8.8.3.22 IfcGeometricSet
8.8.3.22.1 Semantic definition
The IfcGeometricSet is used for the exchange of shape representation consisting of (2D or 3D) points, curves, and surfaces, which do not have a topological structure (such as connected face sets or shells), are not tessellated and are not solid models (such as swept solids, CSG or Brep).
8.8.3.22.2 Entity inheritance
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- IfcGeometricSet
- IfcAnnotationFillArea
- IfcBooleanResult
- IfcBoundingBox
- IfcCartesianPointList
- IfcCartesianTransformationOperator
- IfcCsgPrimitive3D
- IfcCurve
- IfcDirection
- IfcFaceBasedSurfaceModel
- IfcFillAreaStyleHatching
- IfcFillAreaStyleTiles
- IfcHalfSpaceSolid
- IfcLightSource
- IfcPlacement
- IfcPlanarExtent
- IfcPoint
- IfcSectionedSpine
- IfcSegment
- IfcShellBasedSurfaceModel
- IfcSolidModel
- IfcSurface
- IfcTessellatedItem
- IfcTextLiteral
- IfcVector
8.8.3.22.3 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 | |||
IfcGeometricSet (2) | |||
1 | Elements | SET [1:?] OF IfcGeometricSetSelect |
The geometric elements which make up the geometric set, these may be points, curves or surfaces; but are required to be of the same coordinate space dimensionality. |
* | Dim | IfcDimensionCount |
This attribute is formally derived.
The space dimensionality of this class, it is identical to the first element in the set. A where rule ensures that all elements have the same dimensionality. |
8.8.3.22.4 Formal propositions
Name | Description |
---|---|
ConsistentDim |
All elements within a geometric set shall have the same dimensionality. |
|
8.8.3.22.5 Formal representation
ENTITY IfcGeometricSet
SUPERTYPE OF (ONEOF
(IfcGeometricCurveSet))
SUBTYPE OF (IfcGeometricRepresentationItem);
Elements : SET [1:?] OF IfcGeometricSetSelect;
DERIVE
Dim : IfcDimensionCount := Elements[1].Dim;
WHERE
ConsistentDim : SIZEOF(QUERY(Temp <* Elements |
Temp.Dim <> Elements[1].Dim))
= 0;
END_ENTITY;