Editing Revit setup for OpenBIM/Revit IFC spatial hierarchy

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{{Autodesk_Revit}}
 
 
== IfcSite ==
 
== IfcSite ==
  
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== IfcBuildingStorey ==
 
== IfcBuildingStorey ==
  
<code>IfcBuildingStorey</code> elements are generated for each Revit level which has the checkbox <code>Building Storey</code> checked in properties. The following attributes can be set:
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<code>IfcBuildingStorey</code> elements are generated for each Revit level. The following attributes can be set:
  
 
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| <code>PredefinedType</code>
 
| <code>PredefinedType</code>
 
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| This defaults to <code>INTERNAL</code> with IFC2x3 and <code>SPACE</code> with IFC4. It is not possible to override this.
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| This defaults to <code>INTERNAL</code>. It is not possible to override this.
 
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| <code>ElevationWithFlooring</code>
 
| <code>ElevationWithFlooring</code>
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== IfcZone ==
 
== IfcZone ==
  
The Revit <code>HVAC Zone</code> object translates into IFC <code>IfcZone</code> entities. In addition, it is also possible to group Revit <code>Room</code> objects into <code>IfcZone</code> entities. To do this, create a new <code>ZoneName</code> instance parameter assigned to a Revit <code>Room</code> object. For each unique string supplied in this parameter, an <code>IfcZone</code> entity will be created.<ref>IFC for Revit wiki - Exporting Zones</ref>
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The Revit <code>HVAC Zone</code> object translates into IFC <code>IfcZone</code> entities. In addition, it is also possible to group Revit <code>Room</code> objects into <code>IfcZone</code> entities. To do this, create a new <code>ZoneName</code> instance parameter assigned to a Revit <code>Room</code> object. For each unique string supplied in this parameter, an <code>IfcZone</code> entity will be created.
  
 
{{warning|Virtual <code>IfcZones</code> created by grouping multiple Revit <code>Room</code> objects will not maintain their <code>GlobalId</code> values on subsequent exports. Additionally, if two <code>ZoneName</code> parameters have the same value, but their other attributes, such as <code>ZoneDescription</code> are different, then only one will be exported, and the rest of the data will be lost. It is not clear to the user which will be retained and which will be lost, so care must be taken to manually ensure data consistency between all these fields.}}
 
{{warning|Virtual <code>IfcZones</code> created by grouping multiple Revit <code>Room</code> objects will not maintain their <code>GlobalId</code> values on subsequent exports. Additionally, if two <code>ZoneName</code> parameters have the same value, but their other attributes, such as <code>ZoneDescription</code> are different, then only one will be exported, and the rest of the data will be lost. It is not clear to the user which will be retained and which will be lost, so care must be taken to manually ensure data consistency between all these fields.}}
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| Create a new <code>ZoneLongName</code> instance parameter, assigned to the <code>Room</code> object.
 
| Create a new <code>ZoneLongName</code> instance parameter, assigned to the <code>Room</code> object.
 
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|}
Resources :
 
* [https://sourceforge.net/p/ifcexporter/wiki/Exporting%20Zones/ IFC for Revit wiki - Exporting Zones]
 
* [https://www.bim42.com/2018/03/ifc-for-revit-1/#ifczones bim42 IFC from Revit - Part 1]
 
  
==Element placement in Spatial Container==
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[[Category:Revit]]
Most elements in Revit will on export be assigned to an IfcBuildingStorey based on the value of parameters like <code>Base Level</code> for columns, <code>Base Constraint</code> for walls, <code>Level</code> for floors and <code>Reference Level</code> for beams. For Face Based families the parameter <code>Schedule Level</code> is used, which has to be set manually and is often forgotten.
 
 
 
It is possible to override the spatial container of an element by adding an instance parameter <code>IfcSpatialContainer</code>
 
 
 
The valid values are:
 
* <code>IfcSite</code> - for assigning objects to IfcSite, useful for objects outside the building
 
* <code>IfcBuilding</code> – for assigning objects to IfcBuilding
 
* <code>name of the level</code> - for assignment to a specific IfcBuildingStorey (= Level in Revit). Please note that the Level must be checked for export as Building Story
 
 
 
[[Category:Autodesk Revit]]
 

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