IFC (IFC4X3) development IfcCylindricalSurface Semantic definition

The cylindrical surface is a surface unbounded in the direction of z. Bounded cylindrical surfaces are defined by using a subtype of IfcBoundedSurface with BasisSurface being a cylindrical surface.

The inherited attributes are interpreted as

  • SELF\IfcElementarySurface.Position defines the location and orientation of the cylindrical surface.
  • SELF\IfcElementarySurface.Position.Location defines a point on the axis of the cylindrical surface.
  • SELF\IfcElementarySurface.Position.P[3] defines the direction of the axis of the cylindrical surface. Entity inheritance Attributes

# Attribute Type Description
IfcRepresentationItem (2)
LayerAssignment SET [0:1] OF IfcPresentationLayerAssignment FOR AssignedItems

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.

StyledByItem SET [0:1] OF IfcStyledItem FOR Item

Reference to the IfcStyledItem that provides presentation information to the representation, e.g. a curve style, including colour and thickness to a geometric curve.

IfcSurface (1)
* Dim IfcDimensionCount

This attribute is formally derived.


The space dimensionality of IfcSurface. It is always a three-dimensional geometric representation item.

IfcElementarySurface (1)
1 Position IfcAxis2Placement3D

The position and orientation of the surface. This attribute is used in the definition of the parameterization of the surface.

Click to show 4 hidden inherited attributes Click to hide 4 inherited attributes
IfcCylindricalSurface (1)
2 Radius IfcPositiveLengthMeasure

The radius of the cylindrical surface.

Table Formal representation

ENTITY IfcCylindricalSurface
 SUBTYPE OF (IfcElementarySurface);
	Radius : IfcPositiveLengthMeasure;
END_ENTITY; References

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