IFC 4.3.1.0 (IFC4X3_ADD1)

8.8.3.43 IfcSweptDiskSolidPolygonal

8.8.3.43.1 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.

Informal Propositions:

  1. 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.

8.8.3.43.2 Entity inheritance

8.8.3.43.3 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.

3

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.

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.

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.

Table 8.8.3.43.A

8.8.3.43.4 Formal propositions

Name Description
CorrectRadii

If a FilletRadius is given, it has to be greater or equal to the Radius of the disk.

NOT(EXISTS(FilletRadius)) OR (FilletRadius >= SELF\IfcSweptDiskSolid.Radius)
DirectrixIsPolyline

The Directrix shall be of type IfcIndexedPolyCurve with no Segments, or of type IfcPolyline.

('IFC4X3_ADD1.IFCPOLYLINE' IN TYPEOF(SELF\IfcSweptDiskSolid.Directrix)) OR
(('IFC4X3_ADD1.IFCINDEXEDPOLYCURVE' IN TYPEOF(SELF\IfcSweptDiskSolid.Directrix)) AND NOT(EXISTS(SELF\IfcSweptDiskSolid.Directrix\IfcIndexedPolyCurve.Segments)))
Table 8.8.3.43.B

8.8.3.43.5 Formal representation

ENTITY IfcSweptDiskSolidPolygonal
 SUBTYPE OF (IfcSweptDiskSolid);
	FilletRadius : OPTIONAL IfcNonNegativeLengthMeasure;
 WHERE
	CorrectRadii : NOT(EXISTS(FilletRadius)) OR (FilletRadius >= SELF\IfcSweptDiskSolid.Radius);
	DirectrixIsPolyline : ('IFC4X3_ADD1.IFCPOLYLINE' IN TYPEOF(SELF\IfcSweptDiskSolid.Directrix)) OR
(('IFC4X3_ADD1.IFCINDEXEDPOLYCURVE' IN TYPEOF(SELF\IfcSweptDiskSolid.Directrix)) AND NOT(EXISTS(SELF\IfcSweptDiskSolid.Directrix\IfcIndexedPolyCurve.Segments)));
END_ENTITY;

8.8.3.43.6 References

8.8.3.43.7 Changelog

8.8.3.43.7.1 IFC4

  • New resource

8.8.3.43.7.2 IFC4.3_ADD1