Definition from ISO/CD 10303-42:1992: The curve bounded surface
is a parametric surface with curved boundaries defined by one or more boundary
curves. The bounded surface is defined to be the portion of the basis surface
in the direction of N x T from any point on the boundary, where N is the
surface normal and T the boundary curve tangent vector at this point. The
region so defined shall be arcwise connected.
Definition from IAI: The IfcCurveBoundedPlane is a specialized
bounded surface class that deals only with bounding basis plane surfaces. The
definition varies from STEP as outer and inner boundaries are separated
attributes and reference the special IFC type Ifc2DCompositeCurve. Only basis
surfaces of type IfcPlane are allowed, and the implicit_outer attribute has not
been incorporated, since only unbounded surfaces are used as basis surface.
NOTE After the enhancement of the
profile definition capacities in IFC Release 2.x this entity is not needed
anymore for the definition of boundaries on a plane for the purpose of swept
area solids. Therefore this entity is marked as depreciated - that means it
will not be supported in future versions of IFC.
NOTE Corresponding STEP entity
curve_bounded_surface has been changed to meet the specific requirements of an
easy representation of curve bounded planes.
HISTORY New class in IFC Release 1.5
ISSUE: See issue log for changes made in IFC Release 1.5.1
