Improved reference model clash check

Added May 4, 2021 by Tekla User Assistance

Software version: 

Improved reference model clash check

Improved reference model clash check

Clash check manager has been improved to better and faster find clashes in reference models.

New settings for selecting object types

In the Clash Check Manager dialog box, you can now easily control what type of objects are included in the clash check. You can select whether the clash check includes clashes between reference models, clashing objects in reference models, and clashing Tekla Structures objects. You can also define a minimum distance for reporting clashes between 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.


The settings you select in the Clash Check Manager dialog box determine what is included in the clash check. The settings have related advanced optionssettings used to customize Tekla Structures for specific companies, standards, users, or user groups

In Tekla Structures, advanced options are settings that are used, for example, in a specific project or geographical area, or by a specific company.

In Tekla Structures, advanced options usually begin with the initials XS and are followed by the name of the function, for example XS_BACKGROUND_COLOR.

whose values are not changed when you select or clear the check boxes of the settings. When you open a new model or restart Tekla Structures, the settings are reset to match the advanced option values. The advanced options are already available in previous Tekla Structures versions.

  • Between reference models

    Clashes between reference models are included in the clash check.

    Related advanced option: XS_CLASH_CHECK_BETWEEN_REFERENCES.

  • Objects in reference models

    Clashes within reference models are included in the clash check (bolts and welds are not included).

    Related advanced option: XS_CLASH_CHECK_INSIDE_REFERENCE_MODELS.

  • Minimum distance (mm)

    Reference model objects that are closer to each other than the set minimum distance are reported in the clash check list. The highest possible minimum distance is 500 mm.

    For example, you can use the minimum distance to detect the reference model piping clearanceset space between objects

    In bolted connections, clearance is required for entering and tightening the bolts with an impact wrench. In addition to this, there may be a clearance for a fillet.

    In welded connections, clearances are required in order to allow a welder to lay a correct weld.

    Reinforcing bar clearance defines the minimum clearance or the allowed overlap for reinforcing bars when they are checked against other objects.

    from structures to ensure the needed space requirement for piping insulation or supports.

  • Between parts

    Clashes between Tekla Structures objects are included in the clash check.

    Related advanced option: XS_CLASH_CHECK_BETWEEN_PARTS.

If you already have clashes listed in Clash Check Manager, selecting or clearing any check box of the new settings will start a new clash check session. Tekla Structures displays a dialog box asking whether you want to save your current clash check session.

New progress bars

Clash Check Manager now shows separate progress bars for checking clashes and for adding the clashes to the list of clashes in Clash Check Manager.

  • When you start the clash check, Tekla Structures opens a dialog box that shows a progress bar for the clash check: first for native Tekla Structures objects and then for reference model objects and pours. You can cancel the clash check in the progress bar dialog box, if needed.

  • When the clash checking is finished, the Clash Check Manager status bar shows another progress bar that indicates how long it will take to add all the clashes to the list of clashes. This is useful especially when there are many clashes. When the listing is complete, the status bar message changes to Ready.

Reference model types

The improved clash check is used when the clash check contains reference model objects or native Tekla Structures pours. The improvements support IFCfile format commonly used in BIM that facilitates software interoperability

IFC is an open specification developed by the IAI (International Alliance for Interoperability).

Model can be exported into an IFC file.

/IFC4 and .tekla reference models (overlay models excluded), and reference models inserted using a base pointpoint in a model that is used to define a starting point in surveying and that is used as an anchor point in coordinate and height transformations

A Tekla Structures project can have several base points but only one of them can be the project base point.

Base points allow the use of another coordinate system needed for interoperability and collaboration. Base points can also be used in drawings, and in reports and templates. Model origin is the default base point in Tekla Structures.

Base points are also called control points.

. Other reference model formats such as DGN, DWG, and SKP can also be used in the clash check, as before.


  • Clashes are not detected if the profiles and positions are identical.

  • Selecting a native Tekla Structures or a reference model assembly with the Select assemblies selection switchswitch used for controlling which object types can be selected

    does not have clash check in the context menu. You can check the selected assemblies in Clash Check Manager by clicking .

  • Zooming to selected and highlighting clashing objects cannot be used when there is only one clash in the list of clashes. To zoom and highlight, right-click the clash in the list and select Clash Information.

  • Reference model scale is not taken into account if the scale < 1.

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