8.8.3.2 IfcAdvancedBrepWithVoids
8.8.3.2.1 Semantic definition
The IfcAdvancedBrepWithVoids is a specialization of an advanced B-rep which contains one or more voids in its interior. The voids are represented as closed shells which are defined so that the shell normal point into the void.
Informal Propositions
- Each void shell shall be disjoint from the outer shell and from every other void shell
- Each void shell shall be enclosed within the outer shell but not within any other void shell. In particular the outer shell is not in the set of void shells
- Each shell in the IfcManifoldSolidBrep shall be referenced only once.
- All the faces of all the shells in the IfcAdvancedBrep and the IfcAdvancedBrepWithVoids.Voids shall be of type IfcAdvancedFace.
8.8.3.2.2 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
8.8.3.2.3 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. |
| 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. |
| Click to show 4 hidden inherited attributes Click to hide 4 inherited attributes | |||
| IfcAdvancedBrepWithVoids (1) | |||
| 2 | Voids | SET [1:?] OF IfcClosedShell |
No description available. |
8.8.3.2.4 Formal propositions
| Name | Description |
|---|---|
| VoidsHaveAdvancedFaces |
Each face of the voids within the advanced B-rep with voids shall be of type IfcAdvancedFace. |
|
|
8.8.3.2.5 Formal representation
ENTITY IfcAdvancedBrepWithVoids
SUBTYPE OF (IfcAdvancedBrep);
Voids : SET [1:?] OF IfcClosedShell;
WHERE
VoidsHaveAdvancedFaces : SIZEOF (QUERY (Vsh <* Voids |
SIZEOF (QUERY (Afs <* Vsh.CfsFaces |
(NOT ('IFC4X3_DEV_7e95fe8.IFCADVANCEDFACE' IN TYPEOF(Afs)))
)) = 0
)) = 0;
END_ENTITY;