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Define a comparison set for reference model change detection

Last updated September 6, 2017 by Tekla User Assistance tekla.documentation@trimble.com

Software version: 
2017i

Define a comparison set for reference model change detection

Define a comparison set for reference model change detection

Change detection in Tekla Structures compares different versions of the reference modelmodel which the designer can use as an aid when building another model

A reference model is created in Tekla Structures or in other software and can be inserted to Tekla Structures. The reference model appears together with the model but it is not modified by Tekla Structures. The user can snap to reference model points.

For example, an architectural model, a plant design model, or a heating, ventilating, and air-conditioning (HVAC) model can be a reference model.

based on a comparison setset of object properties that are used for detecting changes in reference models

Tekla Structures compares different versions of the reference model based on a comparison set, which tells if a change in a property is considered a change.

, 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 folderfolder that is used for storing files associated with a model

Tekla Structures stores all files associated with a model in a folder it creates with the same name as the model database (.db1).

In multi-user mode all users access the same model folder.

. The standard file can only be removed from model folder if it exists in another other location. If saving or removing the standard fileproperty file that Tekla Structures uses by default

Standard files are used, for example, for loading frequently used values into the property pane or a dialog box.

Standard file name is standard.* where the symbol * is the file name extension. For example, standard.clm file is used for column properties.

is not successful, you will get an error message.

Create a new comparison set

  1. In Change detection , click the Comparison sets button ... to open the Comparison sets dialog box.
  2. Enter a name for the comparison set.

  3. Add a new comparison rule by clicking the Add row button and typing or copying and pasting the property name.
    • You can copy and paste property names directly from the property details list in change detection.
    • To include more properties within one rule, use asterisk (*), for example:

      X* (all that starts with X)

      *X (all that ends with X)

    • If you want to compare only one property set property, clear the Property sets check box and create a separate rule for that property. If you want to compare all property sets but not one property, select the Property sets check box and create rule for that property and leave its check box empty.
    • Note that comparison rules are case insensitive.
    • All rules in comparison set affect the comparison if the reference model version has a corresponding property.

  4. Add more rules in the same way as in step 2 and 3.
  5. To delete a rule, select the rule and click the Delete rule button. You cannot delete fixed comparison rules, like Geometry , Location , Rotation , Materials , Profiles , Products , Common attributes or Property sets , but you can exclude those from comparison by leaving the check boxes next to them empty.
  6. Ensure that you have the check box selected next to all the comparison rules you want to include in the comparison set. If you do not want to include a rule, clear the check box.

  7. Click the Save button.
  8. Close the comparison set dialog box by clicking the Close button. If you have not saved your changes, you will be asked if you want to keep the changes when you close the dialog box.
  9. Click the Update view button.

Properties in comparison property set

A comparison set may contain the following types of properties:
  • 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]

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