IfcExtrudedAreaSolidTapered is defined by sweeping a cross section along a linear spine. The cross section may change along the sweep from the shape of the start cross section into the shape of the end cross section. The resulting solid is bounded by three or more faces: A start face, an end face (each defined by start and end planes and sections), and one or more lateral faces. Each lateral face is a ruled surface defined by a pair of corresponding edges of the start and end section.
NOTE Given that the start and end section is provided by a polygon, the corresponding vertices of the start and end cross section are connected, forming a quadrilateral polygon between each pair of corresponding vertices. The surface defined by the bounding quadrilateral polygon is a ruled surface, that could be approximated by triangulation.
The linear spine is defined by:
The start cross section is defined by SELF\IfcSweptAreaSolid.SweptArea:
The end cross section is defined by EndSweptArea:
In case of two parameterized profiles the shape is constructed as follows:
In case of Cartesian transformation of the start cross section the shape is constructed as follows:
HISTORY New entity in IFC4.
|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.|
> 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.
|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.|
> IFC2x3 CHANGE The inverse attribute StyledByItem has been added.
|Dim||INVALID||The space dimensionality of this class, it is always 3.|
|1||SweptArea||IfcProfileDef||The surface defining the area to be swept. It is given as a profile definition within the xy plane of the position coordinate system.|
|2||Position||OPTIONAL IfcAxis2Placement3D||Position coordinate system for the resulting swept solid of the sweeping operation. The position coordinate system allows for re-positioning of the swept solid. If not provided, the swept solid remains within the position as determined by the cross section or by the directrix used for the sweeping operation.|
> IFC4 CHANGE The attribute has been changed to OPTIONAL with upward compatibility for file-based exchange.
|3||ExtrudedDirection||IfcDirection||The direction in which the surface, provided by SweptArea is to be swept.|
|4||Depth||IfcPositiveLengthMeasure||The distance the surface is to be swept along the ExtrudedDirection.|
|5||EndSweptArea||IfcProfileDef||The surface defining the end of the swept area. It is given as a profile definition. The position coordinate system of the EndSwptArea is generated by translating the _SELF\IfcSweptAreaSolid.Position_ along the _SELF\IfcExtrudedAreaSolid.ExtrudedDirection_ by the distance of _SELF\IfcExtrudedAreaSolid.Depth_.|
ENTITY IfcExtrudedAreaSolidTapered SUBTYPE OF (IfcExtrudedAreaSolid); EndSweptArea : IfcProfileDef; WHERE CorrectProfileAssignment : IfcTaperedSweptAreaProfiles(SELF\IfcSweptAreaSolid.SweptArea, SELF.EndSweptArea); END_ENTITY;