Difference between revisions of "Revit setup for OpenBIM/Revit IFC spatial hierarchy"
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Revision as of 21:01, 10 August 2020
IfcSite
The following attributes may be set on the IfcSite
. If you have a Toposurface
object overriding your IfcSite
object representation as detailed in Revit geolocation, the procedure is slightly different. Do not implement both procedures simultaneously. Note that in Revit, only a single IfcSite
may exist. It is not possible to create multiple sites.
Attribute Name | Required | Procedure with Toposurface
|
Procedure without Toposurface
|
---|---|---|---|
Name
|
Yes | Create a new IfcName instance parameter, assigned to the Toposurface object.
|
Create a new SiteName instance parameter, assigned to the Project Information object.
|
Description
|
Create a new IfcDescription instance parameter, assigned to the Toposurface object.
|
Create a new SiteDescription instance parameter, assigned to the Project Information object.
| |
ObjectType
|
Create a new IfcObjectType instance parameter, assigned to the Toposurface object.
|
Create a new SiteObjectType instance parameter, assigned to the Project Information object.
| |
LongName
|
Yes | Create a new IfcLongName instance parameter, assigned to the Toposurface object.
|
Create a new SiteLongName instance parameter, assigned to the Project Information object.
|
LandTitleNumber
|
Yes | Create a new IfcLandTitleNumber instance parameter, assigned to the Toposurface object.
|
Create a new SiteLandTitleNumber instance parameter, assigned to the Project Information object.
|
SiteAddress
|
This may be set via File > Export > IFC > Modify setup > General > Project Address and checking Assign address to site .
|
Same procedure as with Toposurface .
|
IfcBuilding
The following attributes may be set on the IfcBuilding
. Note that in Revit, only a single IfcBuilding
may exist. It is not possible to create multiple buildings.
Attribute Name | Required | Procedure |
---|---|---|
Name
|
Yes | Fill out the Building Name field in the Project Information dialog.
|
Description
|
Create a new BuildingDescription instance parameter, assigned to the Project Information object.
| |
ObjectType
|
Create a new BuildingObjectType instance parameter, assigned to the Project Information object.
| |
LongName
|
Yes | Create a new BuildingLongName instance parameter, assigned to the Project Information object.
|
ElevationOfRefHeight
|
Does not seem possible to change this value. Defaults to null. | |
ElevationOfTerrain
|
Does not seem possible to change this value. Defaults to null. | |
BuildingAddress
|
This may be set via File > Export > IFC > Modify setup > General > Project Address and checking Assign address to building .
|
An example of the building address settings to be provided is shown below.
Note that if you fill out address details in File > Export > IFC > Modify setup > General > Project Address
, then that address will be exported twice in your IFC: once for the site and another for the building. This behaviour cannot be changed. Even unchecking Assign address to building/site
will not remove this information, but only remove the link between the address and the building/site.
IfcBuildingStorey
IfcBuildingStorey
elements are generated for each Revit level. The following attributes can be set:
Attribute Name | Required | Procedure |
---|---|---|
Name
|
Yes | This defaults to the Name parameter in the Identity Data parameter group. This is usually incorrect, as IFC names are usually short codes, not long descriptions. You can override this by creating a new IfcName instance parameter.
|
Description
|
Create a new IfcDescription instance parameter.
| |
ObjectType
|
Create a new IfcObjectType instance parameter.
| |
LongName
|
Yes | Create a new IfcLongName instance parameter. This should typically contain the same value as the Name parameter in the Identity Data parameter group.
|
CompositionType
|
This is asserted by default to ELEMENT . It is not possible to override this. It is not possible to nest spatial structures in Revit.
| |
Elevation
|
This is automatically derived from the Elevation parameter in the Constraints parameter group. Although not obviously wrong, this does not match the current intention by buildingSMART. This is fundamentally broken in Revit.
|
IfcSpace
In Revit, there are Room
objects, Space
objects. Both of these objects translate into IfcSpace
entities. Revit Area
objects do not translate into IFC and are lost.
If you are exporting from a 3D view which has filters to turn certain objects on and off, you may have enabled the Export only elements visible in view
option in File > Export > IFC > Modify Setup > Additional Content
. If this is enabled, you must enable the Export rooms in 3D views
option, or IfcSpace
entities will not be created in your IFC file. Despite the use of the word "rooms", the option applies to both Revit Room
and Space
objects.
The following attributes may be set:
Attribute Name | Required | Procedure |
---|---|---|
Name
|
Yes | This defaults to the Number parameter in the Identity Data parameter group. You can override this by creating a new IfcName instance parameter.
|
Description
|
Create a new IfcDescription instance parameter.
| |
ObjectType
|
Create a new IfcObjectType instance parameter.
| |
LongName
|
Yes | This defaults to the Name parameter in the Identity Data parameter group. You can override this by creating a new IfcLongName instance parameter.
|
CompositionType
|
This is asserted by default to ELEMENT . It is not possible to override this. It is not possible to nest spatial structures in Revit.
| |
PredefinedType
|
This defaults to INTERNAL . It is not possible to override this.
| |
ElevationWithFlooring
|
This is null by default. Create a new IfcElevationWithFlooring instance parameter.
|
IfcZone
The Revit HVAC Zone
object translates into IFC IfcZone
entities. In addition, it is also possible to group Revit Room
objects into IfcZone
entities. To do this, create a new ZoneName
instance parameter assigned to a Revit Room
object. For each unique string supplied in this parameter, an IfcZone
entity will be created.
The following attributes may be set:
Attribute Name | Required | Procedure with Revit HVAC Zone
|
Procedure with virtual zone from Revit Room
|
---|---|---|---|
Name
|
Yes | This defaults to the Name parameter in the Identity Data parameter group, concatenated with the Revit Element ID . This concatenation usually results in an undesirable value. You can override this by creating a new IfcName instance parameter.
|
Create a new ZoneName instance parameter, assigned to the Room object.
|
Description
|
Create a new IfcDescription instance parameter, assigned to the HVAC Zone object.
|
Create a new ZoneDescription instance parameter, assigned to the Room object.
| |
ObjectType
|
Create a new IfcObjectType instance parameter, assigned to the HVAC Zone object.
|
Create a new ZoneObjectType instance parameter, assigned to the Room object.
| |
LongName
|
Yes | Create a new IfcLongName instance parameter, assigned to the HVAC Zone object.
|
Create a new ZoneLongName instance parameter, assigned to the Room object.
|