IFC (IFC4X3) development Clothoid Transition Segment

A clothoid segment is based on the IfcClothoid where the value for the clothoid constant is specified as √L 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] 1. Transition [1:1]      UsingCurves [1:?] 2. Placement [1:1] 3. SegmentStart [1:1] 4. SegmentLength [1:1] 5. ParentCurve [1:1] IfcClothoid IfcClothoid      LayerAssignment [0:1]      StyledByItem [0:1] 1. Position [0:1] 2. 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

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