Restrictions on the 'Axis' shape representation for IfcWallStandardCase
Based on IFC2x3
Initiator ISG Certification Teleconference
Effects Coordination View 2.0
Date 2012 02 01
The 'Axis' shape representation of an IfcWallStandardCase shall be restricted to:
* The axis shall be at the base of the extrusion body of the IfcWallStandardCase
* The axis is positioned by the object (local) placement of the IfcWallStandardCase (and not by the position coordinate system of the extrusion body)
* The axis shall be parallel to the x-axis of the object (local) placement for straight walls, or the tangent of the Axis at the start point shall be parallel to the object (local) placement for round walls
* The direction of the axis (or the direction of the tangent of the axis) shall be in the direction of the positive x-axis.
In most cases (but not necessarily) the Axis is collinear to the x-axis. The IFC import interfaces shall however also handle a wall axis that is parallel (with offset) to the x-axis of the object (local) placement.