Composite curve

Definition

The vocabulary of a composite curve contains 3 elements

• Straight segment
• Arc (part of a circle)
• Elliptical arc (part of an ellipse)

These elements are 'chained' together to form the arbitrary profile. Splines, nurbs and other more advanced paths are not supported. These have to be approximated to use the 3 elements supported by IFCs.

Used by views

• Arch. design >> Quantities take off
• Arch. design >> Thermal load calculations / HVAC system design
• HVAC system design >> Quantities take off
• CAD / visualization

Data structure

IfcCompositeCurve
Segments
IfcCompositeCurveSegment
Transition
IfcTransitionCode
Continuous
SameSense
ParentCurve
IfcTrimmedCurve
BasisCurve
Circle [1,3,5]
Ellipse [1,3,5]
Trim1
IfcCartesianPoint
Coordinates
Trim2
IfcCartesianPoint
Coordinates
SenseAgreement
MasterRepresentation
Polyline [all]
SelfIntersect

Uses concepts

Circle [1,3,5]
Ellipse [1,3,5]
Polyline [all]

Used by concepts

2D geometry
Profile: curved

Copyright © 2000-2002 BLIS-Project [BLIS, Registered Organization]
Author: Jiri Hietanen (jiri@blis-project.org)
All rights reserved.