4.1.2.1.1 Gradient Curve

Curve geometry based on a 2D horizontal projection as an IfcCompositeCurve referencing IfcCurveSegment occurrences. The vertical profile is represented by another independent list of IfcCurveSegment occurrences.

Figure 6 illustrates an instance diagram.

Gradient CurveIfcGradientCurveIfcCurveSegmentArc SegmentClothoid Transition SegmentLinear SegmentParabolic Transition SegmentIfcCompositeCurveIfcCurveSegmentArc SegmentBloss Transition SegmentClothoid Transition SegmentCosine Spiral Transition SegmentCubic Transition SegmentHelmert Transition SegmentLinear SegmentSine Spiral Transition SegmentViennese Bend Transition Segment

Figure 6 — Gradient Curve

mvdXML Specification
<?xml version="1.0" encoding="utf-8"?>
<ConceptTemplate xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" uuid="cf0d4709-dc5b-484e-ae24-946553d6a4e1" name="Gradient Curve" applicableSchema="IFC4" applicableEntity="IfcGradientCurve">
  <Rules>
    <AttributeRule AttributeName="BaseCurve">
      <EntityRules>
        <EntityRule EntityName="IfcCompositeCurve">
          <AttributeRules>
            <AttributeRule RuleID="CompositeSegments" AttributeName="Segments">
              <EntityRules>
                <EntityRule EntityName="IfcCurveSegment">
                  <References>
                    <Template ref="0a3d3dd9-f726-42f4-ab52-250f4c89b546" />
                  </References>
                </EntityRule>
              </EntityRules>
            </AttributeRule>
          </AttributeRules>
        </EntityRule>
      </EntityRules>
    </AttributeRule>
    <AttributeRule RuleID="VerticalSegments" AttributeName="Segments">
      <EntityRules>
        <EntityRule EntityName="IfcCurveSegment">
          <References>
            <Template ref="0a3d3dd9-f726-42f4-ab52-250f4c89b546" />
          </References>
        </EntityRule>
      </EntityRules>
    </AttributeRule>
  </Rules>
</ConceptTemplate>

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