IfcSurfaceSide

Definition from IAI: Denotion of whether negative, positive or both sides of a surface are being referenced.

ENUMERATION Definition from ISO/CD 10303-46:1992:

POSITIVE: The side of a surface which is in the same direction as the surface normal derived from the mathematical definition.
NEGATIVE: The side of a surface which is in the opposite direction than the surface normal derived from the mathematical definition.
BOTH: Both, positive and negative side.

NOTE Corresponding STEP type: surface_side. Please refer to ISO/IS 10303-46:1994 for the final definition of the formal standard.

HISTORY: New Enumeration in IFC Release 2.0

EXPRESS specification:

TYPE IfcSurfaceSide = ENUMERATION OF

(	POSITIVE, NEGATIVE, BOTH);

END_TYPE;