IFC 4.3.0.0 (IFC4X3) final

4.7.1.2.3 Clothoid Transition Segment

A clothoid segment is based on the IfcClothoid where the value for the clothoid constant is specified as 鈭歀 and L is the length measured from the inflection point.

The following diagram shows the generic classes and relationships used when applying this concept.

G IfcCurveSegment IfcCurveSegment LayerAssignment [0:1] StyledByItem [0:1] Transition [1:1] UsingCurves [1:?] Placement [1:1] SegmentStart [1:1] SegmentLength [1:1] ParentCurve [1:1] IfcClothoid IfcClothoid LayerAssignment [0:1] StyledByItem [0:1] Position [0:1] ClothoidConstant [1:1] IfcCurveSegment:ParentCurve1->IfcClothoid:IfcClothoid0 IfcParameterValue_0 IfcParameterValue IfcCurveSegment:SegmentStart1->IfcParameterValue_0:IfcParameterValue0 IfcParameterValue_1 IfcParameterValue IfcCurveSegment:SegmentLength1->IfcParameterValue_1:IfcParameterValue0 IfcLengthMeasure IfcLengthMeasure IfcClothoid:ClothoidConstant1->IfcLengthMeasure:IfcLengthMeasure0
Figure 4.7.1.2.3.A