8.8.3.17 IfcFaceBasedSurfaceModel
8.8.3.17.1 Semantic definition
The IfcFaceBasedSurfaceModel represents the a shape by connected face sets. The connected faces have a dimensionality 2 and are placed in a coordinate space of dimensionality 3.
Informal Propositions
- The connected face sets shall not overlap or intersect except at common faces, edges or vertices.
- The fbsm faces have dimensionality 2.
8.8.3.17.2 Entity inheritance
-
- IfcFaceBasedSurfaceModel
- IfcAnnotationFillArea
- IfcBooleanResult
- IfcBoundingBox
- IfcCartesianPointList
- IfcCartesianTransformationOperator
- IfcCsgPrimitive3D
- IfcCurve
- IfcDirection
- IfcFillAreaStyleHatching
- IfcFillAreaStyleTiles
- IfcGeometricSet
- IfcHalfSpaceSolid
- IfcLightSource
- IfcPlacement
- IfcPlanarExtent
- IfcPoint
- IfcSectionedSpine
- IfcSegment
- IfcShellBasedSurfaceModel
- IfcSolidModel
- IfcSurface
- IfcTessellatedItem
- IfcTextLiteral
- IfcVector
8.8.3.17.3 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. |
|
| Click to show 2 hidden inherited attributes Click to hide 2 inherited attributes | |||
| IfcFaceBasedSurfaceModel (2) | |||
| 1 | FbsmFaces | SET [1:?] OF IfcConnectedFaceSet |
The set of connected face sets comprising the face based surface model. |
| * | Dim | IfcDimensionCount |
This attribute is formally derived. The space dimensionality of this class, it is always 3. |
8.8.3.17.4 Examples
8.8.3.17.5 Formal representation
ENTITY IfcFaceBasedSurfaceModel
SUBTYPE OF (IfcGeometricRepresentationItem);
FbsmFaces : SET [1:?] OF IfcConnectedFaceSet;
DERIVE
Dim : IfcDimensionCount := 3;
END_ENTITY;