Define a comparison set for reference model change detection
Change detection in Tekla Structures compares different versions of the reference model based on a comparison set, which tells you whether Tekla Structures considers a change in a property a change or not. You can use the standard property comparison set, or define a comparison set of your own.
In the reference model, when change detection is active, the changes list shows all deleted, changed, new and not changed objects. The property details list only contains those properties that are defined by the current comparison set rules to be compared.
When you save a comparison file, both the standard file and a customized comparison set file are saved to the \attributes folder under model folder. The standard file can only be removed from model folder if it exists in another location. If saving or removing the standard file is not successful, you will get an error message.
Create a new comparison set
Properties in comparison set
- Free property set properties, such as BaseQuantities.NetVolume
- Fixed properties that always exist in the comparison set file, but can be excluded from the comparison
The fixed properties are listed below:
Property type | Description |
---|---|
Geometry | Object dimensions |
Location | The coordinates of the object in the model |
Rotation | The rotation coordinates of the object |
Material | Material name and grade |
Profile | Profile name |
Product |
IfcProduct parameters that vary object type by type. Some properties are optional. Below examples of product properties for IfcColumn: Application full name Application identifier Change action Creation date Description Family name Given name Is set last modified date Last modified date Middle names Name Object type Organization description Organization names Organization roles Roles State Version |
Common attributes |
Below examples of common attributes for IfcColumn: External Use Fire Rating Load bearing Reference COLUMNTYPE->GUID GUID |
Property sets |
Whatever has been added to IFC properties. Below examples of property set properties for IfcColumn: BaseQuantities.Length [mm] BaseQuantities.NetWeight [kg] BaseQuantities.NetVolume [mm³] BaseQuantities.OuterSurfaceArea [m²] Tekla Common.Bottom elevation Tekla Common.Class Tekla Common.Phase Tekla Common.Preliminary mark Tekla Common.Top elevation Tekla Quantity.Area per tons [m²] Tekla Quantity.Gross footprint area [m²] Tekla Quantity.Height [mm] Tekla Quantity.Length [mm] Tekla Quantity.Net surface area [m²] Tekla Quantity.Weight [kg] Tekla Quantity.Width [mm] Tekla Quantity.Volume [mm³] |
Define property comparison tolerances
In reference model version comparison, you can modify the property comparison tolerance settings to get relevant changes more easily. You need two versions from the same IFC model.
The changed row appears as light yellow if the tolerance is bigger than the difference.