8.8.3.12 IfcCsgSolid
8.8.3.12.1 Semantic definition
An IfcCsgSolid is the representation of a 3D shape using constructive solid geometry model. It is represented by a single 3D CSG primitive, or as a result of a Boolean operation. The operants of a Boolean operation can be Boolean operations themselves forming a CSG tree. The following volumes can be parts of the CSG tree:
- Boundary representation models, such as IfcFacetedBrep, IfcFacetedBrepWithVoids,
- Closed tesselated representation modles, such as IfcPolygonalFaceSet, IfcTriangulatedFaceSet,
- Swept area solids, such as IfcExtrudedAreaSolid, IfcRevolvedAreaSolid, and their subtypes for tapering,
- Advanced swept area solids, such as IfcSurfaceCurveSweptAreaSolid), IfcFixedReferenceSweptAreaSolid, IfcSweptDiskSolid
- Half space solids, such as IfcHalfSpaceSolid and its subtypes), and
- CSG primitives, the subtypes of IfcCsgPrimitive3D.
8.8.3.12.2 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
8.8.3.12.3 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 | |||
| IfcCsgSolid (1) | |||
| 1 | TreeRootExpression | IfcCsgSelect |
Boolean expression of primitives and regularized operators describing the solid. The root of the tree of Boolean expressions is given explicitly as an IfcBooleanResult entitiy or as a primitive (subtypes of IfcCsgPrimitive3D). |
8.8.3.12.4 Formal representation
ENTITY IfcCsgSolid
SUBTYPE OF (IfcSolidModel);
TreeRootExpression : IfcCsgSelect;
END_ENTITY;