EXAMPLE Figure 1 illustrates assignment of IfcMaterialProfileSetUsage and IfcMaterialProfileSet to the IfcBeamStandardCase as the beam occurrence and to the IfcBeamType. The same IfcMaterialProfileSet shall be shared by many occurrences of IfcMaterialProfileSetUsage. This relationship shall be consistent to the relationship between the IfcBeamType and the IfcBeamStandardCase.
Figure 1 — Beam profile usage
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EXAMPLE Figure 2 illustrates alignment of cardinal points. NOTE It has to be guaranteed that the use of IfcCardinalPointEnum is consistent to the placement of the extrusion body provided by IfcExtrudedAreaSolid.Position NOTE The cardinal points 8 (top centre) and 6 (mid-depth right) are assigned according to the definition at IfcCardinalPointReference |
Figure 2 — Beam cardinal points |
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EXAMPLE Figure 3 illustrates assignment of a composite profile by using IfcCompositeProfile for geometric representation and several IfcMaterialProfile's within the IfcMaterialProfileSet. |
Figure 3 — Beam composite profiles |
EXAMPLE As shown in Figure 76, the axis shall be defined along the z axis of the object coordinate system. The axis representation can be used to represent the system length of a beam that may extent the body length of the beam.
Figure 1 — Beam axis representation
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EXAMPLE As shown in Figure 77, the axis representation shall be used to represent the cardinal point as the offset between the 'Axis' and the extrusion path of the beam. The extrusion path is provided as IfcExtrudedAreaSolid.ExtrudedDirection and should be parallel to the 'Axis' and the z axis. It has to be guaranteed that the value provided by IfcMaterialProfileSetUsage.CardinalPoint is consistent to the IfcExtrudedAreaSolid.Position. |
Figure 2 — Beam axis cardinal point |
EXAMPLE As shown in Figure 1, the axis shall be defined along the z axis of the object coordinate system. The axis representation can be used to represent the system length of a column that may extent the body length of the column.
Figure 1 — Column axis representation
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EXAMPLE As shown in Figure 2, the axis representation shall be used to represent the cardinal point as the offset between the 'Axis' and the extrusion path of the column. The extrusion path is provided as IfcExtrudedAreaSolid.ExtrudedDirection and should be parallel to the 'Axis'. It has to be guaranteed that the value provided by IfcMaterialProfileSetUsage.CardinalPoint is consistent to the IfcExtrudedAreaSolid.Position. |
Figure 2 — Column axis cardinal point |
EXAMPLE Figure 1 illustrates a planar surface representation where the area of IfcCovering is given by an IfcPolyLoop for planar base surfaces (here provided by the IfcRelSpaceBoundary). The implicit planar surface of the IfcPolyLoop shall be identical with the planar surface defined by the IfcRelSpaceBoundary.
Figure 1 — Covering surface planar
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EXAMPLE Figure 2 illustrates a cylindrical surface representation where the area of the IfcCovering is given by an IfcSurfaceOfLinearExtrusion for cylindrical base surfaces (here given by the IfcRelSpaceBoundary, such as caused by a round wall).
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Figure 2 — Covering surface cylindrical |
EXAMPLE Figure 1 illustrates a body representation where the volume of IfcCovering is given by an IfcExtrudedAreaSolid for planar base surfaces (here given by the IfcRelSpaceBoundary). The extruded area (IfcArbitraryClosedProfileDef) shall be coplanar to the surface defined by the IfcRelSpaceBoundary.
Figure 1 — Covering body planar
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EXAMPLE Figure 2 illustrates a body representation where the volume of the IfcCovering is given by an IfcExtrudedAreaSolid for cylindrical base surfaces (here given by the IfcRelSpaceBoundary - such as caused by a round wall).
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Figure 2 — Covering body circular |
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Figure 1 — Door swing | ||||||||||||||||||
NOTE The containment shall be defined independently of the filling relationship, that is, even if the IfcDoor is a filling of an opening established by IfcRelFillsElement, it is also contained in the spatial structure by IfcRelContainedInSpatialStructure.
Figure 1 — Door spatial containment
EXAMPLE Figure 1 illustrates applying the door lining parameters to the door profile shape representation. The profile defines the outer boundary to which the door lining parameters relate as:
- IfcDoorLiningProperties.LiningDepth starting at distance defined by LiningOffset going into the positive y direction.
- IfcDoorLiningProperties.LiningThickness offset into the inner side of the rectangle.
- IfcDoorLiningProperties.LiningOffset distance along the positive y direction to where the LiningDepth applies.
- IfcDoorLiningProperties.ThresholdThickness starting at the bottom edge of the rectangle into the inner side of the rectangle
- IfcDoorLiningProperties.ThresholdDepth starting at distance defined by LiningOffset going into the positive y direction.
- IfcDoorLiningProperties.TransomOffset starting at the bottom edge of the rectangle (along local x axis) into the inner side of the rectangle, distance provided as percentage of overall height. Distance to the centre line of the transom.
Figure 1 — Door profile
EXAMPLE Any IfcElement may be represented by a bounding box, which shows the maximum extend of the body within the object coordinate system established by the IfcObjectPlacement. As shown in Figure 1, the bounding box representation is given by an IfcShapeRepresentation that includes a single item, an IfcBoundingBox.
Figure 1 — Building element box representation
EXAMPLE As shown in Figure 1, the surface model representation is given by an IfcShapeRepresentation, which includes a single item which is either an IfcShellBasedSurfaceModel, or an IfcFaceBasedSurfaceModel. In some cases it may also be useful to expose a simple representation as a bounding box representation of the same complex shape.
