IFC (IFC4X3) development IfcSphericalSurface Semantic definition

The IfcSphericalSurface is a bounded elementary surface. The inherited Position attribute defines the IfcAxisPlacement3D and provides:

  • SELF\IfcElementarySurface.Position: The location and orientation of the axis system for the primitive.
  • SELF\IfcElementarySurface.Position.Location: The center of the spherical surface.
  • SELF\IfcElementarySurface.Position.Position[3]: The z axis points at its positive direction towards the north pole, and by its negative directions towards the south pole. 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
IfcSphericalSurface (1)
2 Radius IfcPositiveLengthMeasure

The radius of the sphere.

Table Formal representation

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

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