Figure 15 — Sine Spiral Transition Segment
The sine transition segment is a special case of a spiral where the curvature rate of change is a sine function and the terms are dependent on the length L measured from the inflection point. The parameter value is defined as the deflection i.e. bearing angle &Theta.
The values of its individual terms are identical and equal to the lenght of the segment L: SineTerm = L LinearTerm = L
Figure 15 illustrates an instance diagram.
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Figure 15 — Sine Spiral Transition Segment |
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<Rules>
<AttributeRule AttributeName="ParentCurve">
<EntityRules>
<EntityRule EntityName="IfcSineSpiral">
<AttributeRules>
<AttributeRule AttributeName="SineTerm">
<EntityRules>
<EntityRule EntityName="IfcLengthMeasure" />
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<AttributeRule AttributeName="LinearTerm">
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<AttributeRule AttributeName="SegmentStart">
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<AttributeRule AttributeName="SegmentLength">
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<EntityRule EntityName="IfcParameterValue" />
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