Exploring Data in Three Dimensions
This section describes the property tabs that are associated with a rotating plot. To access the rotating plot properties, right-click near the center of a plot, and select from the pop-up menu.
Tabs not discussed in this chapter are discussed in Chapter 9: General Plot Properties.
The Surface tab controls attributes of the rotating plot. (See Figure 7.4.) You can use the Surface tab to control the placement of axes, the type of surface that is drawn, and whether contours of the data are shown in the (X,Y) plane. The Surface tab contains the following UI controls:
- Axis Locations
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specifies the location of axes.- At midpoint
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specifies that the origin of each axis is placed at the midpoint of the range of the variable for that axis.
- At minima
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specifies that the origin of each axis is placed at the minimum value of the variable for that axis.
- 3 sections
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specifies that each axis is placed on an edge of the bounding cube that surrounds the data so that the axis interferes as little as possible with viewing the data.
- Off
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specifies that no axes are displayed.
- Surface Drawing Modes
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specifies the attributes of the surface that is added to the rotating plot.- Transparent mesh
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specifies that the surface is drawn as a wire mesh without removing hidden lines.
- Opaque mesh
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specifies that the surface is drawn as a wire mesh and hidden lines are removed.
- Block color mesh
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specifies that the surface is drawn as a patch of rectangles in which each rectangle is a single color.
- Smooth color mesh
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specifies that the surface is drawn as a patch of triangles in which each triangle is a single color.
- Stacked contours
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specifies that the surface is not drawn, but that contour levels are drawn.
- Stacked contours mesh
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specifies that the surface is drawn as for the option and also that contour levels are added as for the option.
- Off
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specifies that no surface is displayed.
- Contour Projections
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specifies whether contours of the data are shown in the (X,Y) plane.- Show contour lines
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specifies that contours for the surface are shown projected onto the (X,Y) plane.
- Show contour areas
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specifies that region between projected contours are filled with color.
- Show contour values
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specifies whether projected contour lines are labeled by the value of the Z axis variable.
The Contours tab controls attributes of the projected contours for the surface. The Contours tab is described in the section Contour Plot Properties.
The Grid tab controls the size and color of the grid used to construct a surface and to compute contours for the surface. (See Figure 7.12.) The Grid tab contains the following UI controls:
- Show grid
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specifies whether to display a grid on the displayed surface. - Colors
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specifies the color of the grid when seen from the front (positive Z direction) or back (negative Z direction). - Resolution
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specifies the resolution of the computational grid used to fit a surface to the data. The algorithm that computes the surface uses a grid superimposed on the (X,Y) plane. This grid consists of evenly spaced subdivisions along the X and Y axes. Generally, having more subdivisions results in a smoother surface, whereas having fewer subdivisions results in a rougher surface.
The Observations tab controls the attributes of markers in the rotating plot. (See Figure 7.5.)
The Observations tab for the rotating plot contains all the controls documented in the section Scatter Plot Properties. In addition, the Observations tab for the rotating plot includes the following check boxes:
- Show rays
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specifies whether lines are drawn from the center of the bounding cube to each observation marker. - Show depth perception
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specifies whether observation markers are drawn in varying sizes to indicate their distance from the viewer.
The Reference Lines tab controls the attributes of reference lines in the rotating plot. (See Figure 7.6.)
The Reference Lines tab for the rotating plot contains all the controls documented in the section Reference Lines Tab. In addition, the Reference Lines tab for the rotating plot includes the following check box:
- Show Z reference lines
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specifies whether to show reference lines for the Z axis.
The Plot Area tab controls the attributes of plot area in the rotating plot. (See Figure 7.7.) The Plot Area tab contains the following UI controls:
- Background
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specifies the color of the background of the plot area. - Show plot frame box
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specifies whether to display a framing box surrounding the plot area.