Converting IFC to gbXML
From Wiki.OSArch
//* Note to Editors: Just putting resources here to reference when eventually creating this page:*//
The IFC to gbXML converter tool (python scripts) supports IFC2x3 and IFC4 in SI units.
- OSArch Forum post on IFC to gbXML conversion.
Converting IFC to gbXML/Required data in IFC file for Conversion[edit]
- Each Site should have location attributes, ie. RefLatitude, RefLongitude, RefElevation and SiteAddress. RefLatitude must be correct.
- Each Building should have a BuildingAddress.
- Spatial Elements must be structured correctly, ie. a Space must be contained within a Building Storey, which must be contained within a Building, which must be contained within a Site.
- Each Space should have Qto_SpaceBaseQuantities/NetFloorArea and Qto_SpaceBaseQuantities/NetVolume quantities.
- Each Space must be bounded by 2nd Level Space Boundary relationships.
- Each Space Boundary must have a Related Building Element, planar Connection Geometry, and an Internal Or External Boundary attribute.
- Each Window and Door (or its Type) must have a U-value property in Pset_WindowCommon/ThermalTransmittance or Pset_DoorCommon/ThermalTransmittance.
- Each Window and Door (or its Type) should have a transmittance property in Pset_WindowCommon/GlazingAreaFraction or Pset_DoorCommon/GlazingAreaFraction.
- Each Building Element (or its Type) with a solid construction must have a U-value property (eg. Pset_WallCommon/ThermalTransmittance) or be constructed from a Material Layer Set with full thermal properties.
- Each Material Layer in a Material Layer Set construction must have a Thickness attribute, and each Material in a Material Layer must have an R-value property in Pset_MaterialEnergy/ThermalConductivityTemperatureDerivative.
- For metric projects, units for U-Values must be W/m²·K, and R-values must be m²·K/W. For imperial projects (ie. where the LENGTHUNIT is feet or inches), U-value units must be Btu/h·ft²·F, and R-values must be h·ft²·F/Btu.
