar Germany and supported by the Bauhaus University and HOCHTIEF AG read more about open IFC Tools Open source software library for IFC file format IfcOpenShell is an open source software library that helps users and software developers to work with the IFC file format IfcOpenShell uses Open CASCADE to interpret the implicit geometry in IFC files IfcOpenShell s permissive LGPL license encourages it to be used freely in both proprietary and open source software read more about IfcOpenShell Open IFC read and write examples using different programming languages Based on the IFC engine DLL a set of open read write examples are provided for anyone to get familiar with the first steps on how to use IFC A subset is published on this site as the Hello Wall tutorial The IFC engine DLL is developed at TNO Netherlands and is made available freely for non commercial usage read more about Open IFC read write examples Open Source STEP Class Library Generates C and Python from EXPRESS schemas including IFC 2x3 and 2x4 Includes software classes for SDAI ISO 10303 22 and a part21 file reader writer executable Used for the STEP translator in BRL CAD BSD license allows for free use in commercial software read more about Open Source STEP Class Library Freeware IFC SDK The IFC SDK project provides a Software Development Kit SDK for reading and writing a Building Information Model BIM defined in Industry Foundation Classes IFC format First version of the IFC SDK is provided in C programming language and is compliant with IFC 2X3 TC1 standard developed by buildingSMART International read more about IFC SDK Freeware IFC File Analyzer The IFC File Analyzer generates an Excel spreadsheet from an IFC file A worksheet is created for each type of

    Original URL path: http://www.buildingsmart-tech.org/implementation/get-started/ifc-open-source (2016-02-11)
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  • Overview — Welcome to buildingSMART-Tech.org
    information Implementation guidelines published IFC Implementation Guide IFC File Header Implementation Guide ifcXML Implementation Guide specific guideline for using the ifcXML the XML document format for delivering IFC datasets Implementation agreements available A list of implementer agreements are developed and maintained by MSG in collaboration with the Implementer Support Group ISG to support the ongoing implementation and certification activities NOTE The implementer agreements had previously been published at the former separate web page of ISG and they are currently moved to this official technical website of buildingSMART A list of implementation issues is maintained in an Issue Database for implementation specific issues and requests NOTE Access is provided to all members of buildingSMART that sign up for the issue database Supporting documentation examples and listing of developer toosl A small Hello Wall example have been published on this side to give a first and easy introduction into writing an IFC exchange file A string encoding decoding example code to demonstrate the use of non ASCII characters and Unicode in IFC data files A list of IFC development toolboxes is provided at this site Please check it for further references A highlighted list of open source or free development tools to

