The cylindrical surface is a surface unbounded in the direction of z. Bounded cylindrical surfaces are defined by using a subtype of IfcBoundedSurface with BasisSurface being a cylindrical surface.
The inherited attributes are interpreted as
SELF\IfcElementarySurface.Position defines the location and orientation of the cylindrical surface.
SELF\IfcElementarySurface.Position.Location defines a point on the axis of the cylindrical surface.
SELF\IfcElementarySurface.Position.P[3] defines the direction of the axis of the cylindrical surface.
{ .extDef}
C = Position.Location
x = Position.P[1]
y = Position.P[2]
z = Position.P[3]
R = Radius
and the surface is parameterized as:
where the parametric range is -∞ < u,v < ∞ .Figure A
In the above parameterization the length unit for the unit vectors z is equal to that of the radius R. In the placement coordinate system defined above, the surface is represented by the equation S = 0, where
The positive direction of the normal to the surface at any point on the surface is given byFigure B, or as unit normal byFigure CFigure D
The direction of the normal is away from the axis of the cylinder.
Assignment of the representation item to a single or multiple layer(s). The LayerAssignments can override a LayerAssignments of the IfcRepresentation it is used within the list of Items.
Reference to the IfcStyledItem that provides presentation information to the representation, e.g. a curve style, including colour and thickness to a geometric curve.
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Last change: Improve definition split (#876)
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Because bringing back headers required to go back in time to previous version, I'm now re-resolving the issues: #861, #860, #856 by ArturTomczak on 2024-07-16T16:07:28+02:00
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where the parametric range is -∞ < u,v < ∞ .
The positive direction of the normal to the surface at any point on the surface is given by
, or as unit normal by
