Geometrische Gruppe | |

Geometric Set |

The IfcGeometricSet is used for the exchange of shape representation consisting of (2D or 3D) points, curves, and surfaces, which do not have a topological structure (such as connected face sets or shells), are not tessellated and are not solid models (such as swept solids, CSG or Brep).

NOTE Definition from ISO/CD 10303-42:

This entity is intended for the transfer of models when a topological structure is not available.

NOTE Entity adapted fromgeometric_setdefined in ISO 10303-42.

HISTORY New entity in IFC2x.

# | Attribute | Type | Cardinality | Description | G |
---|---|---|---|---|---|

1 | Elements | IfcGeometricSetSelect | S[1:?] | The geometric elements which make up the geometric set, these may be points, curves or surfaces; but are required to be of the same coordinate space dimensionality. | X |

Dim :=Elements[1].Dim | IfcDimensionCount | The space dimensionality of this class, it is identical to the first element in the set. A where rule ensures that all elements have the same dimensionality. | X |

Rule | Description |
---|---|

ConsistentDim | All elements within a geometric set shall have the same dimensionality. |

# | Attribute | Type | Cardinality | Description | G |
---|---|---|---|---|---|

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.
IFC2x3 CHANGE The inverse attribute IFC4 CHANGE The inverse attribute | 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.
IFC2x3 CHANGE The inverse attribute | X | |

IfcGeometricRepresentationItem | |||||

IfcGeometricSet | |||||

1 | Elements | IfcGeometricSetSelect | S[1:?] | The geometric elements which make up the geometric set, these may be points, curves or surfaces; but are required to be of the same coordinate space dimensionality. | X |

Dim :=Elements[1].Dim | IfcDimensionCount | The space dimensionality of this class, it is identical to the first element in the set. A where rule ensures that all elements have the same dimensionality. | X |

` <xs:element name="IfcGeometricSet" type="ifc:IfcGeometricSet" substitutionGroup="ifc:IfcGeometricRepresentationItem" nillable="true"/>`

<xs:complexType name="IfcGeometricSet">

<xs:complexContent>

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

<xs:sequence>

<xs:element name="Elements">

<xs:complexType>

<xs:group ref="ifc:IfcGeometricSetSelect" maxOccurs="unbounded"/>

<xs:attribute ref="ifc:itemType" fixed="ifc:IfcGeometricSetSelect"/>

<xs:attribute ref="ifc:cType" fixed="set"/>

<xs:attribute ref="ifc:arraySize" use="optional"/>

</xs:complexType>

</xs:element>

</xs:sequence>

</xs:extension>

</xs:complexContent>

</xs:complexType>

```
ENTITY IfcGeometricSet
```

SUPERTYPE OF(IfcGeometricCurveSet)

SUBTYPE OF (IfcGeometricRepresentationItem)**;**

Elements : SET [1:?] OF IfcGeometricSetSelect;

DERIVE

Dim : IfcDimensionCount := Elements[1].Dim;

WHERE

ConsistentDim : SIZEOF(QUERY(Temp <* Elements |

Temp.Dim <> Elements[1].Dim))

= 0;

END_ENTITY;