IFC 4.3.0.1 (IFC4X3) development

# 8.9.3.21 IfcCompositeCurveOnSurface

## 8.9.3.21.1 Semantic definition

The IfcCompositeCurveOnSurface is a collection of segments, based on p-curves. i.e. a curve which lies on the basis of a surface and is defined in the parameter space of that surface. The p-curve segment is a special type of a composite curve segment and shall only be used to bound a surface.

## 8.9.3.21.5 Formal representation

ENTITY IfcCompositeCurveOnSurface
SUPERTYPE OF (ONEOF
(IfcBoundaryCurve))
SUBTYPE OF (IfcCompositeCurve);
DERIVE
BasisSurface : SET [0:1] OF IfcSurface := IfcGetBasisSurface(SELF);
WHERE
SameSurface : SIZEOF(BasisSurface) > 0;
END_ENTITY;

## 8.9.3.21.6 References

Is this page difficult to understand? Let us know!

• New resource