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.

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