The parameterization is as follows where the curve has a parameterization λ(u):
C = AxisPosition.Location
V = AxisPosition.Z
In order to produce a single-valued surface with a complete revolution, the curve shall be such that when expressed in a cylindrical coordinate system (r,φ ,z) centred at C with an axis V, no two distinct parametric points on the curve shall have the same values for (r, z). For a surface of revolution the parametric range is 0 < u < 360 degree. The parameterization range for v is defined by referenced curve.Figure 8.9.3.70.A
Informal Propositions
The surface shall not self-intersect
The swept curve shall not be coincident with the axis line for any finite part of its length.
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.
Position coordinate system for the swept surface, provided by a profile definition within the XY plane of the Position coordinates. If not provided, the position of the profile being swept is determined by the object coordinate system. In this case, the swept surface is not repositioned.
Click to show 5 hidden inherited attributes
Click to hide 5 inherited attributes