IFC (IFC4X3_ADD2) under development IfcSpiral

ABSTRACT This definition may not be instantiated Semantic definition

Spirals are curves that revolve around a point while increasing its length. In general, these curves are parameterized in the following way: x = r(φ) cosφ y = r(φ) sinφ

In the case of the clothoid and higher order transition spirals, the parametrization is: x = ∫cos &Theta dl y = ∫sin &Theta dl

where &Theta is the deflection or bearing angle and dl the differential of the spiral length. 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.

IfcCurve (1)
* Dim IfcDimensionCount

This attribute is formally derived.


The space dimensionality of this abstract class, defined differently for all subtypes, i.e. for IfcLine, IfcConic and IfcBoundedCurve.

Click to show 3 hidden inherited attributes Click to hide 3 inherited attributes
IfcSpiral (1)
1 Position IfcAxis2Placement

No description available.

Table Formal representation

ENTITY IfcSpiral
 SUBTYPE OF (IfcCurve);
	Position : IfcAxis2Placement;
END_ENTITY; References

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Is this page difficult to understand? Let us know! Changelog IFC4.3_DEV_0078979

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