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#CV-2x3-135

assignment of surface color to surface models (dealing with the backface issue)
number
CV-06-135
based on
IFC2x3
effects
extended coordination view
date
13. Mar 2007
initiator
ISG meeting in Waltham
summary assignment of surface color to surface models (dealing with the backface issue)

 

Description

Surface model maybe based on open or closed shells. If backfaces should not be shown differently then the frontface (and in an open shell there is no front and back), the surface style should be assigned as applying to both faces.

This is handled by

  • IfcSurfaceStyle.Side = .BOTH.

 

It would be wrong and excluded from certification to export the face twice, i.e. with a normal to point in both directions.