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IfcExtrudedAreaSolid

Definition from IAI: The extruded area solid (IfcExtrudedAreaSolid) is defined by sweeping a bounded planar surface. The direction of the extrusion is given by the ExtrudedDirection attribute and the length of the extrusion is given by the Depth attribute. If the planar area has inner boundaries, i.e. holes defined, then those holes shall be swept into holes of the solid.

New: The IfcExtrudedArea solid now directly defines the linear extrusion of a cross section (also referred to as profile). It thereby combines the functionality of the previous IfcAttDrivenExtrudedSegment entity. In contrary to the previous IfcAttDrivenExtrudedSegment, the extruded direction can be any which is not perpendicular to the z axis of the position coordinate system.

NOTE Corresponding STEP entity: extruded_area_solid. Please refer to ISO/IS 10303-42:1994, p. 183 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 linear extrusion.

HISTORY New entity in IFC Release 1.5, capabilities of this entity have been enhanced in IFC Release 2x.
ISSUE: See issue log for changes made in IFC Release 1.5. See issue and change log for changes made in IFC Release 2x.

Illustration:

extruded area solid

Purpose
The extruded area solid defines the extrusion of a 2D area (given by a profile definition) by an direction and depth. 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

EXPRESS specification:

ENTITY IfcExtrudedAreaSolid
SUBTYPE OF ( IfcSweptAreaSolid);
ExtrudedDirection  :  IfcDirection;
Depth  :  IfcPositiveLengthMeasure;
WHERE
WR1  :  IfcDotProduct(SELF\IfcSweptAreaSolid.Position.P[3], ExtrudedDirection) <> 0.0;
END_ENTITY;

Attribute definitions:

ExtrudedDirection  :  The direction in which the surface is to be swept.
Depth  :  The distance the surface is to be swept.

Formal Propositions:

WR1  :  The ExtrudedDirection shall be in the direction of the local z-axis of the position coordinate system.

References (1):

Name Type Referred through Express-G
IfcSweptAreaSolid Entity
Subtype
Diagram 3

Inheritance graph

ENTITY IfcExtrudedAreaSolid;
ENTITY IfcSolidModel;
DERIVE
Dim  :  IfcDimensionCount :=  3;
ENTITY IfcSweptAreaSolid;
SweptArea  :  IfcProfileDef;
Position  :  IfcAxis2Placement3D;
ENTITY IfcExtrudedAreaSolid;
ExtrudedDirection  :  IfcDirection;
Depth  :  IfcPositiveLengthMeasure;
END_ENTITY;