Figure 1 — Element surface model representation
EXAMPLE As shown in Figure 1, the Brep representation is given by an IfcShapeRepresentation, which includes one or more items, all of type IfcFacetedBrep. In some cases it may be useful to also expose a simple representation as a bounding box representation of the same complex shape.
Figure 1 — Building element body boundary representation
EXAMPLE Figure 1 illustrates multiple components modeled as a single occurrence object (here: IfcFastener)
Figure 1 — Element component mapped representation
EXAMPLE As shown in Figure 101, the axis representation can be used to represent the system length of a member that may extent the body length of the member.
Figure 1 — Member axis representation
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EXAMPLE As shown in Figure 102, the axis representation shall be used to represent the cardinal point as the offset between the 'Axis' and the extrusion path of the member. The extrusion path is provided as IfcExtrudedAreaSolid.ExtrudedDirection and should be parallel to the 'Axis'. It has to be guaranteed that the value provided by IfcMaterialProfileSetUsage.CardinalPoint is consistent to the IfcExtrudedAreaSolid.Position. |
Figure 2 — Member axis cardinal point |
Figure 1 — Plate type definition
EXAMPLE Figure 1 illustrates a 'SweptSolid' geometric representation. The following interpretation of dimension parameter applies for polygonal plates (in ground floor view): IfcArbitraryClosedProfileDef.OuterCurve being a closed bounded curve is interpreted as area (or foot print) of the plate.
Figure 1 — Plate body extrusion
EXAMPLE Figure 1 illustrates a 'Clipping' geometric representation with definition of a plate using advanced geometric representation. The profile is extruded non-perpendicular and the plate body is clipped at the eave.
Figure 1 — Plate body clipping
As shown in Figure 31, the IfcGrid defines a placement coordinate system using the ObjectPlacement. The XY plane of the coordinate system is used to place the 2D grid axes. The Representation of IfcGrid is defined using IfcProductRepresentation, referencing an IfcShapeRepresentation, that includes IfcGeometricCurveSet as Items. All grid axes are added as IfcPolyline to the IfcGeometricCurveSet.
Figure 1 — Grid layout
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As shown in Figure 32, the attributes UAxes and VAxes define lists of IfcGridAxis within the context of the grid. Each instance of IfcGridAxis refers to the same instance of IfcCurve (here the subtype IfcPolyline) that is contained within the IfcGeometricCurveSet that represents the IfcGrid. |
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Figure 2 — Grid representation |
EXAMPLE Figure 1 illustrates IfcRamp defining the local placement for all components.
Figure 1 — Ramp placement
Figure 1 — Site survey points
Figure 2 — Site survey points facetation
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Figure 3 — Site breaklines |
Figure 4 — Site breaklines facetation |
EXAMPLE Figure 1 illustrates assignment of IfcMaterialLayerSetUsage and IfcMaterialLayerSet to the IfcSlabStandardCase as the slab occurrence and to the IfcSlabType. The same IfcMaterialLayerSet shall be shared by many occurrences of IfcMaterialLayerSetUsage. This relationship shall be consistent to the relationship between the IfcSlabType and the IfcSlabStandardCase.
Figure 1 — Slab type definition
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Figure 2 — Slab material layers |
EXAMPLE Figure 1 illustrates a 'SweptSolid' geometric representation. The following interpretation of dimension parameter applies for polygonal slabs (in ground floor view): IfcArbitraryClosedProfileDef.OuterCurve: closed bounded curve interpreted as area (or foot print) of the slab.
Figure 1 — Slab body extrusion
EXAMPLE Figure 1 illustrates a 'Clipping' geometric representation with definition of a roof slab using advanced geometric representation. The profile is extruded non-perpendicular and the slab body is clipped at the eave.
Figure 1 — Slab body clipping
EXAMPLE Figure 1 shows a two-dimensional bounded curve representing the foot print of IfcSpace.
Figure 1 — Space footprint
- Profile: IfcArbitraryOpenProfileDef
- Extrusion: The extrusion direction shall be vertically, i.e., along the positive Z Axis of the co-ordinate system of the containing spatial structure element.
- Extrusion: The BasisSurface shall be a surface that is upright, i.e. standing perpendicular to the xy place of the co-ordinate system of the containing spatial structure element.
EXAMPLE Figure 1 illustrates assignment of IfcMaterialLayerSetUsage and IfcMaterialLayerSet to the wall type and the wall occurrence.
Figure 1 — Wall Standard Object Typing
EXAMPLE Figure 1 illustrates an axis representation for a straight wall. In case of a straight wall, the set of items shall include a single geometric representation item of type IfcPolyline or IfcTrimmedCurve with the BasisCurve being an IfcLine. The IfcPolyline or IfcTrimmedCurve shall be parallel (here in a special case co-linear) to the x-axis of the object coordinate system. The direction shall be identical to the direction of the x-axis.
Figure 1 — Wall axis straight
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EXAMPLE Figure 2 illustrates an axis representation for a curved wall. In case of a curved wall, the set of items shall include a single geometric representation item of type IfcTrimmedCurve. The curve shall have a BasisCurve of type IfcCircle. The tangent of the IfcTrimmedCurve shall be parallel at start to the x-axis of the object coordinate system. The direction shall be identical to the direction of the x-axis. |
Figure 2 — Wall axis curved |
Figure 1 — Wall body extrusion straight
Figure 2 — Wall body extrusion curved
Figure 1 — Wall body clipping straight
Figure 2 — Wall body clipping curved
NOTE The containment shall be defined independently of the filling relationship, that is, even if the IfcWindow is a filling of an opening established by IfcRelFillsElement, it is also contained in the spatial structure by an IfcRelContainedInSpatialStructure.
Figure 1 — Window spatial containment