Casting direction

Last updated March 10, 2020 by Tekla User Assistance

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Casting direction

Casting direction

To indicate the casting direction of a concrete part, you can define which part face you want to face upwards in the casting form. The top-in-form face is displayed in the front viewdefault view that is created using the part’s or component’s coordinate system and that shows the part or component from the front direction

Part’s front view is a view on part plane created of the part’s front plane.

of a drawing.

Casting direction for concrete and non-concrete parts

To enable this featurepart of Tekla Structures functionality that is maintained and owned by Trimble Solutions and that is included in the Tekla Structures installation

for non-concrete parts as well, and to indicate in the model the part face that is shown in the drawing main (front) view, use the advanced option XS_SET_​FIXEDMAINVIEW​_UDA_TO_​AFFECT_​NUMBERING.

The casting direction affects the numberingprocess of assigning position numbers to parts, cast units, assemblies, or reinforcement

In Tekla Structures, the position numbers assigned in the numbering are shown in marks and templates, for example.

of parts. If you define the casting direction for parts that differ only by their modeling direction, they get different position numbers. This is because the modeling direction affects the top-in-form face of the parts. By default, the casting direction of the parts is undefined, which means the modeling direction does not affect numbering.


In drawings, use the Fixed coordinate system to show the top-in-form face in the front view.


In the following example, each cast unit gets a different position numberidentifier that is assigned to all similar parts, assemblies, cast units, or reinforcement

Position number consists of a prefix, separator, and running number. The prefix is part of the position number, identifying a numbering series. The running number is part of the position number, and is the assigned number in the numbering series, based on the start number. The separator is an optional character, such as a slash, that separates the prefix and the running number.

In Tekla Structures, the position numbers assigned in the numbering are shown in marks and templates, for example.

In the US, the term piece mark or ship mark is used to refer to a position number.

, because the top-in-form setting and the orientation of the panels is different. The red arrow indicates the modeling direction.

In the following example, the cast units get the same position number, because their top-in-form setting has not been defined. The red arrow indicates the modeling direction.

Define the casting direction of a part

You can define the casting direction for concrete parts.

  1. Set the renderingprocess of making the model object faces visible

    The rendered model object faces can be transparent or non-transparent

    of parts to Rendered by doing one of the following:

    • On the View tab, click Rendering > Parts rendered .

    • Press Ctrl + 4.

  2. Select a concrete part.
  3. Right-click and select Cast Unit > Set Top in Form Face .
  4. Select the part face that will face upwards in the form.

Alternatively, you can do this in the user-defined attributes of the part.

  • Concrete parts: Select an option for the Top in form face user-defined attributeobject property created by the user in order to widen the range of predefined object properties

    User-defined attributes are used when the predefined object properties are not sufficient but more properties are needed. For example, comment, locked, and erection status are user-defined attributes.


  • Non-concrete parts: With XS_SET_​FIXEDMAINVIEW​_UDA_TO_​AFFECT_​NUMBERING set to STEEL, TIMBER, and/or MISC, select an option for the Fixed drawing main view user-defined attribute.

Show the top-in-form face

You can display the top-in-form face of a concrete part in a model viewview that is represented in the modeling mode

Model view is available also in the drawing mode and it is represented in its own window.


  1. On the Concrete tab, click Cast unit > Show top-in-form face .
  2. Click the concrete part whose top-in-form face you want to show.

    Tekla Structures highlights the top-in-form face in red:


To hide the top-in-form face again, right-click the view and select Update Window.

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