IfcSurfaceOfLinearExtrusion

Semantic definitions at the entity

Entity definition

The IfcSurfaceOfLinearExtrusion is a surface derived by sweeping a curve along a vector.

NOTE Definition according to ISO/CD 10303-42:1992
This surface is a simple swept surface or a generalized cylinder obtained by sweeping a curve in a given direction. The parameterization is as follows where the curve has a parameterization λ(u):

V = ExtrusionAxis

The parameterization range for v is -∞ < v < ∞ and for u it is defined by the curve parameterization.

NOTE Entity adapted from surface_of_linear_extrusion defined in ISO 10303-42.

HISTORY New entity in IFC2x.

Informal Propositions:

The surface shall not self-intersect

Attribute definitions

#	Attribute	Type	Cardinality	Description	B
3	ExtrudedDirection	IfcDirection	[1:1]	The direction of the extrusion.	X
4	Depth	IfcLengthMeasure	[1:1]	The depth of the extrusion, it determines the parameterization.	X
	ExtrusionAxis :=IfcRepresentationItem() \|\| IfcGeometricRepresentationItem () \|\| IfcVector (ExtrudedDirection, Depth)	IfcVector	[1:1]	The extrusion axis defined as vector.	X

Inherited definitions from supertypes

Entity inheritance

Attribute inheritance

#	Attribute	Type	Cardinality	Description	B
IfcRepresentationItem
	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.	X
IfcGeometricRepresentationItem
IfcSurface
	Dim :=3	IfcDimensionCount	[1:1]	The space dimensionality of IfcSurface. It is always a three-dimensional geometric representation item.	X
IfcSweptSurface
1	SweptCurve	IfcProfileDef	[1:1]	The curve to be swept in defining the surface. The curve is defined as a profile within the position coordinate system.	X
2	Position	-		This attribute is out of scope for this model view definition and shall not be set.
IfcSurfaceOfLinearExtrusion
3	ExtrudedDirection	IfcDirection	[1:1]	The direction of the extrusion.	X
4	Depth	IfcLengthMeasure	[1:1]	The depth of the extrusion, it determines the parameterization.	X
	ExtrusionAxis :=IfcRepresentationItem() \|\| IfcGeometricRepresentationItem () \|\| IfcVector (ExtrudedDirection, Depth)	IfcVector	[1:1]	The extrusion axis defined as vector.	X

Formal representations

XSD Specification

 <xs:element name="IfcSurfaceOfLinearExtrusion" type="ifc:IfcSurfaceOfLinearExtrusion" substitutionGroup="ifc:IfcSweptSurface" nillable="true"/>

 <xs:complexType name="IfcSurfaceOfLinearExtrusion">

  <xs:complexContent>

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

    <xs:sequence>

     <xs:element name="ExtrudedDirection" type="ifc:IfcDirection" nillable="true"/>

    </xs:sequence>

    <xs:attribute name="Depth" type="ifc:IfcLengthMeasure" use="optional"/>

   </xs:extension>

  </xs:complexContent>

 </xs:complexType>

EXPRESS Specification


ENTITY IfcSurfaceOfLinearExtrusion

 SUBTYPE OF (IfcSweptSurface);

  ExtrudedDirection : IfcDirection;

  Depth : IfcLengthMeasure;

 DERIVE

  ExtrusionAxis : IfcVector := IfcRepresentationItem() || IfcGeometricRepresentationItem () || IfcVector (ExtrudedDirection, Depth);

 WHERE

  DepthGreaterZero : Depth > 0.;
END_ENTITY;

 EXPRESS-G diagram

Item	Change	Description
IFC2x3 to IFC4
IfcSurfaceOfLinearExtrusion
Position	MODIFIED	Instantiation changed to OPTIONAL.

	Oberfläche - Entlang einem Vektor extrudiert
	Surface Of Linear Extrusion
	Extrusion linéaire ou surfacique