    Original URL path: http://www.buildingsmart-tech.org/implementation/ifc-implementation (2016-02-11)
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  • IFC Impl Agreements Summary — Welcome to buildingSMART-Tech.org
    curve style information CV 2x3 131 agreement on how to use and override surface style information CV 2x3 132 agreement on import of special characters in significant names like layer material or property name CV 2x3 133 Restrict the insertion point of doors and windows in regard to the opening 13 Mar 2007 ISG Meeting in Waltham CV 2x3 134 for a complex wall the opening has to be associated with the aggregate the IfcWall and not with the parts the IfcBuildingElementPart s CV 2x3 135 assignment of surface color to surface models dealing with the backface issue CV 2x3 136 agreement on exporting the construction type CV 2x3 137 agreement on the export of profile names for section profiles in addition to geometric parameters 23 May 2007 ISG Meeting in Helsinki CV 2x3 138 agreement on providing a presentation layer for doors and windows based on parametric description CV 2x3 139 agreement on an add on to the coordination view to include base quantities CV 2x3 140 agreement on an add on to the coordination view to include space boundaries CV 2x3 141 agreement on having maximum of one instance of IfcSite CV 2x3 142 agreement on having at least one instance of IfcBuilding as part of the spatial structure CV 2x3 143 agreement on having the containment tree and the relative placement tree identical for spatial elements 27 Feb 2008 ISG Meeting in Prague CV 2x3 144 agreement on roofs being aggregates and shall have at least one contained element and no own geometry withdrawn 06 02 2012 CV 2x3 145 agreement on clipping of round walls to require compatible geometry for wall body and restricted clipping planes CV 2x3 146 agreement on consistent export of shells by having each vertex defined only once and shared by edges CV 2x3 147 agreement on single and double sided faces in surface models to be determined by IfcSurfaceStyle CV 2x3 148 agreement on exporting geographic data if available including latitude longitude elevation address and true north modified 13 07 2011 CV 2x3 149 agreement to add support for certain types of IfcCovering to be added to the coordination view 24 June 2008 ISG Meeting in Amsterdam CV 2x3 150 agreement on how to split an opening between two walls e g in a staircase CV 2x3 151 agreement on how to differentiate space boundaries between first level and second level CV 2x3 152 agreement that all spaces shall have a body shape representation CV 2x3 153 agreement that virtual elements should could be ignored on import CV 2x3 154 agreement on the compression mechanism for ifcZIP modified 23 10 2008 CV 2x3 155 agreement on implementation of first level space boundaries CV 2x3 156 agreement on exporting CAD presentation layer for multi layer walls modified 20 03 2011 23 October 2008 ISG Meeting in Munich CV 2x3 157 agreement on a particular type of building element proxy to exchange provisions for voids Jan Sept 2010 official buildingSMART certification 2 0

    Original URL path: http://www.buildingsmart-tech.org/implementation/ifc-implementation/ifc-impl-agreements (2016-02-11)
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  • IFC Impl Guide Summary — Welcome to buildingSMART-Tech.org
    an overview on IFC implementation with particular focus on the requirements of the IFC coordination view the IFC implementation guide does not supersede the particular definitions and implementer agreements of an IFC model view definition see the IFC header implementation guide for additional guidance for the header section on an IFC file Implementation get involved first steps and tools IFC2x3 impl guidance IFC Impl Agreements IFC Impl Guide IFC Header

    Original URL path: http://www.buildingsmart-tech.org/implementation/ifc-implementation/ifc-impl-guide (2016-02-11)
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  • Summary — Welcome to buildingSMART-Tech.org
    header section as defined in ISO 10303 21 It contains data about name of the IFC schema version description about the content and the options used for the file creation name of the file its authors the application that created the file and the IFC preprocessor toolbox used The following figure shows a table with typical IFC header information and short explanation for each field The detailed definitions and guidelines are provided in the IFC header implementation guide ISO 10303 21 HEADER FILE DESCRIPTION ViewDefinition CoordinationView 2 1 FILE NAME C IAI Test Building ifc 2008 02 11T11 35 07 Andreas Geiger AndreasGeiger iai fzk de Forschungszentrum Karlsruhe ECCO Toolkit Version V 3 2 1 IfcExplorer Version 2 2a Build 437 Karl Heinz Haefele FILE SCHEMA IFC2X3 ENDSEC DATA 1 actual content of the IFC exchange structure ENDSEC END ISO 10303 21 Implementation get involved first steps and tools IFC2x3 impl guidance IFC Impl Agreements IFC Impl Guide IFC Header Guide IFC4 impl guidance Implementer s community accompanying documents frequently asked questions Implementations Search Advanced Search IFC Dev Blog IFC Dev Blog More Registration This site contains content which is only available to registered users To get access to the

