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Using a grid |
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When working with a graphic document or a sketch of operation, it is often convenient to enable the grid on the screen and set a snap to its nodes. In this case, the cursor moved by the mouse will begin to move not smoothly, but discretely along the grid nodes. Such operation mode can be compared to drawing an image on a sheet of graph paper.
The grid is not a part of the document and is not printed on paper.
The grid may look differently in different windows even if these are windows of the same document. It is possible to set up various grid spacings over the axes, to render the grid with nodes, and to assign the coordinate system rotated relative to the current one and non-rectangular (distorted) grid.
To enable the grid display mode in the graphic area, use the Grid 
command.
The command button serves as an indicator of the grid display in the graphic area — when pressed it means that the grid is enabled, the released button means it is disabled.
To change the grid rendering options (spacing, appearance, color, etc.), use the Grid settings dialog.
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When working in a sketch mode, the grid is displayed on the screen if the angle between the sketch plane and the screen plane is less than 45 degrees. If the model is displayed in the perspective projection, the grid is displayed only if the sketch plane and the screen plane are parallel. To set such orientation of the sketch plane, use command Normal to... |
The presence of the grid on the screen does not mean that the cursor is snapping to its points. The required snap option is enabled separately.
The opposite is also true: the grid image in the graphics area can be turned off, but this does not prevent the grid snap from being performed.
Global grid snapping (like any other global snapping) is only effective in the document in which it was enabled.
If you do not need permanent grid snapping, disable global grid snapping. In this case, you can snap the cursor to a grid node by enabling local snapping.
If the grid image in the graphics area is enabled, each time you change the display scale, the system will take this change into account when redrawing the grid. When the scale becomes so fine that a grid with a given spacing cannot be drawn correctly due to its density, a sparse grid is displayed.
The grid density limit is determined by the value set as the Minimum distance between points in the grid settings dialog box. As long as the number of pixels between points is greater than the minimum, the grid is not sparse. If you further reduce the scale, the grid is sparse.
The grid is sparse by the sparse step. If the multiplicity From row was set in the Grid parameters settings dialog box, then the grid point spacing will be a multiple of the numbers from the row 2, 5, 10, 20, 50, 100, 200, 500, 1000, 2000, 5000, 10000, 20000, 50000, 100000, 500000. This means that if you set the display scale so that every point is not displayed correctly, every second grid point will be shown on the screen; if the scale is further reduced, every fifth, then every tenth, and so on.
If you have set the Multiple cutting step, the grid point spacing will be a constant multiple of the specified number. For example, specifying a multiple of 2 means that when you zoom out, the screen will first show every second grid point, then every fourth, then every sixth, and so on.
