IfcRevolvedAreaSolid

Semantic definitions at the entity

Entity definition

A revolved area solid (IfcRevolvedAreaSolid) is a solid created by revolving a planar bounded surface about an axis. Both, the axis and planar bounded surface shall be in the same plane and the axis shall not intersect the interior of the swept area. If the swept area has inner boundaries, i.e. holes defined, then those holes shall be swept into holes of the solid. The direction of revolution is clockwise when viewed along the axis in the positive direction.

NOTE: The IfcRevolvedAreaSolid now directly defines the revolution of a cross section (also referred to as profile). It thereby combines the functionality of the previous IfcAttDrivenRevolvedSegment entity. In contrary to the previous IfcAttDrivenRevolvedSegment, the additional start angle attribute has been omitted. The axis is required to lie in the xy plane of the position coordinate system.

NOTE: Corresponding STEP entity: revolved_area_solid. Please refer to ISO/IS 10303-42:1994, p. 184 for the final definition of the formal standard. The data type of the inherited SweptArea attribute is different, i.e. of type IfcProfileDef. The position attribute has been added to position the cross section used for the revolution.

HISTORY: New entity in IFC Release 1.5, capabilities of this entity have been enhanced in IFC Release 2x.

Informal propositions:

The AxisLine shall lie in the plane of the SweptArea (as defined at supertype IfcSweptAreaSolid).
The AxisLine shall not intersect the interior of the SweptArea (as defined at supertype IfcSweptAreaSolid).
The Angle shall be between 0° and 360°, or 0 and 2p (depending on the unit type for IfcPlaneAngleMeasure).

Illustration:

Purpose
The revolved area solid defines the revolution of a 2D area (given by a profile definition) by an axis and angle. The result is a solid.

Parameter
The swept area is given by a profile definition. This profile is defined

as a 2D bounded curve within the xy plane of the position coordinate system,
as a 2D bounded curve with holes within the xy plane of the position coordinate system,
or as a 2D primitive, defined within a 2D position coordinate system, that is placed relative to the xy plane of the position coordinate system

Attribute definitions

#	Attribute	Type	Cardinality	Description	A
3	Axis	IfcAxis1Placement	[1:1]	Axis about which revolution will take place.	X
4	Angle	IfcPlaneAngleMeasure	[1:1]	Angle through which the sweep will be made. This angle is measured from the plane of the sweep.	X
	AxisLine :=IfcRepresentationItem() \|\| IfcGeometricRepresentationItem () \|\| IfcCurve() \|\| IfcLine(Axis.Location, IfcRepresentationItem() \|\| IfcGeometricRepresentationItem () \|\| IfcVector(Axis.Z,1.0))	IfcLine	[1:1]	The line of the axis of revolution.	X

Inherited definitions from supertypes

Entity inheritance

Attribute inheritance

#	Attribute	Type	Cardinality	Description	A
IfcRepresentationItem
IfcGeometricRepresentationItem
IfcSolidModel
	Dim :=3	IfcDimensionCount	[1:1]	The space dimensionality of this class, it is always 3.	X
IfcSweptAreaSolid
1	SweptArea	IfcProfileDef	[1:1]	The surface defining the area to be swept. It is given as a profile definition within the xy plane of the position coordinate system.	X
2	Position	IfcAxis2Placement3D	[1:1]	Position coordinate system for the swept area.	X
IfcRevolvedAreaSolid
3	Axis	IfcAxis1Placement	[1:1]	Axis about which revolution will take place.	X
4	Angle	IfcPlaneAngleMeasure	[1:1]	Angle through which the sweep will be made. This angle is measured from the plane of the sweep.	X
	AxisLine :=IfcRepresentationItem() \|\| IfcGeometricRepresentationItem () \|\| IfcCurve() \|\| IfcLine(Axis.Location, IfcRepresentationItem() \|\| IfcGeometricRepresentationItem () \|\| IfcVector(Axis.Z,1.0))	IfcLine	[1:1]	The line of the axis of revolution.	X

Formal representations

XSD Specification

 <xs:element name="IfcRevolvedAreaSolid" type="ifc:IfcRevolvedAreaSolid" substitutionGroup="ifc:IfcSweptAreaSolid" nillable="true"/>

 <xs:complexType name="IfcRevolvedAreaSolid">

  <xs:complexContent>

   <xs:extension base="ifc:IfcSweptAreaSolid">

    <xs:sequence>

     <xs:element name="Axis" type="ifc:IfcAxis1Placement" nillable="true"/>

    </xs:sequence>

    <xs:attribute name="Angle" type="ifc:IfcPlaneAngleMeasure" use="optional"/>

   </xs:extension>

  </xs:complexContent>

 </xs:complexType>

EXPRESS Specification


ENTITY IfcRevolvedAreaSolid

 SUBTYPE OF (IfcSweptAreaSolid);

  Axis : IfcAxis1Placement;

  Angle : IfcPlaneAngleMeasure;

 DERIVE

  AxisLine : IfcLine := IfcRepresentationItem() || IfcGeometricRepresentationItem () || IfcCurve() || IfcLine(Axis.Location, 
  IfcRepresentationItem() || IfcGeometricRepresentationItem () || IfcVector(Axis.Z,1.0));

 WHERE

  WR31 : Axis.Location.Coordinates[3] = 0.0;
  WR32 : Axis.Z.DirectionRatios[3] = 0.0;
END_ENTITY;

 EXPRESS-G diagram