    Original URL path: http://www.buildingsmart-tech.org/implementation/ifc-implementation/ifc-header (2016-02-11)
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  • IFC4 impl guidance summary — Welcome to buildingSMART-Tech.org
    developer page for more information Basic Knowledge If you are new to IFC implementation it is relevant to read some background and generic information about IFC in Basic IFC knowledge This basic knowledge is independent of the particular IFC release If you are mainly interested in the differences between IFC2x3 and IFC look here Helpful tools Everybody that is implementing IFC needs some kind of parser to retrieve and or generate IFC content Developing such parsers keeping performance when files grow in size can take a lot of time but there are good solutions that away this effort in the form of Toolboxes Helpful viewers To view geometry as well as properties and relations within IFC files it is not needed to use a CAD or other commercial software package Several vendors have free IFC viewers available IFC4 compared to IFC2x3 Using IFC2x3 files in an IFC4 implementation environment and vise versa requires particular care This is discussed here Model View Definition Especially when implementing IFC it is important to understand the concept and restrictions of the Model View Definition you want to support Model View Definitions for the upcoming IFC4 release are yet to be formalized Examples As with any implementation task work by example helps understand the work that has to be done and what should be done The Model Support Group offers examples as well as example code that can be used for this purpose All source code is free to be used and changed for commercial and non commercial purposes the used toolbox is only free in non commercial projects but also can be exchanged with other toolboxes Examples IFC4 Hello Wall example IFC4 Hello House example Implementation get involved first steps and tools IFC2x3 impl guidance IFC4 impl guidance Basic IFC knowledge Helpful tools Toolboxes

    Original URL path: http://www.buildingsmart-tech.org/implementation/ifc4-implementation (2016-02-11)
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  • Basic IFC knowledge — Welcome to buildingSMART-Tech.org
    schema and alternatively an XML schema Currently the latest version is the Release Candidate 4 of IFC4 It can be downloaded at IFC4 RC4 page On top of the schema MVDs Model View Definitions are defined that describe what parts of the schema are used within a certain IFC file and or extra restrictions on top of the schema IFC4 is describing each instance of a building component that is contained in the IFC file The instance contains semantic data like its name description type wall vs door relations with other instances connections to walls other objects opening elements position and relation in the building structure as well as geometry and property sets New to IFC4 is that each instance has also a type defined in previous versions this was only valid for a subset of the instances Non geometrical information can be attached to instances as well as to types Several instances can refer to the same type The position of instances is absolute or relative towards the position of another instance these relative placements can be nested and several levels deep Geometry of each visible instance is defined It is however possible to reuse defined geometry from other instances Not all defined geometry in an IFC file is visible in CAD or viewers For example space boundaries between walls and spaces are often defined but mostly not shown Each instance can have more than 1 geometrical representation and a single 3D representation of an instance can have more than one color IFC4 files are full of relations Many of these relations are inverse relations defined by the schema and not visible in the text view of an IFC file Implementation get involved first steps and tools IFC2x3 impl guidance IFC4 impl guidance Basic IFC knowledge Helpful tools Toolboxes

    Original URL path: http://www.buildingsmart-tech.org/implementation/ifc4-implementation/basic-ifc-knowledge (2016-02-11)
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  • Helpful tools (Toolboxes) — Welcome to buildingSMART-Tech.org
    toolkits will do the job note that many STEP Express toolkits will also import export ifcXML serialization Toolboxes are also differentiated by the programming languages they support such as Java C C etc When starting using a toolbox it is important to know if you want to use late binding or early binding Late binding the toolbox is used as such and the model schema in this case the IFC4 schema can be loaded on the fly In most cases the ISO standard API SDAI is used to enable interaction with the toolbox Early binding based on the schema an interface is generated created The benefit of this interface is that it knows the schema and during implementation the language helps you with correct implementation by giving only the valid options Not all toolboxes support both early binding and late binding Some toolboxes also included code to generate the visualization of each object for certain versions of IFC Next to the stat of the art professional toolboxes there are also very good quality free toolboxes available Implementation without a toolbox is possible especially for export Building good quality and performing import for large files is time consuming and complex Implementation

    Original URL path: http://www.buildingsmart-tech.org/implementation/ifc4-implementation/helpful-tools (2016-02-11)
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