Many functions inside GiD need points to be defined by the user. Points are the lowest level of geometrical entity and therefore the most commonly used. Consequently, it is important that you have a thorough understanding of how to do this. Sometimes an existing point is required and sometimes a new point must be defined. 
All the options explained in this section are available through the window shown above (see Coordinates window (only Preprocessing)). This window is accessed via the pull-down menu Utilities -> Tools. Here you can choose not only the kind of reference system - cartesian, cylindrical or spherical - but also whether to use a global or local coordinate system and whether the origin of coordinates is fixed or relative (where new coordinates are relative to the last origin point entered).
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The x,y,z coordinates must be written in the command line sepating separating them by comma or spaces (but not both). If z is omited omitted it is assumed as z=0.0
- Selecting an existing point.
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