CV-2x3-155 (aka CV-06-155)

Agreement on implementation of first level space boundaries 

Based on          IFC2x3

Initiator            ISG Meeting-Amsterdam

Effects              Extended Coordination View

Date                    2008 06 24

Description:

 In addition to CV-2x3-151 the following agreements are made for creating "1stLevel" space boundaries.

Creation of space boundaries based on element type:

    * Building elements, one space boundary (type .physical.) is created for each surface to the adjacent space,

    * No inner loops to be created for openings in the building element

    * Doors and windows, one space boundary (type .physical.) is created

    * The space boundary is not cut out of the wall space boundary (see above), so wall and door/window space boundary are overlapping. The opening element into which the door/window is inserted is not considered (shall not have an own space boundary)

    * Openings that are not filled with door/window, one space boundary (type .virtual.) is created

    * The space boundary is not cut out of the wall space boundary (see above), so wall and opening space boundary are overlapping.

             - NOTE: It currently violates WR1 at IfcRelSpaceBoundary, it is an accepted exception (and will be fixed in next IFC version)

Geometry type of the IfcRelSapceBoundary.ConnectionGeometry

    * for straight walls - IfcSurfaceOfLinearExtrusion or IfcCurveBoundedPlane

    * for round walls

           - prismatic - IfcSurfaceOfLinearExtrusion

           - under a sloped roof - IfcFaceBasedSurfaceModel 


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