# Coordinate system

# Coordinate system

Tekla Structures uses two coordinate systems: the global and the local coordinate systemcoordinate system that reflects the current work plane or drawing view plane

The local coordinate system is represented in a model by a symbol with three axes (x, y, and z). This symbol indicates the direction of the model. It is located in the lower right corner of the model view.

In a drawing, the local coordinate system symbol has two axes.

. The local coordinate system is also known as the work planeplane that the user has chosen in a model and that is currently active for working on in a model view

Newly created, copied, or moved model objects comply with the work plane. For example, shifting the work plane to follow a sloped plane makes it easier to model sloped structures.

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## Global coordinate system

The green cube symbol represents the global coordinate systemcoordinate system that reflects the entire space of a model

A green cube represents the global coordinate system and lies at the global point of origin in the 3D view.

and lies at the global point of origincenter of the coordinate system where the axes intersect and form a fixed point of reference for the geometry of the surrounding space

(x=0, y=0, z=0). The global coordinate system is static and it cannot be changed.

Do not place the model far away from the origin. If you create model objects far away from the origin, snapping to points in the model views may become inaccurate. The further away from the origin you model, the less precise all computations become.

If you need to use another coordinate system for inserting reference models or 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, you can use base points. When you use base points, you can keep the coordinates small and locate the model wherever needed.

## Local coordinate system (Work plane)

The work plane represents the local coordinate system. Most of the commands that are dependent on the coordinate system use the work plane coordinates. For example creating points, part positioning, and copying always comply with the work plane coordinate system. The coordinate symbol, which is located in the lower right corner of the 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.

, follows the work plane.

The work plane is model specific, so it is the same in all views. The red work plane arrow symbol shows the xy plane. The z direction follows the right-hand rule.

You can change the local coordinate system by shifting the work plane. The work plane also has its own red gridmodeling aid that represents a three-dimensional complex of horizontal and vertical planes

In Tekla Structures, grids are used as an aid in locating objects in a model. The grid is shown on the view plane by dash-and-dot lines. It is also possible to show grids and grid line labels in drawings, and to modify grid properties in the drawings.

It is possible to have more than one grid in a model. For example, a large-scale grid for the entire structure, and smaller grids for some detailed sections.

, which can be used for positioning parts. You can show or hide this grid as needed.

To control which work plane or 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 currently have in use in the model, use the work plane handler toolbar.