Overview

Short overview of the implementer agreements for the IFC2x3 coordination view

24. Feb 2006 - ISG meeting in Berlin

#CV-2x3-100 correct usage of IfcMaterialLayerSetUsage for IfcSlab [IFC2x3] - modified 15 Dec 06
#CV-2x3-101 requested support of IfcEllipse for profile definitions [IFC2x3]
#CV-2x3-102 no support of b-splines within current IFC implementations [IFC2x2, IFC2x3]
#CV-2x3-103 independent profile geometry for doors and windows [IFC2x3]
#CV-2x3-104 number of doors and windows within one opening is restricted to max 1 [IFC2x2, IFC2x3]
#CV-2x3-105 export of bounding box is no longer mandatory [IFC2x3]
#CV-2x3-106 agreed use of geometric representation context and subcontext [IFC2x3] - modified 05 May 06
#CV-2x3-107 handling of complex opening shapes (reveals, vertical extrusions) [IFC2x3] - modified 05 May 06
#CV-2x3-108 revoke previous agreement on extending the opening thickness [IFC2x3]
#CV-2x3-109 revoke the agreement to provide Pset_Draughting [IFC2x3]
#CV-2x3-110 revoke the agreement on not allowing vertical clipping planes [IFC2x3]
#CV-2x3-111 no doublicated points within a polyloop or polyline [IFC2x2, IFC2x3]
#CV-2x3-112 support for CSG geometry is required on import [IFC2x3]
#CV-2x3-113 support for annotation pattern for hatching is restricted to model hatches [IFC2x3] - modified 05 May 06
#CV-2x3-114 material presentation information for parametric doors and windows not supported[IFC2x3]
#CV-2x3-115 matching imported styles (curve fonts, hatching patterns, text fonts, RGB colours) to system internal styles [IFC2x3]

07. Mar 2006 - ISG Teleconference

#CV-2x3-116 no use of subtypes of IfcStyledItem for assigning presentation information [IFC2x3]

13. Apr 2006 - ISG Groove space

#CV-2x3-117 use of the same parameterization for profiles in IFC2x2 and IFC2x3 based on center of bounding [IFC2x2, IFC2x3]

21. Apr 2006 - ISG 2x3 Certification Groove space

#CV-2x3-118 agreement to use PatternStart and PointOfReferenceHatchLine in IfcFillAreaStyleHatching [IFC2x3]

05. May 2006 - ISG Meeting in Munich

#CV-2x3-119 geometry for decomposed elements shall either be given at the element container or at the element part level [IFC2x3]
#CV-2x3-120 material information for decomposed elements shall only be given at the element part level [IFC2x3]
#CV-2x3-121 decomposed elements shall have a maximum of 1 level decomposition depth [IFC2x3]
#CV-2x3-122 extrusion thickness of opening elements should be within reasonable boundaries [IFC2x2, IFC2x3]
#CV-2x3-123 opening elements shall be within the wall face or slab profile (not misused as arbitrary cuttings) [IFC2x2, IFC2x3] - modified 26 Feb 08
#CV-2x3-124 non vertical walls shall not be exchanged as instances of IfcWallStandardCase [IFC2x2, IFC2x3]
#CV-2x3-125 agreements on the limited subset of hatching style entities and attributes to be supported [IFC2x3]
#CV-2x3-126 agreements on the limited subset of text style entities and attributes to be supported [IFC2x3]
#CV-2x3-127 agreements on the limited subset of surface style entities and attributes to be supported [IFC2x3]

24. Nov 2006 - ISG Meeting in Dijon

#CV-2x3-128 agreement on how to use material layer set and usage for wall types [IFC2x3]
#CV-2x3-129 agreement on how to use CAD layer assignment and the support of layer with style information [IFC2x3]
#CV-2x3-130 agreement on how to use and override curve style information [IFC2x3]
#CV-2x3-131 agreement on how to use and override surface style information [IFC2x3]
#CV-2x3-132 agreement on import of special characters in significant names (like layer, material, or property name) [IFC2x2, IFC2x3]
#CV-2x3-133 Restrict the insertion point of doors and windows in regard to the opening [IFC2x3]

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
#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
#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 Oct 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

23. October 2008 - ISG Meeting in Munich

#CV-2x3-157 agreement on a particular type of building element proxy to exchange provisions for voids

IAI-ISG