8.8.3.18 IfcFacetedBrep
8.8.3.18.1 Semantic definition
The IfcFacetedBrep is a manifold solid brep with the restriction that all faces are planar and bounded polygons.
The faceted B-rep has been introduced in order to support the larger number of systems that allow boundary type solid representations with planar surfaces only.
Informal Propositions
- All the bounding loops of all the faces of all the shells in the IfcFacetedBrep shall be of type IfcPolyLoop.
- All vertices shall be referenced by all polyloops, sharing the vertex. I.e., each Cartesian point shall be references by at least three polyloops.
8.8.3.18.2 Entity inheritance
-
- IfcSolidModel
- IfcAnnotationFillArea
- IfcBooleanResult
- IfcBoundingBox
- IfcCartesianPointList
- IfcCartesianTransformationOperator
- IfcCsgPrimitive3D
- IfcCurve
- IfcDirection
- IfcFaceBasedSurfaceModel
- IfcFillAreaStyleHatching
- IfcFillAreaStyleTiles
- IfcGeometricSet
- IfcHalfSpaceSolid
- IfcLightSource
- IfcPlacement
- IfcPlanarExtent
- IfcPoint
- IfcSectionedSpine
- IfcSegment
- IfcShellBasedSurfaceModel
- IfcSurface
- IfcTessellatedItem
- IfcTextLiteral
- IfcVector
8.8.3.18.3 Attributes
| # | Attribute | Type | Description |
|---|---|---|---|
| IfcRepresentationItem (2) | |||
| LayerAssignment | SET [0:1] OF IfcPresentationLayerAssignment FOR AssignedItems |
Assignment of the representation item to a single or multiple layer(s). The LayerAssignments can override a LayerAssignments of the IfcRepresentation it is used within the list of Items. |
|
| StyledByItem | SET [0:1] OF IfcStyledItem FOR Item |
Reference to the IfcStyledItem that provides presentation information to the representation, e.g. a curve style, including colour and thickness to a geometric curve. |
|
| IfcSolidModel (1) | |||
| * | Dim | IfcDimensionCount |
This attribute is formally derived. The space dimensionality of this class, it is always 3. |
| Click to show 3 hidden inherited attributes Click to hide 3 inherited attributes | |||
| IfcManifoldSolidBrep (1) | |||
| 1 | Outer | IfcClosedShell |
A closed shell defining the exterior boundary of the solid. The shell normal shall point away from the interior of the solid. |
8.8.3.18.4 Examples
8.8.3.18.5 Formal representation
ENTITY IfcFacetedBrep
SUPERTYPE OF (ONEOF
(IfcFacetedBrepWithVoids))
SUBTYPE OF (IfcManifoldSolidBrep);
END_ENTITY;