IfcShapeModel

Definition from IAI: The IfcShapeModel represents the concept of a particular geometric and/or topological representation of a product's shape or a product component's shape within a representation context. This representation context has to be a geometric representation context (with the exception of topology representations without associated geometry). The two subtypes are IfcShapeRepresentation to cover the geometric models (or sets) that represent a shape, and IfcTopologyRepresentation to cover the conectivity of a product or product component. The topology may or may not have geometry associated.

The IfcShapeModel can be a shape representation (geometric and/or topologogical) of a product (via IfcProductDefinitionShape), or a shape representation (geometric and/or topologogical) of a component of a product shape (via IfcShapeAspect).

HISTORY New entity in Release IFC 2x Edition 3.

EXPRESS specification:

ENTITY IfcShapeModel

ABSTRACT SUPERTYPE OF

(ONEOF(IfcShapeRepresentation, IfcTopologyRepresentation))

SUBTYPE OF (

IfcRepresentation);

INVERSE

OfShapeAspect

SET [0:1] OF IfcShapeAspect FOR ShapeRepresentations;

WHERE

WR11

(SIZEOF(SELF\IfcRepresentation.OfProductRepresentation) = 1) XOR (SIZEOF(SELF\IfcRepresentation.RepresentationMap) = 1) XOR (SIZEOF(OfShapeAspect) = 1);

END_ENTITY;

Attribute definitions:

OfShapeAspect

Reference to the shape aspect, for which it is the shape representation.

Formal Propositions:

WR11

The IfcShapeModel shall either be used by an IfcProductRepresentation, an IfcRepresentationMap or by an IfcShapeAspect.

Inheritance graph

ENTITY IfcShapeModel;

ENTITY IfcRepresentation;

ContextOfItems

IfcRepresentationContext;

RepresentationIdentifier

OPTIONAL IfcLabel;

RepresentationType

OPTIONAL IfcLabel;

Items

SET [1:?] OF IfcRepresentationItem;

INVERSE

RepresentationMap

SET [0:1] OF IfcRepresentationMap FOR MappedRepresentation;

LayerAssignments

SET OF IfcPresentationLayerAssignment FOR Assigneditems;

OfProductRepresentation

SET [0:1] OF IfcProductRepresentation FOR Representations;

ENTITY IfcShapeModel;

INVERSE

OfShapeAspect

SET [0:1] OF IfcShapeAspect FOR ShapeRepresentations;

END_ENTITY;