IfcPointOnSurface

Natural language names
Punkt auf einer Oberfläche
Point On Surface
Point de surface
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:

  1. The parametric values specified for u and v shall not be outside the parametric range of the basis surface.
Attribute definitions
#AttributeTypeCardinalityDescription G
1BasisSurfaceIfcSurface The surface to which the parameter values relate. X
2PointParameterUIfcParameterValue The first parameter value of the point location. X
3PointParameterVIfcParameterValue The second parameter value of the point location. X
Inherited definitions from supertypes
Entity inheritance IfcPoint IfcGeometricRepresentationItem IfcRepresentationItem
Attribute inheritance
#AttributeTypeCardinalityDescriptionG
IfcRepresentationItem
LayerAssignmentIfcPresentationLayerAssignment
@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.
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.
X
StyledByItemIfcStyledItem
@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.
IFC2x3 CHANGE  The inverse attribute StyledByItem has been added.
X
IfcGeometricRepresentationItem
IfcPoint
Dim
:=IfcPointDim(SELF)
IfcDimensionCountThe space dimensionality of this abstract class, handled by a function specific for concrete subtypes. Determined by the number of coordinate components in case of IfcCartesianPoint or by the dimensionality of the basis curve or surface in other cases. X
IfcPointOnSurface
1BasisSurfaceIfcSurface The surface to which the parameter values relate. X
2PointParameterUIfcParameterValue The first parameter value of the point location. X
3PointParameterVIfcParameterValue The second parameter value of the point location. X
Formal representations
XML 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;
END_ENTITY;

Link to EXPRESS-G diagram EXPRESS-G diagram

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