Improved reference model clash check

Tekla Structures
Tekla Structures

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 model objects.

The settings you select in the Clash Check Manager dialog box determine what is included in the clash check. The settings have related advanced options 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 or to native Tekla Structures parts 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 clearance from structures to ensure the needed space requirement for piping insulation or supports.

  • Between parts

    Clashes between native Tekla Structures parts 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 IFC/IFC4 and .tekla reference models (overlay models excluded), and reference models inserted using a base point. 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 switch 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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