Grid makes creation of model vertices and edges easier and helps to check correctness of the model. To change the grid, choose Grid Settings in the Edit or context menu and change the dialog fields described below according to your needs.
The Show Grid option allows to switch grid visibility on and off.
The Snap to Grid option allows to switch grid attraction on and off. When attraction is on new vertices can appear either at intersection points of model edges or at grid nodes. This makes model description faster and results in more consistent models.
The Grid Spacing field defines the sizes of the grid cell. To define different horizontal and vertical sizes, first check the Anisotropic box.
The Anisotropic option allows to define the grid cell with different horizontal and vertical sizes.
The Scale with Zoom option allows to switch between different policies related to changing grid cell sizes with zoom.
When the option is on (default) the grid cell sizes retain approximately the same values in screen coordinates.
When the option is off the grid cell sizes retain the same values in length units defined for the model.
The Grid Origin field defines the coordinates of one of grid nodes. This allows to create vertices at even distances from the point with such coordinates.