IfcPointOnSurface

Semantic definitions at the entity

Entity definition

The IfcPointOnSurface is a point defined by two parameter value of its defining surface.

NOTE Definition according to ISO/CD 10303-42:1992
A point on surface is a point which lies on a parametric surface. The point is determined by evaluating the surface at a particular pair of parameter values.

NOTE Entity adapted from point_on_surface in ISO 10303-42.

HISTORY New entity in IFC2x2.

Informal Propositions:

The parametric values specified for u and v shall not be outside the parametric range of the basis surface.

Attribute definitions

#	Attribute	Type	Cardinality	Description	C
1	BasisSurface	IfcSurface	[1:1]	The surface to which the parameter values relate.	X
2	PointParameterU	IfcParameterValue	[1:1]	The first parameter value of the point location.	X
3	PointParameterV	IfcParameterValue	[1:1]	The second parameter value of the point location.	X
	Dim :=BasisSurface.Dim	IfcDimensionCount	[1:1]	The space dimensionality of this class, determined by the space dimensionality of the basis surface.	X

Inherited definitions from supertypes

Entity inheritance

Attribute inheritance

#	Attribute	Type	Cardinality	Description	C
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.	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.	X
IfcGeometricRepresentationItem
IfcPoint
IfcPointOnSurface
1	BasisSurface	IfcSurface	[1:1]	The surface to which the parameter values relate.	X
2	PointParameterU	IfcParameterValue	[1:1]	The first parameter value of the point location.	X
3	PointParameterV	IfcParameterValue	[1:1]	The second parameter value of the point location.	X
	Dim :=BasisSurface.Dim	IfcDimensionCount	[1:1]	The space dimensionality of this class, determined by the space dimensionality of the basis surface.	X

Formal representations

XSD Specification

 <xs:element name="IfcPointOnSurface" type="ifc:IfcPointOnSurface" substitutionGroup="ifc:IfcPoint" nillable="true"/>

 <xs:complexType name="IfcPointOnSurface">

  <xs:complexContent>

   <xs:extension base="ifc:IfcPoint">

    <xs:sequence>

     <xs:element name="BasisSurface" type="ifc:IfcSurface" nillable="true"/>

    </xs:sequence>

    <xs:attribute name="PointParameterU" type="ifc:IfcParameterValue" use="optional"/>

    <xs:attribute name="PointParameterV" type="ifc:IfcParameterValue" use="optional"/>

   </xs:extension>

  </xs:complexContent>

 </xs:complexType>

EXPRESS Specification


ENTITY IfcPointOnSurface

 SUBTYPE OF (IfcPoint);

  BasisSurface : IfcSurface;

  PointParameterU : IfcParameterValue;

  PointParameterV : IfcParameterValue;

 DERIVE

  Dim : IfcDimensionCount := BasisSurface.Dim;

END_ENTITY;

 EXPRESS-G diagram

	Punkt auf einer Oberfläche
	Point On Surface
	Point de surface