IfcEllipseProfileDef
Definition
from IAI: The IfcEllipseProfileDef
defines
an ellipse as the profile definition used by the swept surface geometry
or the swept area solid. It is given by its semi axis attributes and
placed within the 2D position coordinate system, established by the Position
attribute.
HISTORY: New entity
in IFC
Release 2x
Illustration:
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Position
The parameterized profile defines its own position coordinate system.
The underlying
coordinate system is defined by the swept surface or swept area solid
that uses the profile definition. It is the xy plane of either:
- IfcSweptSurface.Position
- IfcSweptAreaSolid.Position
or in case of sectioned spines the xy plane of each list member of IfcSectionedSpine.CrossSectionPositions.
By using offsets of the position location, the parameterized profile
can be positioned centric (using x,y offsets = 0.), or at any position
relative to the profile. Explicit coordinate offsets are used to define
cardinal points (e.g. upper-left bound).
Parameter
The location of the position coordinate system defines the center of
the ellipse. The SemiAxis1
attribute defines the first radius
of the ellipse in the direction of the x axis, the SemiAxis2
attribute defines the second radius of the ellipse in the direction of
the y axis.
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Table: Parameter for ellipse
profile definition
NOTE: The semi axes of the ellipse are
rectangular to each other by definition.
EXPRESS specification:
Attribute definitions:
| SemiAxis1
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The first radius of the ellipse. It is measured along the direction of Position.P[1].
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| SemiAxis2
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The second radius of the ellipse. It is measured along the direction of Position.P[2].
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Inheritance graph
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| ENTITY IfcEllipseProfileDef;
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