# 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.

.

## 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). 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.

## 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 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.

You can change the local coordinate system by shifting the work plane. The work plane also has its own 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.

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.