Grid and Work Plane
Grid points are useful when defining objects graphically.
To open the settings of the grid, select Grid and Work Plane on the Tools menu.
Alternatively, use the 
toolbar button.
The Work Plane can be parallel with one of the three global planes: XY, YZ, or XZ (the selection is also possible by means of the toolbar buttons, i.e. without opening this dialog box).
By default, the Grid Origin is located in the zero point.
Use the 
button to select a different point in the work window, or enter its coordinates.
With the 
button, you can define a new reference point.
In the sections below, specific options are available for you to adjust the Grid Type (cartesian or polar arrangement), Number of Grid Points and Grid Point Spacing, for example.