Definition from IAI: Abstract supertype for the special types
defining the object coordinate system. The IfcObjectPlacement has to be
provided for each product that has a shape representation.
The object placement can be given:
- absolute, i.e. by an axis2 placement, relative to the world
- relative, i.e. by an axis2 placement, relative to the object
placement of another product,
- by grid reference, i.e. by the virtual intersection and reference
direction given by two axes of a design grid.
In any case the object placement has to unambiguously define the object
coordinate system as either two-dimensional axis placement
(IfcAxis2Placement2D) or three-dimensional axis placement
(IfcAxis2Placement3D). The axis placement may have to be calculated.
HISTORY New entity in IFC Release
ISSUE See issue log for changes made in IFC Release 2.x.
|| Placements that are given relative to this placement of an object.