IfcSweptDiskSolidPolygonal

BACnet MVD

#### IfcSweptDiskSolidPolygonal

Natural language names

| Festkörper - Entlang einer Polylinie extrudierte Kreisscheibe
| Swept Disk Solid Polygonal

Change log

Item | SPF | XML | Change | Description
--- | --- | --- | --- | ---
IFC2x3 to IFC4
IfcSweptDiskSolidPolygonal |  |  | ADDED |

##### Semantic definitions at the entity

Entity 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.

> NOTE The geometric item IfcIndexedPolyCurve provides a more compact representation compared with IfcPolyline. Therefore it is the prefered curve representation for the Directrix. The IfcIndexedPolyCurve shall not have Segments defined, resticting it to a poly line only.

> HISTORY New entity in IFC4.

Informal Propositions:

1. The FilletRadius, if provided, has to be smaller then or equal to the length of the start and end segment of the IfcPolyline, and smaller then or equal to one half of the lenght of the shortest inner segment.

Attribute definitions

# | Attribute | Type | Cardinality | Description | B
--- | --- | --- | --- | --- | ---
6 | FilletRadius | IfcPositiveLengthMeasure | ? | The fillet that is equally applied to all transitions between the segments of the IfcPolyline, providing the geometric representation for the Directrix. If omited, no fillet is applied to the segments. |  | X

Formal Propositions

Rule | 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.

##### Inherited definitions from supertypes

Entity inheritance
Attribute inheritance

# | Attribute | Type | Cardinality | Description | B
--- | --- | --- | --- | --- | ---
IfcRepresentationItem

LayerAssignment

IfcPresentationLayerAssignment
@AssignedItems

S[0:1]

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.

> IFC2x3 CHANGE The inverse attribute LayerAssignments has been added.

> IFC4 CHANGE The inverse attribute LayerAssignment has been restricted to max 1. Upward compatibility for file based exchange is guaranteed.

X

StyledByItem

IfcStyledItem
@Item

S[0:1]

Reference to the IfcStyledItem that provides presentation information to the representation, e.g. a curve style, including colour and thickness to a geometric curve.

> IFC2x3 CHANGE The inverse attribute StyledByItem has been added.

X

X

IfcGeometricRepresentationItem
IfcSolidModel
| Dim :=3 | IfcDimensionCount |  | The space dimensionality of this class, it is always 3. | X | X
IfcSweptDiskSolid
1 | Directrix | IfcCurve |  | The curve used to define the sweeping operation. The solid is generated by sweeping a circular disk along the Directrix. |  | X
2 | Radius | IfcPositiveLengthMeasure |  | The Radius of the circular disk to be swept along the directrix. Denotes the outer radius, if an InnerRadius is applied. |  | X
3 | InnerRadius | IfcPositiveLengthMeasure | ? | This attribute is optional, if present it defines the radius of a circular hole in the centre of the disk. |  | X

4

StartParam

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..

> IFC4 CHANGE The attribute has been changed to OPTIONAL with upward compatibility for file-based exchange.

X

5

EndParam

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..

> IFC4 CHANGE The attribute has been changed to OPTIONAL with upward compatibility for file-based exchange.

X

IfcSweptDiskSolidPolygonal
6 | FilletRadius | IfcPositiveLengthMeasure | ? | The fillet that is equally applied to all transitions between the segments of the IfcPolyline, providing the geometric representation for the Directrix. If omited, no fillet is applied to the segments. |  | X

##### Formal representations

XML Specification
`<xs:element name="IfcSweptDiskSolidPolygonal" type="ifc:IfcSweptDiskSolidPolygonal" substitutionGroup="ifc:IfcSweptDiskSolid" nillable="true"/>
<xs:complexType name="IfcSweptDiskSolidPolygonal">
<xs:complexContent>
<xs:extension base="ifc:IfcSweptDiskSolid">
<xs:attribute name="FilletRadius" type="ifc:IfcPositiveLengthMeasure" use="optional"/>
</xs:extension>
</xs:complexContent>
</xs:complexType>
`
EXPRESS Specification
`ENTITY IfcSweptDiskSolidPolygonal
SUBTYPE OF (IfcSweptDiskSolid);
FilletRadius : OPTIONAL IfcPositiveLengthMeasure;
WHERE
CorrectRadii : NOT(EXISTS(FilletRadius)) OR (FilletRadius >= SELF\IfcSweptDiskSolid.Radius);
DirectrixIsPolyline : ('IFCGEOMETRYRESOURCE.IfcPolyline' IN TYPEOF(SELF\IfcSweptDiskSolid.Directrix)) OR
(('IFCGEOMETRYRESOURCE.IfcIndexedPolyCurve' IN TYPEOF(SELF\IfcSweptDiskSolid.Directrix)) AND NOT(EXISTS(SELF\IfcSweptDiskSolid.Directrix.Segments)));
END_ENTITY;

EXPRESS-G diagram

`

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