IfcAxis2Placement3D
Location
IfcCartesianPoint
Coordinates
Axis
IfcDirection
DirectionRatios
RefDirection
IfcDirection
DirectionRatios
The concept of '3D placement' defines a 3 dimensional placement for geometry. In effect this is the definition of a new LCS (local coordinate system) that is relative to another LCS (parent LCS). The parent LCS is not specified in the '3D placement', but it is specified implicitly by the context in which the '3D placement' is used. If '3D placement' is used e.g. from local placement, then the 'PlacementRelTo' defines the object with the parent LCS. If the '3D placement' is used in e.g. an extruded solid, then the parent LCS is the LCS of the object that uses the geometry.
'3D placement' defines a 3D offset (X, Y and Z) and the directions of the X and Z-axis. The direction of the Y axis is derived. If the coordinate directions are not turned the X and Z-axis may be omitted. If either axis is turned then both directions have to be given.
Used by views
- This concept is used by all views.
IfcAxis2Placement3D
Used by concepts
Clipping half space
Copyright © 2000-2002 BLIS-Project [BLIS, Registered Organization]
Author: Jiri Hietanen (jiri.hietanen@qpartner.com)
All rights reserved.