A bounded portion of the surface of a right circular cone.
CYLINDRICAL_SURF
A bounded portion of a cylindrical surface.
GENERALISED_CONE
A special case of a ruled surface in which the second curve degenerates to a
single point; when represented by a B-spline surface all the control points along one edge will be coincident.
PLANE_SURF
A bounded portion of a plane represented by a B-spline surface of degree 1 in each parameter.
QUADRIC_SURF
A bounded portion of one of the class of surfaces of degree 2 in the variables x, y and z.
RULED_SURF
A surface constructed from two parametric curves by joining with straight lines
corresponding points with the same parameter value on each of the curves.
SPHERICAL_SURF
A bounded portion of a sphere, or a complete sphere, represented by a B-spline surface.
SURF_OF_LINEAR_EXTRUSION
A bounded portion of a surface of linear extrusion represented by a B-spline surface of degree 1 in one of the parameters.
SURF_OF_REVOLUTION
A bounded portion of a surface of revolution.
TOROIDAL_SURF
A torus, or portion of a torus, represented by a B-spline surface.
UNSPECIFIED
A surface for which no particular form is specified.
Table 8.9.2.4.A
8.9.2.4.3 Formal representation
TYPE IfcBSplineSurfaceForm = ENUMERATION OF
(CONICAL_SURF
,CYLINDRICAL_SURF
,GENERALISED_CONE
,PLANE_SURF
,QUADRIC_SURF
,RULED_SURF
,SPHERICAL_SURF
,SURF_OF_LINEAR_EXTRUSION
,SURF_OF_REVOLUTION
,TOROIDAL_SURF
,UNSPECIFIED);
END_TYPE;