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IfcSurface

Definition from ISO/CD 10303-42:1992: A surface can be envisioned as a set of connected points in 3-dimensional space which is always locally 2-dimensional, but need not be a manifold.

NOTE Corresponding STEP entity: surface, the following subtypes have been incorporated into IFC - elementary_surface (as IfcElementarySurface), swept_surface (as IfcSweptSurface) and bounded_surface (as IfcBoundedSurface). Please refer to ISO/IS 10303-42:1994, p. 68 for the final definition of the formal standard.

HISTORY New class in IFC Release 1.5

Informal proposition:

  1. A surface has non zero area.
  2. A surface is arcwise connected.

EXPRESS specification:

ENTITY IfcSurface
ABSTRACT SUPERTYPE OF (ONEOF(IfcElementarySurface, IfcSweptSurface, IfcBoundedSurface))
SUBTYPE OF ( IfcGeometricRepresentationItem);
END_ENTITY;

Inheritance graph

ENTITY IfcSurface;
ENTITY IfcRepresentationItem;
INVERSE
LayerAssignments  :  SET OF IfcPresentationLayerAssignment FOR AssignedItems;
StyledByItem  :  SET [0:1] OF IfcStyledItem FOR Item;
ENTITY IfcGeometricRepresentationItem;
ENTITY IfcSurface;
END_ENTITY;