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Define project base points for IFC export and reference model import

Last updated April 4, 2017 by Tekla User Assistance tekla.documentation@trimble.com

Software version: 
2017

Define project base points for IFC export and reference model import

Define project base points for IFC export and reference model import

The base points allow you to use another coordinate system needed for interoperability and collaboration. You can use another coordinate system for inserting reference models and exporting 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.

models. When you use base points, you can keep the coordinates small and locate the model wherever needed. You can create as many base points as you need.

Note the following:

  • 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.

    should not have any additional lines to the origin.
  • Reference models should not include objects that are very far from each other because otherwise using the model may get difficult.
  • Tekla Structures native objects including reference models should not be inserted very far from the Tekla Structures model originglobal coordinate system point of origin used for the model

    Model origin is the default project base point.

    .

Define a base point

You can define base points in Project properties. To create 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.

, you need to know the coordinates of the reference model that you are importing, or the coordinates that you want to use in IFC export.

  1. Open a Tekla Structures model where you want to add a base point.
  2. Click File > Project properties > Base points to open the Base point dialog box.
  3. Fill in the needed information:

    Name , Description Enter a name and a description for the base point.
    Coordinate system Enter the name of the coordinate system you are using.
    East coordinate (E) Enter the East coordinate (E) that represents the corresponding X coordinate point in the other coordinate system.
    North coordinate (N) Enter the North coordinate (N) that represents the corresponding Y coordinate point in the other coordinate system.
    Elevation Enter the Elevation that represents the corresponding Z coordinate point in the other coordinate system.
    Latitude , Longitude

    Enter the Latitude and Longitude of the base point to be used in the IFC export.

    Latitude and Longitude is additional information, which some software can use. In the IFC file this is written to IFCSITE information.

    If the total number of digits in Longitude is more than 15, the value is rounded up to the nearest if it is > 99.999999999999999999.

    To convert Latitude and Longitude information between decimal format and degree/minute/second (DMS) format, see Convert Latitude/Longitude to decimal.

    Location in the model Pick or enter a location for the base point in the Tekla Structures model.
    Angle to North Pick or enter the Angle to North , which is the angle between Y and North. Angle to North is 0 if North is equal to Y in the other coordinate system. The maximum number of decimals for the angle is 13.
  4. Click Modify to save the base point.

    A blue symbol is added in the model.

    If you later on make changes to the base point, the base point location in the model changes according to the location or rotation changes you make in the Base point dialog box when you press Enter or click another input field, and there is no need to click Modify.

    Now you can insert a reference model, or export an IFC model using the defined base point.

Insert a reference model using a base point

Before you can insert a reference at the base points, you need to create a base point in your model. To create the base point, you need to know the coordinates of the reference model that you are importing.

  1. Open the Reference Models list by clicking the Reference Models button in the side pane.
  2. In the Reference Models list, click the Add model button.
  3. In the Add model dialog box, if you have any previously created reference model properties files, load the desired file by selecting the file from the properties file list at the top.
  4. Browse for the reference model by clicking Browse.
  5. In Group , select a group for the reference model, or enter a name for a new group.

    If you do not enter a name for the group, the reference model is inserted in the Default group.

  6. In Location by , select the base point you want to use.
  7. Click the Add model button. Tekla Structures inserts the reference model relative to the selected base point by using the coordinate system values, elevation and angle in the base point definition in the model Project properties.

Export an IFC model using a base point

Before you can export an IFC file using a base point, you need to create a base point in your model.

  1. Click File > Export > IFC to open the Export to IFC dialog box.
  2. In Location by , select a base point that you have created.
  3. Fill in other necessary IFC export information.
  4. Click Export. The base point option exports the IFC model relative to the base point using the coordinate system values, elevation, latitude, longitude and angle in the base point definition in the model Project properties.

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