8.8.3.44 IfcSweptDiskSolidPolygonal
8.8.3.44.1 Semantic definition
The IfcSweptDiskSolidPolygonal is a IfcSweptDiskSolid where the Directrix is restricted to be provided by an poly line only. An optional FilletRadius attribute can be asserted, it is then applied as a fillet to all transitions between the segments of the poly line.
The geometric item IfcIndexedPolyCurve provides a more compact representation compared with IfcPolyline. Therefore it is the preferred curve representation for the Directrix. The IfcIndexedPolyCurve shall not have Segments defined, resticting it to a poly line only. New entity in IFC4.Informal Propositions
- The FilletRadius, if provided, has to be smaller than or equal to the length of the start and end segment of the IfcPolyline, and smaller than or equal to one half of the length of the shortest inner segment.
8.8.3.44.2 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
8.8.3.44.3 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. The inverse attribute LayerAssignments has been added. The inverse attribute LayerAssignment has been restricted to max 1. Upward compatibility for file based exchange is guaranteed. |
|
| 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. The inverse attribute StyledByItem has been added. |
|
| IfcSolidModel (1) | |||
| * | Dim | IfcDimensionCount |
This attribute is formally derived. The space dimensionality of this class, it is always 3. |
| IfcSweptDiskSolid (5) | |||
| 1 | Directrix | IfcCurve |
The curve used to define the sweeping operation. The solid is generated by sweeping a circular disk along the Directrix. |
| 2 | Radius | IfcPositiveLengthMeasure |
The Radius of the circular disk to be swept along the directrix. Denotes the outer radius, if an InnerRadius is applied. |
| 3 | InnerRadius | OPTIONAL IfcPositiveLengthMeasure |
This attribute is optional, if present it defines the radius of a circular hole in the centre of the disk. |
| 4 | StartParam | OPTIONAL IfcParameterValue |
The parameter value on the Directrix at which the sweeping operation commences. If no value is provided the start of the sweeping operation is at the start of the Directrix. The attribute has been changed to OPTIONAL with upward compatibility for file-based exchange. |
| 5 | EndParam | OPTIONAL IfcParameterValue |
The parameter value on the Directrix at which the sweeping operation ends. If no value is provided the end of the sweeping operation is at the end of the Directrix. The attribute has been changed to OPTIONAL with upward compatibility for file-based exchange. |
| Click to show 8 hidden inherited attributes Click to hide 8 inherited attributes | |||
| IfcSweptDiskSolidPolygonal (1) | |||
| 6 | FilletRadius | OPTIONAL IfcNonNegativeLengthMeasure |
The fillet that is equally applied to all transitions between the segments of the IfcPolyline, providing the geometric representation for the Directrix. If omitted, no fillet is applied to the segments. |
8.8.3.44.4 Formal propositions
| Name | Description |
|---|---|
| CorrectRadii |
If a FilletRadius is given, it has to be greater or equal to the Radius of the disk. |
|
|
| DirectrixIsPolyline |
The Directrix shall be of type IfcIndexedPolyCurve with no Segments, or of type IfcPolyline. |
|
|
8.8.3.44.5 Formal representation
ENTITY IfcSweptDiskSolidPolygonal
SUBTYPE OF (IfcSweptDiskSolid);
FilletRadius : OPTIONAL IfcNonNegativeLengthMeasure;
WHERE
CorrectRadii : NOT(EXISTS(FilletRadius)) OR (FilletRadius >= SELF\IfcSweptDiskSolid.Radius);
DirectrixIsPolyline : ('IFC4X3_DEV_bc7847cd.IFCPOLYLINE' IN TYPEOF(SELF\IfcSweptDiskSolid.Directrix)) OR
(('IFC4X3_DEV_bc7847cd.IFCINDEXEDPOLYCURVE' IN TYPEOF(SELF\IfcSweptDiskSolid.Directrix)) AND NOT(EXISTS(SELF\IfcSweptDiskSolid.Directrix\IfcIndexedPolyCurve.Segments)));
END_ENTITY;