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Grids are spatial arrays of data that are sampled at regular intervals. Grids may contain electrostatic samples of spatial regions, density samples, and other potential fields.
A grid can have a variable number of contours. Each contour has an index starting at 1 for the first contours. Additionally, every contour has an individual color and a threshold value which can be positive or negative. Drawing styles for contours, such as Solid, Mesh or Cloud, affect all contours of a given grid.
The grid threshold may be manipulated in the Contour Toolbar (see section 5.8.4) or from the Grids page of the Style Window (see Figure 5.12). At the top of the Grids page in the Display section are five buttons. Below these buttons are several contour controls, each of which consists of a value slider, a visibility control, and a color picker.
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The first three buttons display the grid as either Solid, Mesh, or Cloud respectively. The fourth button launches a dialog which provides the ability to change the grid type to one of four predefined types: Electrostatic, Regular, Difference, and Generic (see section 5.8.1). Each grid type has its own individual set of default contours and colors. The last two buttons provide the ability to add and remove contours respectively. These two buttons are disabled when the grid being operated on is an Electrostatic grid as they can only have two contours, a positive one and a negative one.
In Figure 5.12, as can be inferred from the disabled buttons, the current grid is an Electrostatic grid. It has two contours, a positive one and a negative one, but actually has three sliders to control the contour values. The first contour controls the positive contour, the second the negative, and the third is a locked slider which sets both contours to the same value but with opposite signs. The depressed green dot icon next to the color picker icon indicates that both contours are Visible (see section 3.1.2).
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